Diffstat (limited to 'vendor/rails/activerecord/lib/active_record/associations.rb') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | vendor/rails/activerecord/lib/active_record/associations.rb | 1769 |
1 files changed, 0 insertions, 1769 deletions
diff --git a/vendor/rails/activerecord/lib/active_record/associations.rb b/vendor/rails/activerecord/lib/active_record/associations.rb deleted file mode 100644 index 434612f..0000000 --- a/vendor/rails/activerecord/lib/active_record/associations.rb +++ b/dev/null @@ -1,1769 +0,0 @@ -require 'active_record/associations/association_proxy' -require 'active_record/associations/association_collection' -require 'active_record/associations/belongs_to_association' -require 'active_record/associations/belongs_to_polymorphic_association' -require 'active_record/associations/has_one_association' -require 'active_record/associations/has_many_association' -require 'active_record/associations/has_many_through_association' -require 'active_record/associations/has_and_belongs_to_many_association' - -module ActiveRecord - class HasManyThroughAssociationNotFoundError < ActiveRecordError #:nodoc: - def initialize(owner_class_name, reflection) - super("Could not find the association #{reflection.options[:through].inspect} in model #{owner_class_name}") - end - end - - class HasManyThroughAssociationPolymorphicError < ActiveRecordError #:nodoc: - def initialize(owner_class_name, reflection, source_reflection) - super("Cannot have a has_many :through association '#{owner_class_name}##{reflection.name}' on the polymorphic object '#{source_reflection.class_name}##{source_reflection.name}'.") - end - end - - class HasManyThroughAssociationPointlessSourceTypeError < ActiveRecordError #:nodoc: - def initialize(owner_class_name, reflection, source_reflection) - super("Cannot have a has_many :through association '#{owner_class_name}##{reflection.name}' with a :source_type option if the '#{reflection.through_reflection.class_name}##{source_reflection.name}' is not polymorphic. Try removing :source_type on your association.") - end - end - - class HasManyThroughSourceAssociationNotFoundError < ActiveRecordError #:nodoc: - def initialize(reflection) - through_reflection = reflection.through_reflection - source_reflection_names = reflection.source_reflection_names - source_associations = reflection.through_reflection.klass.reflect_on_all_associations.collect { |a| a.name.inspect } - super("Could not find the source association(s) #{source_reflection_names.collect(&:inspect).to_sentence :connector => 'or'} in model #{through_reflection.klass}. Try 'has_many #{reflection.name.inspect}, :through => #{through_reflection.name.inspect}, :source => <name>'. Is it one of #{source_associations.to_sentence :connector => 'or'}?") - end - end - - class HasManyThroughSourceAssociationMacroError < ActiveRecordError #:nodoc: - def initialize(reflection) - through_reflection = reflection.through_reflection - source_reflection = reflection.source_reflection - super("Invalid source reflection macro :#{source_reflection.macro}#{" :through" if source_reflection.options[:through]} for has_many #{reflection.name.inspect}, :through => #{through_reflection.name.inspect}. Use :source to specify the source reflection.") - end - end - - class HasManyThroughCantAssociateNewRecords < ActiveRecordError #:nodoc: - def initialize(owner, reflection) - super("Cannot associate new records through '#{owner.class.name}##{reflection.name}' on '#{reflection.source_reflection.class_name rescue nil}##{reflection.source_reflection.name rescue nil}'. Both records must have an id in order to create the has_many :through record associating them.") - end - end - - class HasManyThroughCantDissociateNewRecords < ActiveRecordError #:nodoc: - def initialize(owner, reflection) - super("Cannot dissociate new records through '#{owner.class.name}##{reflection.name}' on '#{reflection.source_reflection.class_name rescue nil}##{reflection.source_reflection.name rescue nil}'. Both records must have an id in order to delete the has_many :through record associating them.") - end - end - - class EagerLoadPolymorphicError < ActiveRecordError #:nodoc: - def initialize(reflection) - super("Can not eagerly load the polymorphic association #{reflection.name.inspect}") - end - end - - class ReadOnlyAssociation < ActiveRecordError #:nodoc: - def initialize(reflection) - super("Can not add to a has_many :through association. Try adding to #{reflection.through_reflection.name.inspect}.") - end - end - - module Associations # :nodoc: - def self.included(base) - base.extend(ClassMethods) - end - - # Clears out the association cache - def clear_association_cache #:nodoc: - self.class.reflect_on_all_associations.to_a.each do |assoc| - instance_variable_set "@#{assoc.name}", nil - end unless self.new_record? - end - - # Associations are a set of macro-like class methods for tying objects together through foreign keys. They express relationships like - # "Project has one Project Manager" or "Project belongs to a Portfolio". Each macro adds a number of methods to the class which are - # specialized according to the collection or association symbol and the options hash. It works much the same way as Ruby's own <tt>attr*</tt> - # methods. Example: - # - # class Project < ActiveRecord::Base - # belongs_to :portfolio - # has_one :project_manager - # has_many :milestones - # has_and_belongs_to_many :categories - # end - # - # The project class now has the following methods (and more) to ease the traversal and manipulation of its relationships: - # * <tt>Project#portfolio, Project#portfolio=(portfolio), Project#portfolio.nil?</tt> - # * <tt>Project#project_manager, Project#project_manager=(project_manager), Project#project_manager.nil?,</tt> - # * <tt>Project#milestones.empty?, Project#milestones.size, Project#milestones, Project#milestones<<(milestone),</tt> - # <tt>Project#milestones.delete(milestone), Project#milestones.find(milestone_id), Project#milestones.find(:all, options),</tt> - # <tt>Project#milestones.build, Project#milestones.create</tt> - # * <tt>Project#categories.empty?, Project#categories.size, Project#categories, Project#categories<<(category1),</tt> - # <tt>Project#categories.delete(category1)</tt> - # - # === A word of warning - # - # Don't create associations that have the same name as instance methods of ActiveRecord::Base. Since the association - # adds a method with that name to its model, it will override the inherited method and break things. - # For instance, #attributes and #connection would be bad choices for association names. - # - # == Auto-generated methods - # - # ===Singular associations (one-to-one) - # | | belongs_to | - # generated methods | belongs_to | :polymorphic | has_one - # ----------------------------------+------------+--------------+--------- - # #other | X | X | X - # #other=(other) | X | X | X - # #build_other(attributes={}) | X | | X - # #create_other(attributes={}) | X | | X - # #other.create!(attributes={}) | | | X - # #other.nil? | X | X | - # - # ===Collection associations (one-to-many / many-to-many) - # | | | has_many - # generated methods | habtm | has_many | :through - # ----------------------------------+-------+----------+---------- - # #others | X | X | X - # #others=(other,other,...) | X | X | - # #other_ids | X | X | X - # #other_ids=(id,id,...) | X | X | - # #others<< | X | X | X - # #others.push | X | X | X - # #others.concat | X | X | X - # #others.build(attributes={}) | X | X | X - # #others.create(attributes={}) | X | X | - # #others.create!(attributes={}) | X | X | X - # #others.size | X | X | X - # #others.length | X | X | X - # #others.count | | X | X - # #others.sum(args*,&block) | X | X | X - # #others.empty? | X | X | X - # #others.clear | X | X | - # #others.delete(other,other,...) | X | X | X - # #others.delete_all | X | X | - # #others.destroy_all | X | X | X - # #others.find(*args) | X | X | X - # #others.find_first | X | | - # #others.uniq | X | X | - # #others.reset | X | X | X - # - # == Cardinality and associations - # - # ActiveRecord associations can be used to describe relations with one-to-one, one-to-many - # and many-to-many cardinality. Each model uses an association to describe its role in - # the relation. In each case, the +belongs_to+ association is used in the model that has - # the foreign key. - # - # === One-to-one - # - # Use +has_one+ in the base, and +belongs_to+ in the associated model. - # - # class Employee < ActiveRecord::Base - # has_one :office - # end - # class Office < ActiveRecord::Base - # belongs_to :employee # foreign key - employee_id - # end - # - # === One-to-many - # - # Use +has_many+ in the base, and +belongs_to+ in the associated model. - # - # class Manager < ActiveRecord::Base - # has_many :employees - # end - # class Employee < ActiveRecord::Base - # belongs_to :manager # foreign key - manager_id - # end - # - # === Many-to-many - # - # There are two ways to build a many-to-many relationship. - # - # The first way uses a +has_many+ association with the <tt>:through</tt> option and a join model, so - # there are two stages of associations. - # - # class Assignment < ActiveRecord::Base - # belongs_to :programmer # foreign key - programmer_id - # belongs_to :project # foreign key - project_id - # end - # class Programmer < ActiveRecord::Base - # has_many :assignments - # has_many :projects, :through => :assignments - # end - # class Project < ActiveRecord::Base - # has_many :assignments - # has_many :programmers, :through => :assignments - # end - # - # For the second way, use +has_and_belongs_to_many+ in both models. This requires a join table - # that has no corresponding model or primary key. - # - # class Programmer < ActiveRecord::Base - # has_and_belongs_to_many :projects # foreign keys in the join table - # end - # class Project < ActiveRecord::Base - # has_and_belongs_to_many :programmers # foreign keys in the join table - # end - # - # Choosing which way to build a many-to-many relationship is not always simple. - # If you need to work with the relationship model as its own entity, - # use <tt>has_many :through</tt>. Use +has_and_belongs_to_many+ when working with legacy schemas or when - # you never work directly with the relationship itself. - # - # == Is it a +belongs_to+ or +has_one+ association? - # - # Both express a 1-1 relationship. The difference is mostly where to place the foreign key, which goes on the table for the class - # declaring the +belongs_to+ relationship. Example: - # - # class User < ActiveRecord::Base - # # I reference an account. - # belongs_to :account - # end - # - # class Account < ActiveRecord::Base - # # One user references me. - # has_one :user - # end - # - # The tables for these classes could look something like: - # - # CREATE TABLE users ( - # id int(11) NOT NULL auto_increment, - # account_id int(11) default NULL, - # name varchar default NULL, - # PRIMARY KEY (id) - # ) - # - # CREATE TABLE accounts ( - # id int(11) NOT NULL auto_increment, - # name varchar default NULL, - # PRIMARY KEY (id) - # ) - # - # == Unsaved objects and associations - # - # You can manipulate objects and associations before they are saved to the database, but there is some special behavior you should be - # aware of, mostly involving the saving of associated objects. - # - # === One-to-one associations - # - # * Assigning an object to a +has_one+ association automatically saves that object and the object being replaced (if there is one), in - # order to update their primary keys - except if the parent object is unsaved (<tt>new_record? == true</tt>). - # * If either of these saves fail (due to one of the objects being invalid) the assignment statement returns +false+ and the assignment - # is cancelled. - # * If you wish to assign an object to a +has_one+ association without saving it, use the <tt>#association.build</tt> method (documented below). - # * Assigning an object to a +belongs_to+ association does not save the object, since the foreign key field belongs on the parent. It - # does not save the parent either. - # - # === Collections - # - # * Adding an object to a collection (+has_many+ or +has_and_belongs_to_many+) automatically saves that object, except if the parent object - # (the owner of the collection) is not yet stored in the database. - # * If saving any of the objects being added to a collection (via <tt>#push</tt> or similar) fails, then <tt>#push</tt> returns +false+. - # * You can add an object to a collection without automatically saving it by using the <tt>#collection.build</tt> method (documented below). - # * All unsaved (<tt>new_record? == true</tt>) members of the collection are automatically saved when the parent is saved. - # - # === Association callbacks - # - # Similar to the normal callbacks that hook into the lifecycle of an Active Record object, you can also define callbacks that get - # triggered when you add an object to or remove an object from an association collection. Example: - # - # class Project - # has_and_belongs_to_many :developers, :after_add => :evaluate_velocity - # - # def evaluate_velocity(developer) - # ... - # end - # end - # - # It's possible to stack callbacks by passing them as an array. Example: - # - # class Project - # has_and_belongs_to_many :developers, :after_add => [:evaluate_velocity, Proc.new { |p, d| p.shipping_date = Time.now}] - # end - # - # Possible callbacks are: +before_add+, +after_add+, +before_remove+ and +after_remove+. - # - # Should any of the +before_add+ callbacks throw an exception, the object does not get added to the collection. Same with - # the +before_remove+ callbacks; if an exception is thrown the object doesn't get removed. - # - # === Association extensions - # - # The proxy objects that control the access to associations can be extended through anonymous modules. This is especially - # beneficial for adding new finders, creators, and other factory-type methods that are only used as part of this association. - # Example: - # - # class Account < ActiveRecord::Base - # has_many :people do - # def find_or_create_by_name(name) - # first_name, last_name = name.split(" ", 2) - # find_or_create_by_first_name_and_last_name(first_name, last_name) - # end - # end - # end - # - # person = Account.find(:first).people.find_or_create_by_name("David Heinemeier Hansson") - # person.first_name # => "David" - # person.last_name # => "Heinemeier Hansson" - # - # If you need to share the same extensions between many associations, you can use a named extension module. Example: - # - # module FindOrCreateByNameExtension - # def find_or_create_by_name(name) - # first_name, last_name = name.split(" ", 2) - # find_or_create_by_first_name_and_last_name(first_name, last_name) - # end - # end - # - # class Account < ActiveRecord::Base - # has_many :people, :extend => FindOrCreateByNameExtension - # end - # - # class Company < ActiveRecord::Base - # has_many :people, :extend => FindOrCreateByNameExtension - # end - # - # If you need to use multiple named extension modules, you can specify an array of modules with the <tt>:extend</tt> option. - # In the case of name conflicts between methods in the modules, methods in modules later in the array supercede - # those earlier in the array. Example: - # - # class Account < ActiveRecord::Base - # has_many :people, :extend => [FindOrCreateByNameExtension, FindRecentExtension] - # end - # - # Some extensions can only be made to work with knowledge of the association proxy's internals. - # Extensions can access relevant state using accessors on the association proxy: - # - # * +proxy_owner+ - Returns the object the association is part of. - # * +proxy_reflection+ - Returns the reflection object that describes the association. - # * +proxy_target+ - Returns the associated object for +belongs_to+ and +has_one+, or the collection of associated objects for +has_many+ and +has_and_belongs_to_many+. - # - # === Association Join Models - # - # Has Many associations can be configured with the <tt>:through</tt> option to use an explicit join model to retrieve the data. This - # operates similarly to a +has_and_belongs_to_many+ association. The advantage is that you're able to add validations, - # callbacks, and extra attributes on the join model. Consider the following schema: - # - # class Author < ActiveRecord::Base - # has_many :authorships - # has_many :books, :through => :authorships - # end - # - # class Authorship < ActiveRecord::Base - # belongs_to :author - # belongs_to :book - # end - # - # @author = Author.find :first - # @author.authorships.collect { |a| a.book } # selects all books that the author's authorships belong to. - # @author.books # selects all books by using the Authorship join model - # - # You can also go through a +has_many+ association on the join model: - # - # class Firm < ActiveRecord::Base - # has_many :clients - # has_many :invoices, :through => :clients - # end - # - # class Client < ActiveRecord::Base - # belongs_to :firm - # has_many :invoices - # end - # - # class Invoice < ActiveRecord::Base - # belongs_to :client - # end - # - # @firm = Firm.find :first - # @firm.clients.collect { |c| c.invoices }.flatten # select all invoices for all clients of the firm - # @firm.invoices # selects all invoices by going through the Client join model. - # - # === Polymorphic Associations - # - # Polymorphic associations on models are not restricted on what types of models they can be associated with. Rather, they - # specify an interface that a +has_many+ association must adhere to. - # - # class Asset < ActiveRecord::Base - # belongs_to :attachable, :polymorphic => true - # end - # - # class Post < ActiveRecord::Base - # has_many :assets, :as => :attachable # The :as option specifies the polymorphic interface to use. - # end - # - # @asset.attachable = @post - # - # This works by using a type column in addition to a foreign key to specify the associated record. In the Asset example, you'd need - # an +attachable_id+ integer column and an +attachable_type+ string column. - # - # Using polymorphic associations in combination with single table inheritance (STI) is a little tricky. In order - # for the associations to work as expected, ensure that you store the base model for the STI models in the - # type column of the polymorphic association. To continue with the asset example above, suppose there are guest posts - # and member posts that use the posts table for STI. In this case, there must be a +type+ column in the posts table. - # - # class Asset < ActiveRecord::Base - # belongs_to :attachable, :polymorphic => true - # - # def attachable_type=(sType) - # super(sType.to_s.classify.constantize.base_class.to_s) - # end - # end - # - # class Post < ActiveRecord::Base - # # because we store "Post" in attachable_type now :dependent => :destroy will work - # has_many :assets, :as => :attachable, :dependent => :destroy - # end - # - # class GuestPost < Post - # end - # - # class MemberPost < Post - # end - # - # == Caching - # - # All of the methods are built on a simple caching principle that will keep the result of the last query around unless specifically - # instructed not to. The cache is even shared across methods to make it even cheaper to use the macro-added methods without - # worrying too much about performance at the first go. Example: - # - # project.milestones # fetches milestones from the database - # project.milestones.size # uses the milestone cache - # project.milestones.empty? # uses the milestone cache - # project.milestones(true).size # fetches milestones from the database - # project.milestones # uses the milestone cache - # - # == Eager loading of associations - # - # Eager loading is a way to find objects of a certain class and a number of named associations along with it in a single SQL call. This is - # one of the easiest ways of to prevent the dreaded 1+N problem in which fetching 100 posts that each need to display their author - # triggers 101 database queries. Through the use of eager loading, the 101 queries can be reduced to 1. Example: - # - # class Post < ActiveRecord::Base - # belongs_to :author - # has_many :comments - # end - # - # Consider the following loop using the class above: - # - # for post in Post.find(:all) - # puts "Post: " + post.title - # puts "Written by: " + post.author.name - # puts "Last comment on: " + post.comments.first.created_on - # end - # - # To iterate over these one hundred posts, we'll generate 201 database queries. Let's first just optimize it for retrieving the author: - # - # for post in Post.find(:all, :include => :author) - # - # This references the name of the +belongs_to+ association that also used the <tt>:author</tt> symbol, so the find will now weave in a join something - # like this: <tt>LEFT OUTER JOIN authors ON authors.id = posts.author_id</tt>. Doing so will cut down the number of queries from 201 to 101. - # - # We can improve upon the situation further by referencing both associations in the finder with: - # - # for post in Post.find(:all, :include => [ :author, :comments ]) - # - # That'll add another join along the lines of: <tt>LEFT OUTER JOIN comments ON comments.post_id = posts.id</tt>. And we'll be down to 1 query. - # - # To include a deep hierarchy of associations, use a hash: - # - # for post in Post.find(:all, :include => [ :author, { :comments => { :author => :gravatar } } ]) - # - # That'll grab not only all the comments but all their authors and gravatar pictures. You can mix and match - # symbols, arrays and hashes in any combination to describe the associations you want to load. - # - # All of this power shouldn't fool you into thinking that you can pull out huge amounts of data with no performance penalty just because you've reduced - # the number of queries. The database still needs to send all the data to Active Record and it still needs to be processed. So it's no - # catch-all for performance problems, but it's a great way to cut down on the number of queries in a situation as the one described above. - # - # Since the eager loading pulls from multiple tables, you'll have to disambiguate any column references in both conditions and orders. So - # <tt>:order => "posts.id DESC"</tt> will work while <tt>:order => "id DESC"</tt> will not. Because eager loading generates the +SELECT+ statement too, the - # <tt>:select</tt> option is ignored. - # - # You can use eager loading on multiple associations from the same table, but you cannot use those associations in orders and conditions - # as there is currently not any way to disambiguate them. Eager loading will not pull additional attributes on join tables, so "rich - # associations" with +has_and_belongs_to_many+ are not a good fit for eager loading. - # - # When eager loaded, conditions are interpolated in the context of the model class, not the model instance. Conditions are lazily interpolated - # before the actual model exists. - # - # == Table Aliasing - # - # ActiveRecord uses table aliasing in the case that a table is referenced multiple times in a join. If a table is referenced only once, - # the standard table name is used. The second time, the table is aliased as <tt>#{reflection_name}_#{parent_table_name}</tt>. Indexes are appended - # for any more successive uses of the table name. - # - # Post.find :all, :include => :comments - # # => SELECT ... FROM posts LEFT OUTER JOIN comments ON ... - # Post.find :all, :include => :special_comments # STI - # # => SELECT ... FROM posts LEFT OUTER JOIN comments ON ... AND comments.type = 'SpecialComment' - # Post.find :all, :include => [:comments, :special_comments] # special_comments is the reflection name, posts is the parent table name - # # => SELECT ... FROM posts LEFT OUTER JOIN comments ON ... LEFT OUTER JOIN comments special_comments_posts - # - # Acts as tree example: - # - # TreeMixin.find :all, :include => :children - # # => SELECT ... FROM mixins LEFT OUTER JOIN mixins childrens_mixins ... - # TreeMixin.find :all, :include => {:children => :parent} # using cascading eager includes - # # => SELECT ... FROM mixins LEFT OUTER JOIN mixins childrens_mixins ... - # LEFT OUTER JOIN parents_mixins ... - # TreeMixin.find :all, :include => {:children => {:parent => :children}} - # # => SELECT ... FROM mixins LEFT OUTER JOIN mixins childrens_mixins ... - # LEFT OUTER JOIN parents_mixins ... - # LEFT OUTER JOIN mixins childrens_mixins_2 - # - # Has and Belongs to Many join tables use the same idea, but add a <tt>_join</tt> suffix: - # - # Post.find :all, :include => :categories - # # => SELECT ... FROM posts LEFT OUTER JOIN categories_posts ... LEFT OUTER JOIN categories ... - # Post.find :all, :include => {:categories => :posts} - # # => SELECT ... FROM posts LEFT OUTER JOIN categories_posts ... LEFT OUTER JOIN categories ... - # LEFT OUTER JOIN categories_posts posts_categories_join LEFT OUTER JOIN posts posts_categories - # Post.find :all, :include => {:categories => {:posts => :categories}} - # # => SELECT ... FROM posts LEFT OUTER JOIN categories_posts ... LEFT OUTER JOIN categories ... - # LEFT OUTER JOIN categories_posts posts_categories_join LEFT OUTER JOIN posts posts_categories - # LEFT OUTER JOIN categories_posts categories_posts_join LEFT OUTER JOIN categories categories_posts - # - # If you wish to specify your own custom joins using a <tt>:joins</tt> option, those table names will take precedence over the eager associations: - # - # Post.find :all, :include => :comments, :joins => "inner join comments ..." - # # => SELECT ... FROM posts LEFT OUTER JOIN comments_posts ON ... INNER JOIN comments ... - # Post.find :all, :include => [:comments, :special_comments], :joins => "inner join comments ..." - # # => SELECT ... FROM posts LEFT OUTER JOIN comments comments_posts ON ... - # LEFT OUTER JOIN comments special_comments_posts ... - # INNER JOIN comments ... - # - # Table aliases are automatically truncated according to the maximum length of table identifiers according to the specific database. - # - # == Modules - # - # By default, associations will look for objects within the current module scope. Consider: - # - # module MyApplication - # module Business - # class Firm < ActiveRecord::Base - # has_many :clients - # end - # - # class Company < ActiveRecord::Base; end - # end - # end - # - # When <tt>Firm#clients</tt> is called, it will in turn call <tt>MyApplication::Business::Company.find(firm.id)</tt>. If you want to associate - # with a class in another module scope, this can be done by specifying the complete class name. Example: - # - # module MyApplication - # module Business - # class Firm < ActiveRecord::Base; end - # end - # - # module Billing - # class Account < ActiveRecord::Base - # belongs_to :firm, :class_name => "MyApplication::Business::Firm" - # end - # end - # end - # - # == Type safety with <tt>ActiveRecord::AssociationTypeMismatch</tt> - # - # If you attempt to assign an object to an association that doesn't match the inferred or specified <tt>:class_name</tt>, you'll - # get an <tt>ActiveRecord::AssociationTypeMismatch</tt>. - # - # == Options - # - # All of the association macros can be specialized through options. This makes cases more complex than the simple and guessable ones - # possible. - module ClassMethods - # Adds the following methods for retrieval and query of collections of associated objects: - # +collection+ is replaced with the symbol passed as the first argument, so - # <tt>has_many :clients</tt> would add among others <tt>clients.empty?</tt>. - # * <tt>collection(force_reload = false)</tt> - returns an array of all the associated objects. - # An empty array is returned if none are found. - # * <tt>collection<<(object, ...)</tt> - adds one or more objects to the collection by setting their foreign keys to the collection's primary key. - # * <tt>collection.delete(object, ...)</tt> - removes one or more objects from the collection by setting their foreign keys to NULL. - # This will also destroy the objects if they're declared as +belongs_to+ and dependent on this model. - # * <tt>collection=objects</tt> - replaces the collections content by deleting and adding objects as appropriate. - # * <tt>collection_singular_ids</tt> - returns an array of the associated objects' ids - # * <tt>collection_singular_ids=ids</tt> - replace the collection with the objects identified by the primary keys in +ids+ - # * <tt>collection.clear</tt> - removes every object from the collection. This destroys the associated objects if they - # are associated with <tt>:dependent => :destroy</tt>, deletes them directly from the database if <tt>:dependent => :delete_all</tt>, - # otherwise sets their foreign keys to NULL. - # * <tt>collection.empty?</tt> - returns +true+ if there are no associated objects. - # * <tt>collection.size</tt> - returns the number of associated objects. - # * <tt>collection.find</tt> - finds an associated object according to the same rules as Base.find. - # * <tt>collection.build(attributes = {}, ...)</tt> - returns one or more new objects of the collection type that have been instantiated - # with +attributes+ and linked to this object through a foreign key, but have not yet been saved. *Note:* This only works if an - # associated object already exists, not if it's +nil+! - # * <tt>collection.create(attributes = {})</tt> - returns a new object of the collection type that has been instantiated - # with +attributes+, linked to this object through a foreign key, and that has already been saved (if it passed the validation). - # *Note:* This only works if an associated object already exists, not if it's +nil+! - # - # Example: A +Firm+ class declares <tt>has_many :clients</tt>, which will add: - # * <tt>Firm#clients</tt> (similar to <tt>Clients.find :all, :conditions => "firm_id = #{id}"</tt>) - # * <tt>Firm#clients<<</tt> - # * <tt>Firm#clients.delete</tt> - # * <tt>Firm#clients=</tt> - # * <tt>Firm#client_ids</tt> - # * <tt>Firm#client_ids=</tt> - # * <tt>Firm#clients.clear</tt> - # * <tt>Firm#clients.empty?</tt> (similar to <tt>firm.clients.size == 0</tt>) - # * <tt>Firm#clients.size</tt> (similar to <tt>Client.count "firm_id = #{id}"</tt>) - # * <tt>Firm#clients.find</tt> (similar to <tt>Client.find(id, :conditions => "firm_id = #{id}")</tt>) - # * <tt>Firm#clients.build</tt> (similar to <tt>Client.new("firm_id" => id)</tt>) - # * <tt>Firm#clients.create</tt> (similar to <tt>c = Client.new("firm_id" => id); c.save; c</tt>) - # The declaration can also include an options hash to specialize the behavior of the association. - # - # Options are: - # * <tt>:class_name</tt> - specify the class name of the association. Use it only if that name can't be inferred - # from the association name. So <tt>has_many :products</tt> will by default be linked to the +Product+ class, but - # if the real class name is +SpecialProduct+, you'll have to specify it with this option. - # * <tt>:conditions</tt> - specify the conditions that the associated objects must meet in order to be included as a +WHERE+ - # SQL fragment, such as <tt>price > 5 AND name LIKE 'B%'</tt>. - # * <tt>:order</tt> - specify the order in which the associated objects are returned as an <tt>ORDER BY</tt> SQL fragment, - # such as <tt>last_name, first_name DESC</tt> - # * <tt>:foreign_key</tt> - specify the foreign key used for the association. By default this is guessed to be the name - # of this class in lower-case and +_id+ suffixed. So a +Person+ class that makes a +has_many+ association will use +person_id+ - # as the default +foreign_key+. - # * <tt>:dependent</tt> - if set to <tt>:destroy</tt> all the associated objects are destroyed - # alongside this object by calling their destroy method. If set to <tt>:delete_all</tt> all associated - # objects are deleted *without* calling their destroy method. If set to <tt>:nullify</tt> all associated - # objects' foreign keys are set to +NULL+ *without* calling their save callbacks. - # * <tt>:finder_sql</tt> - specify a complete SQL statement to fetch the association. This is a good way to go for complex - # associations that depend on multiple tables. Note: When this option is used, +find_in_collection+ is _not_ added. - # * <tt>:counter_sql</tt> - specify a complete SQL statement to fetch the size of the association. If <tt>:finder_sql</tt> is - # specified but not <tt>:counter_sql</tt>, <tt>:counter_sql</tt> will be generated by replacing <tt>SELECT ... FROM</tt> with <tt>SELECT COUNT(*) FROM</tt>. - # * <tt>:extend</tt> - specify a named module for extending the proxy. See "Association extensions". - # * <tt>:include</tt> - specify second-order associations that should be eager loaded when the collection is loaded. - # * <tt>:group</tt>: An attribute name by which the result should be grouped. Uses the <tt>GROUP BY</tt> SQL-clause. - # * <tt>:limit</tt>: An integer determining the limit on the number of rows that should be returned. - # * <tt>:offset</tt>: An integer determining the offset from where the rows should be fetched. So at 5, it would skip the first 4 rows. - # * <tt>:select</tt>: By default, this is <tt>*</tt> as in <tt>SELECT * FROM</tt>, but can be changed if you, for example, want to do a join - # but not include the joined columns. - # * <tt>:as</tt>: Specifies a polymorphic interface (See <tt>#belongs_to</tt>). - # * <tt>:through</tt>: Specifies a Join Model through which to perform the query. Options for <tt>:class_name</tt> and <tt>:foreign_key</tt> - # are ignored, as the association uses the source reflection. You can only use a <tt>:through</tt> query through a <tt>belongs_to</tt> - # or <tt>has_many</tt> association on the join model. - # * <tt>:source</tt>: Specifies the source association name used by <tt>has_many :through</tt> queries. Only use it if the name cannot be - # inferred from the association. <tt>has_many :subscribers, :through => :subscriptions</tt> will look for either <tt>:subscribers</tt> or - # <tt>:subscriber</tt> on +Subscription+, unless a <tt>:source</tt> is given. - # * <tt>:source_type</tt>: Specifies type of the source association used by <tt>has_many :through</tt> queries where the source - # association is a polymorphic +belongs_to+. - # * <tt>:uniq</tt> - if set to +true+, duplicates will be omitted from the collection. Useful in conjunction with <tt>:through</tt>. - # - # Option examples: - # has_many :comments, :order => "posted_on" - # has_many :comments, :include => :author - # has_many :people, :class_name => "Person", :conditions => "deleted = 0", :order => "name" - # has_many :tracks, :order => "position", :dependent => :destroy - # has_many :comments, :dependent => :nullify - # has_many :tags, :as => :taggable - # has_many :subscribers, :through => :subscriptions, :source => :user - # has_many :subscribers, :class_name => "Person", :finder_sql => - # 'SELECT DISTINCT people.* ' + - # 'FROM people p, post_subscriptions ps ' + - # 'WHERE ps.post_id = #{id} AND ps.person_id = p.id ' + - # 'ORDER BY p.first_name' - def has_many(association_id, options = {}, &extension) - reflection = create_has_many_reflection(association_id, options, &extension) - - configure_dependency_for_has_many(reflection) - - if options[:through] - collection_reader_method(reflection, HasManyThroughAssociation) - collection_accessor_methods(reflection, HasManyThroughAssociation, false) - else - add_multiple_associated_save_callbacks(reflection.name) - add_association_callbacks(reflection.name, reflection.options) - collection_accessor_methods(reflection, HasManyAssociation) - end - end - - # Adds the following methods for retrieval and query of a single associated object: - # +association+ is replaced with the symbol passed as the first argument, so - # <tt>has_one :manager</tt> would add among others <tt>manager.nil?</tt>. - # * <tt>association(force_reload = false)</tt> - returns the associated object. +nil+ is returned if none is found. - # * <tt>association=(associate)</tt> - assigns the associate object, extracts the primary key, sets it as the foreign key, - # and saves the associate object. - # * <tt>association.nil?</tt> - returns +true+ if there is no associated object. - # * <tt>build_association(attributes = {})</tt> - returns a new object of the associated type that has been instantiated - # with +attributes+ and linked to this object through a foreign key, but has not yet been saved. Note: This ONLY works if - # an association already exists. It will NOT work if the association is +nil+. - # * <tt>create_association(attributes = {})</tt> - returns a new object of the associated type that has been instantiated - # with +attributes+, linked to this object through a foreign key, and that has already been saved (if it passed the validation). - # - # Example: An Account class declares <tt>has_one :beneficiary</tt>, which will add: - # * <tt>Account#beneficiary</tt> (similar to <tt>Beneficiary.find(:first, :conditions => "account_id = #{id}")</tt>) - # * <tt>Account#beneficiary=(beneficiary)</tt> (similar to <tt>beneficiary.account_id = account.id; beneficiary.save</tt>) - # * <tt>Account#beneficiary.nil?</tt> - # * <tt>Account#build_beneficiary</tt> (similar to <tt>Beneficiary.new("account_id" => id)</tt>) - # * <tt>Account#create_beneficiary</tt> (similar to <tt>b = Beneficiary.new("account_id" => id); b.save; b</tt>) - # - # The declaration can also include an options hash to specialize the behavior of the association. - # - # Options are: - # * <tt>:class_name</tt> - specify the class name of the association. Use it only if that name can't be inferred - # from the association name. So <tt>has_one :manager</tt> will by default be linked to the +Manager+ class, but - # if the real class name is +Person+, you'll have to specify it with this option. - # * <tt>:conditions</tt> - specify the conditions that the associated object must meet in order to be included as a +WHERE+ - # SQL fragment, such as <tt>rank = 5</tt>. - # * <tt>:order</tt> - specify the order in which the associated objects are returned as an <tt>ORDER BY</tt> SQL fragment, - # such as <tt>last_name, first_name DESC</tt> - # * <tt>:dependent</tt> - if set to <tt>:destroy</tt>, the associated object is destroyed when this object is. If set to - # <tt>:delete</tt>, the associated object is deleted *without* calling its destroy method. If set to <tt>:nullify</tt>, the associated - # object's foreign key is set to +NULL+. Also, association is assigned. - # * <tt>:foreign_key</tt> - specify the foreign key used for the association. By default this is guessed to be the name - # of this class in lower-case and +_id+ suffixed. So a +Person+ class that makes a +has_one+ association will use +person_id+ - # as the default +foreign_key+. - # * <tt>:include</tt> - specify second-order associations that should be eager loaded when this object is loaded. - # * <tt>:as</tt>: Specifies a polymorphic interface (See <tt>#belongs_to</tt>). - # - # Option examples: - # has_one :credit_card, :dependent => :destroy # destroys the associated credit card - # has_one :credit_card, :dependent => :nullify # updates the associated records foreign key value to NULL rather than destroying it - # has_one :last_comment, :class_name => "Comment", :order => "posted_on" - # has_one :project_manager, :class_name => "Person", :conditions => "role = 'project_manager'" - # has_one :attachment, :as => :attachable - def has_one(association_id, options = {}) - reflection = create_has_one_reflection(association_id, options) - - module_eval do - after_save <<-EOF - association = instance_variable_get("@#{reflection.name}") - if !association.nil? && (new_record? || association.new_record? || association["#{reflection.primary_key_name}"] != id) - association["#{reflection.primary_key_name}"] = id - association.save(true) - end - EOF - end - - association_accessor_methods(reflection, HasOneAssociation) - association_constructor_method(:build, reflection, HasOneAssociation) - association_constructor_method(:create, reflection, HasOneAssociation) - - configure_dependency_for_has_one(reflection) - end - - # Adds the following methods for retrieval and query for a single associated object for which this object holds an id: - # +association+ is replaced with the symbol passed as the first argument, so - # <tt>belongs_to :author</tt> would add among others <tt>author.nil?</tt>. - # * <tt>association(force_reload = false)</tt> - returns the associated object. +nil+ is returned if none is found. - # * <tt>association=(associate)</tt> - assigns the associate object, extracts the primary key, and sets it as the foreign key. - # * <tt>association.nil?</tt> - returns +true+ if there is no associated object. - # * <tt>build_association(attributes = {})</tt> - returns a new object of the associated type that has been instantiated - # with +attributes+ and linked to this object through a foreign key, but has not yet been saved. - # * <tt>create_association(attributes = {})</tt> - returns a new object of the associated type that has been instantiated - # with +attributes+, linked to this object through a foreign key, and that has already been saved (if it passed the validation). - # - # Example: A Post class declares <tt>belongs_to :author</tt>, which will add: - # * <tt>Post#author</tt> (similar to <tt>Author.find(author_id)</tt>) - # * <tt>Post#author=(author)</tt> (similar to <tt>post.author_id = author.id</tt>) - # * <tt>Post#author?</tt> (similar to <tt>post.author == some_author</tt>) - # * <tt>Post#author.nil?</tt> - # * <tt>Post#build_author</tt> (similar to <tt>post.author = Author.new</tt>) - # * <tt>Post#create_author</tt> (similar to <tt>post.author = Author.new; post.author.save; post.author</tt>) - # The declaration can also include an options hash to specialize the behavior of the association. - # - # Options are: - # * <tt>:class_name</tt> - specify the class name of the association. Use it only if that name can't be inferred - # from the association name. So <tt>has_one :author</tt> will by default be linked to the +Author+ class, but - # if the real class name is +Person+, you'll have to specify it with this option. - # * <tt>:conditions</tt> - specify the conditions that the associated object must meet in order to be included as a +WHERE+ - # SQL fragment, such as <tt>authorized = 1</tt>. - # * <tt>:order</tt> - specify the order in which the associated objects are returned as an <tt>ORDER BY</tt> SQL fragment, - # such as <tt>last_name, first_name DESC</tt> - # * <tt>:foreign_key</tt> - specify the foreign key used for the association. By default this is guessed to be the name - # of the associated class in lower-case and +_id+ suffixed. So a +Person+ class that makes a +belongs_to+ association to a - # +Boss+ class will use +boss_id+ as the default +foreign_key+. - # * <tt>:counter_cache</tt> - caches the number of belonging objects on the associate class through the use of +increment_counter+ - # and +decrement_counter+. The counter cache is incremented when an object of this class is created and decremented when it's - # destroyed. This requires that a column named <tt>#{table_name}_count</tt> (such as +comments_count+ for a belonging +Comment+ class) - # is used on the associate class (such as a +Post+ class). You can also specify a custom counter cache column by providing - # a column name instead of a +true+/+false+ value to this option (e.g., <tt>:counter_cache => :my_custom_counter</tt>.) - # Note: Specifying a counter_cache will add it to that model's list of readonly attributes using #attr_readonly. - # * <tt>:include</tt> - specify second-order associations that should be eager loaded when this object is loaded. - # * <tt>:polymorphic</tt> - specify this association is a polymorphic association by passing +true+. - # Note: If you've enabled the counter cache, then you may want to add the counter cache attribute - # to the attr_readonly list in the associated classes (e.g. class Post; attr_readonly :comments_count; end). - # - # Option examples: - # belongs_to :firm, :foreign_key => "client_of" - # belongs_to :author, :class_name => "Person", :foreign_key => "author_id" - # belongs_to :valid_coupon, :class_name => "Coupon", :foreign_key => "coupon_id", - # :conditions => 'discounts > #{payments_count}' - # belongs_to :attachable, :polymorphic => true - def belongs_to(association_id, options = {}) - reflection = create_belongs_to_reflection(association_id, options) - - if reflection.options[:polymorphic] - association_accessor_methods(reflection, BelongsToPolymorphicAssociation) - - module_eval do - before_save <<-EOF - association = instance_variable_get("@#{reflection.name}") - if association && association.target - if association.new_record? - association.save(true) - end - - if association.updated? - self["#{reflection.primary_key_name}"] = association.id - self["#{reflection.options[:foreign_type]}"] = association.class.base_class.name.to_s - end - end - EOF - end - else - association_accessor_methods(reflection, BelongsToAssociation) - association_constructor_method(:build, reflection, BelongsToAssociation) - association_constructor_method(:create, reflection, BelongsToAssociation) - - module_eval do - before_save <<-EOF - association = instance_variable_get("@#{reflection.name}") - if !association.nil? - if association.new_record? - association.save(true) - end - - if association.updated? - self["#{reflection.primary_key_name}"] = association.id - end - end - EOF - end - end - - # Create the callbacks to update counter cache - if options[:counter_cache] - cache_column = options[:counter_cache] == true ? - "#{self.to_s.underscore.pluralize}_count" : - options[:counter_cache] - - module_eval( - "after_create '#{reflection.name}.class.increment_counter(\"#{cache_column}\", #{reflection.primary_key_name})" + - " unless #{reflection.name}.nil?'" - ) - - module_eval( - "before_destroy '#{reflection.name}.class.decrement_counter(\"#{cache_column}\", #{reflection.primary_key_name})" + - " unless #{reflection.name}.nil?'" - ) - - module_eval( - "#{reflection.class_name}.send(:attr_readonly,\"#{cache_column}\".intern) if defined?(#{reflection.class_name}) && #{reflection.class_name}.respond_to?(:attr_readonly)" - ) - end - end - - # Associates two classes via an intermediate join table. Unless the join table is explicitly specified as - # an option, it is guessed using the lexical order of the class names. So a join between +Developer+ and +Project+ - # will give the default join table name of +developers_projects+ because "D" outranks "P". Note that this precedence - # is calculated using the <tt><</tt> operator for <tt>String</tt>. This means that if the strings are of different lengths, - # and the strings are equal when compared up to the shortest length, then the longer string is considered of higher - # lexical precedence than the shorter one. For example, one would expect the tables <tt>paper_boxes</tt> and <tt>papers</tt> - # to generate a join table name of <tt>papers_paper_boxes</tt> because of the length of the name <tt>paper_boxes</tt>, - # but it in fact generates a join table name of <tt>paper_boxes_papers</tt>. Be aware of this caveat, and use the - # custom <tt>join_table</tt> option if you need to. - # - # Deprecated: Any additional fields added to the join table will be placed as attributes when pulling records out through - # +has_and_belongs_to_many+ associations. Records returned from join tables with additional attributes will be marked as - # +ReadOnly+ (because we can't save changes to the additional attributes). It's strongly recommended that you upgrade any - # associations with attributes to a real join model (see introduction). - # - # Adds the following methods for retrieval and query: - # +collection+ is replaced with the symbol passed as the first argument, so - # <tt>has_and_belongs_to_many :categories</tt> would add among others <tt>categories.empty?</tt>. - # * <tt>collection(force_reload = false)</tt> - returns an array of all the associated objects. - # An empty array is returned if none are found. - # * <tt>collection<<(object, ...)</tt> - adds one or more objects to the collection by creating associations in the join table - # (<tt>collection.push</tt> and <tt>collection.concat</tt> are aliases to this method). - # * <tt>collection.delete(object, ...)</tt> - removes one or more objects from the collection by removing their associations from the join table. - # This does not destroy the objects. - # * <tt>collection=objects</tt> - replaces the collection's content by deleting and adding objects as appropriate. - # * <tt>collection_singular_ids</tt> - returns an array of the associated objects' ids - # * <tt>collection_singular_ids=ids</tt> - replace the collection by the objects identified by the primary keys in +ids+ - # * <tt>collection.clear</tt> - removes every object from the collection. This does not destroy the objects. - # * <tt>collection.empty?</tt> - returns +true+ if there are no associated objects. - # * <tt>collection.size</tt> - returns the number of associated objects. - # * <tt>collection.find(id)</tt> - finds an associated object responding to the +id+ and that - # meets the condition that it has to be associated with this object. - # * <tt>collection.build(attributes = {})</tt> - returns a new object of the collection type that has been instantiated - # with +attributes+ and linked to this object through the join table, but has not yet been saved. - # * <tt>collection.create(attributes = {})</tt> - returns a new object of the collection type that has been instantiated - # with +attributes+, linked to this object through the join table, and that has already been saved (if it passed the validation). - # - # Example: A Developer class declares <tt>has_and_belongs_to_many :projects</tt>, which will add: - # * <tt>Developer#projects</tt> - # * <tt>Developer#projects<<</tt> - # * <tt>Developer#projects.delete</tt> - # * <tt>Developer#projects=</tt> - # * <tt>Developer#project_ids</tt> - # * <tt>Developer#project_ids=</tt> - # * <tt>Developer#projects.clear</tt> - # * <tt>Developer#projects.empty?</tt> - # * <tt>Developer#projects.size</tt> - # * <tt>Developer#projects.find(id)</tt> - # * <tt>Developer#projects.build</tt> (similar to <tt>Project.new("project_id" => id)</tt>) - # * <tt>Developer#projects.create</tt> (similar to <tt>c = Project.new("project_id" => id); c.save; c</tt>) - # The declaration may include an options hash to specialize the behavior of the association. - # - # Options are: - # * <tt>:class_name</tt> - specify the class name of the association. Use it only if that name can't be inferred - # from the association name. So <tt>has_and_belongs_to_many :projects</tt> will by default be linked to the - # +Project+ class, but if the real class name is +SuperProject+, you'll have to specify it with this option. - # * <tt>:join_table</tt> - specify the name of the join table if the default based on lexical order isn't what you want. - # WARNING: If you're overwriting the table name of either class, the +table_name+ method MUST be declared underneath any - # +has_and_belongs_to_many+ declaration in order to work. - # * <tt>:foreign_key</tt> - specify the foreign key used for the association. By default this is guessed to be the name - # of this class in lower-case and +_id+ suffixed. So a +Person+ class that makes a +has_and_belongs_to_many+ association - # will use +person_id+ as the default +foreign_key+. - # * <tt>:association_foreign_key</tt> - specify the association foreign key used for the association. By default this is - # guessed to be the name of the associated class in lower-case and +_id+ suffixed. So if the associated class is +Project+, - # the +has_and_belongs_to_many+ association will use +project_id+ as the default association +foreign_key+. - # * <tt>:conditions</tt> - specify the conditions that the associated object must meet in order to be included as a +WHERE+ - # SQL fragment, such as <tt>authorized = 1</tt>. - # * <tt>:order</tt> - specify the order in which the associated objects are returned as an <tt>ORDER BY</tt> SQL fragment, - # such as <tt>last_name, first_name DESC</tt> - # * <tt>:uniq</tt> - if set to +true+, duplicate associated objects will be ignored by accessors and query methods - # * <tt>:finder_sql</tt> - overwrite the default generated SQL statement used to fetch the association with a manual statement - # * <tt>:delete_sql</tt> - overwrite the default generated SQL statement used to remove links between the associated - # classes with a manual statement - # * <tt>:insert_sql</tt> - overwrite the default generated SQL statement used to add links between the associated classes - # with a manual statement - # * <tt>:extend</tt> - anonymous module for extending the proxy, see "Association extensions". - # * <tt>:include</tt> - specify second-order associations that should be eager loaded when the collection is loaded. - # * <tt>:group</tt>: An attribute name by which the result should be grouped. Uses the <tt>GROUP BY</tt> SQL-clause. - # * <tt>:limit</tt>: An integer determining the limit on the number of rows that should be returned. - # * <tt>:offset</tt>: An integer determining the offset from where the rows should be fetched. So at 5, it would skip the first 4 rows. - # * <tt>:select</tt>: By default, this is <tt>*</tt> as in <tt>SELECT * FROM</tt>, but can be changed if, for example, you want to do a join - # but not include the joined columns. - # - # Option examples: - # has_and_belongs_to_many :projects - # has_and_belongs_to_many :projects, :include => [ :milestones, :manager ] - # has_and_belongs_to_many :nations, :class_name => "Country" - # has_and_belongs_to_many :categories, :join_table => "prods_cats" - # has_and_belongs_to_many :active_projects, :join_table => 'developers_projects', :delete_sql => - # 'DELETE FROM developers_projects WHERE active=1 AND developer_id = #{id} AND project_id = #{record.id}' - def has_and_belongs_to_many(association_id, options = {}, &extension) - reflection = create_has_and_belongs_to_many_reflection(association_id, options, &extension) - - add_multiple_associated_save_callbacks(reflection.name) - collection_accessor_methods(reflection, HasAndBelongsToManyAssociation) - - # Don't use a before_destroy callback since users' before_destroy - # callbacks will be executed after the association is wiped out. - old_method = "destroy_without_habtm_shim_for_#{reflection.name}" - class_eval <<-end_eval unless method_defined?(old_method) - alias_method :#{old_method}, :destroy_without_callbacks - def destroy_without_callbacks - #{reflection.name}.clear - #{old_method} - end - end_eval - - add_association_callbacks(reflection.name, options) - end - - private - # Generate a join table name from two provided tables names. - # The order of names in join name is determined by lexical precedence. - # join_table_name("members", "clubs") - # => "clubs_members" - # join_table_name("members", "special_clubs") - # => "members_special_clubs" - def join_table_name(first_table_name, second_table_name) - if first_table_name < second_table_name - join_table = "#{first_table_name}_#{second_table_name}" - else - join_table = "#{second_table_name}_#{first_table_name}" - end - - table_name_prefix + join_table + table_name_suffix - end - - def association_accessor_methods(reflection, association_proxy_class) - define_method(reflection.name) do |*params| - force_reload = params.first unless params.empty? - association = instance_variable_get("@#{reflection.name}") - - if association.nil? || force_reload - association = association_proxy_class.new(self, reflection) - retval = association.reload - if retval.nil? and association_proxy_class == BelongsToAssociation - instance_variable_set("@#{reflection.name}", nil) - return nil - end - instance_variable_set("@#{reflection.name}", association) - end - - association.target.nil? ? nil : association - end - - define_method("#{reflection.name}=") do |new_value| - association = instance_variable_get("@#{reflection.name}") - if association.nil? || association.target != new_value - association = association_proxy_class.new(self, reflection) - end - - association.replace(new_value) - - unless new_value.nil? - instance_variable_set("@#{reflection.name}", association) - else - instance_variable_set("@#{reflection.name}", nil) - end - end - - define_method("set_#{reflection.name}_target") do |target| - return if target.nil? and association_proxy_class == BelongsToAssociation - association = association_proxy_class.new(self, reflection) - association.target = target - instance_variable_set("@#{reflection.name}", association) - end - end - - def collection_reader_method(reflection, association_proxy_class) - define_method(reflection.name) do |*params| - force_reload = params.first unless params.empty? - association = instance_variable_get("@#{reflection.name}") - - unless association.respond_to?(:loaded?) - association = association_proxy_class.new(self, reflection) - instance_variable_set("@#{reflection.name}", association) - end - - association.reload if force_reload - - association - end - end - - def collection_accessor_methods(reflection, association_proxy_class, writer = true) - collection_reader_method(reflection, association_proxy_class) - - define_method("#{reflection.name}=") do |new_value| - # Loads proxy class instance (defined in collection_reader_method) if not already loaded - association = send(reflection.name) - association.replace(new_value) - association - end - - define_method("#{reflection.name.to_s.singularize}_ids") do - send(reflection.name).map(&:id) - end - - define_method("#{reflection.name.to_s.singularize}_ids=") do |new_value| - ids = (new_value || []).reject { |nid| nid.blank? } - send("#{reflection.name}=", reflection.class_name.constantize.find(ids)) - end if writer - end - - def add_multiple_associated_save_callbacks(association_name) - method_name = "validate_associated_records_for_#{association_name}".to_sym - define_method(method_name) do - association = instance_variable_get("@#{association_name}") - if association.respond_to?(:loaded?) - if new_record? - association - else - association.select { |record| record.new_record? } - end.each do |record| - errors.add "#{association_name}" unless record.valid? - end - end - end - - validate method_name - before_save("@new_record_before_save = new_record?; true") - - after_callback = <<-end_eval - association = instance_variable_get("@#{association_name}") - - records_to_save = if @new_record_before_save - association - elsif association.respond_to?(:loaded?) && association.loaded? - association.select { |record| record.new_record? } - else - [] - end - - records_to_save.each { |record| association.send(:insert_record, record) } unless records_to_save.blank? - - # reconstruct the SQL queries now that we know the owner's id - association.send(:construct_sql) if association.respond_to?(:construct_sql) - end_eval - - # Doesn't use after_save as that would save associations added in after_create/after_update twice - after_create(after_callback) - after_update(after_callback) - end - - def association_constructor_method(constructor, reflection, association_proxy_class) - define_method("#{constructor}_#{reflection.name}") do |*params| - attributees = params.first unless params.empty? - replace_existing = params[1].nil? ? true : params[1] - association = instance_variable_get("@#{reflection.name}") - - if association.nil? - association = association_proxy_class.new(self, reflection) - instance_variable_set("@#{reflection.name}", association) - end - - if association_proxy_class == HasOneAssociation - association.send(constructor, attributees, replace_existing) - else - association.send(constructor, attributees) - end - end - end - - def find_with_associations(options = {}) - catch :invalid_query do - join_dependency = JoinDependency.new(self, merge_includes(scope(:find, :include), options[:include]), options[:joins]) - rows = select_all_rows(options, join_dependency) - return join_dependency.instantiate(rows) - end - [] - end - - # See HasManyAssociation#delete_records. Dependent associations - # delete children, otherwise foreign key is set to NULL. - def configure_dependency_for_has_many(reflection) - if reflection.options.include?(:dependent) - # Add polymorphic type if the :as option is present - dependent_conditions = [] - dependent_conditions << "#{reflection.primary_key_name} = \#{record.quoted_id}" - dependent_conditions << "#{reflection.options[:as]}_type = '#{base_class.name}'" if reflection.options[:as] - dependent_conditions << sanitize_sql(reflection.options[:conditions]) if reflection.options[:conditions] - dependent_conditions = dependent_conditions.collect {|where| "(#{where})" }.join(" AND ") - - case reflection.options[:dependent] - when :destroy - module_eval "before_destroy '#{reflection.name}.each { |o| o.destroy }'" - when :delete_all - module_eval "before_destroy { |record| #{reflection.class_name}.delete_all(%(#{dependent_conditions})) }" - when :nullify - module_eval "before_destroy { |record| #{reflection.class_name}.update_all(%(#{reflection.primary_key_name} = NULL), %(#{dependent_conditions})) }" - else - raise ArgumentError, "The :dependent option expects either :destroy, :delete_all, or :nullify (#{reflection.options[:dependent].inspect})" - end - end - end - - def configure_dependency_for_has_one(reflection) - if reflection.options.include?(:dependent) - case reflection.options[:dependent] - when :destroy - module_eval "before_destroy '#{reflection.name}.destroy unless #{reflection.name}.nil?'" - when :delete - module_eval "before_destroy '#{reflection.class_name}.delete(#{reflection.name}.id) unless #{reflection.name}.nil?'" - when :nullify - module_eval "before_destroy '#{reflection.name}.update_attribute(\"#{reflection.primary_key_name}\", nil) unless #{reflection.name}.nil?'" - else - raise ArgumentError, "The :dependent option expects either :destroy, :delete or :nullify (#{reflection.options[:dependent].inspect})" - end - end - end - - def create_has_many_reflection(association_id, options, &extension) - options.assert_valid_keys( - :class_name, :table_name, :foreign_key, - :dependent, - :select, :conditions, :include, :order, :group, :limit, :offset, - :as, :through, :source, :source_type, - :uniq, - :finder_sql, :counter_sql, - :before_add, :after_add, :before_remove, :after_remove, - :extend - ) - - options[:extend] = create_extension_modules(association_id, extension, options[:extend]) if block_given? - - create_reflection(:has_many, association_id, options, self) - end - - def create_has_one_reflection(association_id, options) - options.assert_valid_keys( - :class_name, :foreign_key, :remote, :conditions, :order, :include, :dependent, :counter_cache, :extend, :as - ) - - create_reflection(:has_one, association_id, options, self) - end - - def create_belongs_to_reflection(association_id, options) - options.assert_valid_keys( - :class_name, :foreign_key, :foreign_type, :remote, :conditions, :order, :include, :dependent, - :counter_cache, :extend, :polymorphic - ) - - reflection = create_reflection(:belongs_to, association_id, options, self) - - if options[:polymorphic] - reflection.options[:foreign_type] ||= reflection.class_name.underscore + "_type" - end - - reflection - end - - def create_has_and_belongs_to_many_reflection(association_id, options, &extension) - options.assert_valid_keys( - :class_name, :table_name, :join_table, :foreign_key, :association_foreign_key, - :select, :conditions, :include, :order, :group, :limit, :offset, - :uniq, - :finder_sql, :delete_sql, :insert_sql, - :before_add, :after_add, :before_remove, :after_remove, - :extend - ) - - options[:extend] = create_extension_modules(association_id, extension, options[:extend]) if block_given? - - reflection = create_reflection(:has_and_belongs_to_many, association_id, options, self) - - reflection.options[:join_table] ||= join_table_name(undecorated_table_name(self.to_s), undecorated_table_name(reflection.class_name)) - - reflection - end - - def reflect_on_included_associations(associations) - [ associations ].flatten.collect { |association| reflect_on_association(association.to_s.intern) } - end - - def guard_against_unlimitable_reflections(reflections, options) - if (options[:offset] || options[:limit]) && !using_limitable_reflections?(reflections) - raise( - ConfigurationError, - "You can not use offset and limit together with has_many or has_and_belongs_to_many associations" - ) - end - end - - def select_all_rows(options, join_dependency) - connection.select_all( - construct_finder_sql_with_included_associations(options, join_dependency), - "#{name} Load Including Associations" - ) - end - - def construct_finder_sql_with_included_associations(options, join_dependency) - scope = scope(:find) - sql = "SELECT #{column_aliases(join_dependency)} FROM #{(scope && scope[:from]) || options[:from] || quoted_table_name} " - sql << join_dependency.join_associations.collect{|join| join.association_join }.join - - add_joins!(sql, options, scope) - add_conditions!(sql, options[:conditions], scope) - add_limited_ids_condition!(sql, options, join_dependency) if !using_limitable_reflections?(join_dependency.reflections) && ((scope && scope[:limit]) || options[:limit]) - - add_group!(sql, options[:group], scope) - add_order!(sql, options[:order], scope) - add_limit!(sql, options, scope) if using_limitable_reflections?(join_dependency.reflections) - add_lock!(sql, options, scope) - - return sanitize_sql(sql) - end - - def add_limited_ids_condition!(sql, options, join_dependency) - unless (id_list = select_limited_ids_list(options, join_dependency)).empty? - sql << "#{condition_word(sql)} #{connection.quote_table_name table_name}.#{primary_key} IN (#{id_list}) " - else - throw :invalid_query - end - end - - def select_limited_ids_list(options, join_dependency) - pk = columns_hash[primary_key] - - connection.select_all( - construct_finder_sql_for_association_limiting(options, join_dependency), - "#{name} Load IDs For Limited Eager Loading" - ).collect { |row| connection.quote(row[primary_key], pk) }.join(", ") - end - - def construct_finder_sql_for_association_limiting(options, join_dependency) - scope = scope(:find) - is_distinct = !options[:joins].blank? || include_eager_conditions?(options) || include_eager_order?(options) - sql = "SELECT " - if is_distinct - sql << connection.distinct("#{connection.quote_table_name table_name}.#{primary_key}", options[:order]) - else - sql << primary_key - end - sql << " FROM #{connection.quote_table_name table_name} " - - if is_distinct - sql << join_dependency.join_associations.collect(&:association_join).join - add_joins!(sql, options, scope) - end - - add_conditions!(sql, options[:conditions], scope) - add_group!(sql, options[:group], scope) - - if options[:order] && is_distinct - connection.add_order_by_for_association_limiting!(sql, options) - else - add_order!(sql, options[:order], scope) - end - - add_limit!(sql, options, scope) - - return sanitize_sql(sql) - end - - # Checks if the conditions reference a table other than the current model table - def include_eager_conditions?(options) - # look in both sets of conditions - conditions = [scope(:find, :conditions), options[:conditions]].inject([]) do |all, cond| - case cond - when nil then all - when Array then all << cond.first - else all << cond - end - end - return false unless conditions.any? - conditions.join(' ').scan(/([\.\w]+)\.\w+/).flatten.any? do |condition_table_name| - condition_table_name != table_name - end - end - - # Checks if the query order references a table other than the current model's table. - def include_eager_order?(options) - order = options[:order] - return false unless order - order.scan(/([\.\w]+)\.\w+/).flatten.any? do |order_table_name| - order_table_name != table_name - end - end - - def using_limitable_reflections?(reflections) - reflections.reject { |r| [ :belongs_to, :has_one ].include?(r.macro) }.length.zero? - end - - def column_aliases(join_dependency) - join_dependency.joins.collect{|join| join.column_names_with_alias.collect{|column_name, aliased_name| - "#{connection.quote_table_name join.aliased_table_name}.#{connection.quote_column_name column_name} AS #{aliased_name}"}}.flatten.join(", ") - end - - def add_association_callbacks(association_name, options) - callbacks = %w(before_add after_add before_remove after_remove) - callbacks.each do |callback_name| - full_callback_name = "#{callback_name}_for_#{association_name}" - defined_callbacks = options[callback_name.to_sym] - if options.has_key?(callback_name.to_sym) - class_inheritable_reader full_callback_name.to_sym - write_inheritable_attribute(full_callback_name.to_sym, [defined_callbacks].flatten) - else - write_inheritable_attribute(full_callback_name.to_sym, []) - end - end - end - - def condition_word(sql) - sql =~ /where/i ? " AND " : "WHERE " - end - - def create_extension_modules(association_id, block_extension, extensions) - extension_module_name = "#{self.to_s}#{association_id.to_s.camelize}AssociationExtension" - - silence_warnings do - Object.const_set(extension_module_name, Module.new(&block_extension)) - end - - Array(extensions).push(extension_module_name.constantize) - end - - class JoinDependency # :nodoc: - attr_reader :joins, :reflections, :table_aliases - - def initialize(base, associations, joins) - @joins = [JoinBase.new(base, joins)] - @associations = associations - @reflections = [] - @base_records_hash = {} - @base_records_in_order = [] - @table_aliases = Hash.new { |aliases, table| aliases[table] = 0 } - @table_aliases[base.table_name] = 1 - build(associations) - end - - def join_associations - @joins[1..-1].to_a - end - - def join_base - @joins[0] - end - - def instantiate(rows) - rows.each_with_index do |row, i| - primary_id = join_base.record_id(row) - unless @base_records_hash[primary_id] - @base_records_in_order << (@base_records_hash[primary_id] = join_base.instantiate(row)) - end - construct(@base_records_hash[primary_id], @associations, join_associations.dup, row) - end - remove_duplicate_results!(join_base.active_record, @base_records_in_order, @associations) - return @base_records_in_order - end - - def remove_duplicate_results!(base, records, associations) - case associations - when Symbol, String - reflection = base.reflections[associations] - if reflection && [:has_many, :has_and_belongs_to_many].include?(reflection.macro) - records.each { |record| record.send(reflection.name).target.uniq! } - end - when Array - associations.each do |association| - remove_duplicate_results!(base, records, association) - end - when Hash - associations.keys.each do |name| - reflection = base.reflections[name] - is_collection = [:has_many, :has_and_belongs_to_many].include?(reflection.macro) - - parent_records = records.map do |record| - next unless record.send(reflection.name) - is_collection ? record.send(reflection.name).target.uniq! : record.send(reflection.name) - end.flatten.compact - - remove_duplicate_results!(reflection.class_name.constantize, parent_records, associations[name]) unless parent_records.empty? - end - end - end - - protected - def build(associations, parent = nil) - parent ||= @joins.last - case associations - when Symbol, String - reflection = parent.reflections[associations.to_s.intern] or - raise ConfigurationError, "Association named '#{ associations }' was not found; perhaps you misspelled it?" - @reflections << reflection - @joins << build_join_association(reflection, parent) - when Array - associations.each do |association| - build(association, parent) - end - when Hash - associations.keys.sort{|a,b|a.to_s<=>b.to_s}.each do |name| - build(name, parent) - build(associations[name]) - end - else - raise ConfigurationError, associations.inspect - end - end - - # overridden in InnerJoinDependency subclass - def build_join_association(reflection, parent) - JoinAssociation.new(reflection, self, parent) - end - - def construct(parent, associations, joins, row) - case associations - when Symbol, String - while (join = joins.shift).reflection.name.to_s != associations.to_s - raise ConfigurationError, "Not Enough Associations" if joins.empty? - end - construct_association(parent, join, row) - when Array - associations.each do |association| - construct(parent, association, joins, row) - end - when Hash - associations.keys.sort{|a,b|a.to_s<=>b.to_s}.each do |name| - association = construct_association(parent, joins.shift, row) - construct(association, associations[name], joins, row) if association - end - else - raise ConfigurationError, associations.inspect - end - end - - def construct_association(record, join, row) - case join.reflection.macro - when :has_many, :has_and_belongs_to_many - collection = record.send(join.reflection.name) - collection.loaded - - return nil if record.id.to_s != join.parent.record_id(row).to_s or row[join.aliased_primary_key].nil? - association = join.instantiate(row) - collection.target.push(association) - when :has_one - return if record.id.to_s != join.parent.record_id(row).to_s - association = join.instantiate(row) unless row[join.aliased_primary_key].nil? - record.send("set_#{join.reflection.name}_target", association) - when :belongs_to - return if record.id.to_s != join.parent.record_id(row).to_s or row[join.aliased_primary_key].nil? - association = join.instantiate(row) - record.send("set_#{join.reflection.name}_target", association) - else - raise ConfigurationError, "unknown macro: #{join.reflection.macro}" - end - return association - end - - class JoinBase # :nodoc: - attr_reader :active_record, :table_joins - delegate :table_name, :column_names, :primary_key, :reflections, :sanitize_sql, :to => :active_record - - def initialize(active_record, joins = nil) - @active_record = active_record - @cached_record = {} - @table_joins = joins - end - - def aliased_prefix - "t0" - end - - def aliased_primary_key - "#{ aliased_prefix }_r0" - end - - def aliased_table_name - active_record.table_name - end - - def column_names_with_alias - unless @column_names_with_alias - @column_names_with_alias = [] - ([primary_key] + (column_names - [primary_key])).each_with_index do |column_name, i| - @column_names_with_alias << [column_name, "#{ aliased_prefix }_r#{ i }"] - end - end - return @column_names_with_alias - end - - def extract_record(row) - column_names_with_alias.inject({}){|record, (cn, an)| record[cn] = row[an]; record} - end - - def record_id(row) - row[aliased_primary_key] - end - - def instantiate(row) - @cached_record[record_id(row)] ||= active_record.send(:instantiate, extract_record(row)) - end - end - - class JoinAssociation < JoinBase # :nodoc: - attr_reader :reflection, :parent, :aliased_table_name, :aliased_prefix, :aliased_join_table_name, :parent_table_name - delegate :options, :klass, :through_reflection, :source_reflection, :to => :reflection - - def initialize(reflection, join_dependency, parent = nil) - reflection.check_validity! - if reflection.options[:polymorphic] - raise EagerLoadPolymorphicError.new(reflection) - end - - super(reflection.klass) - @parent = parent - @reflection = reflection - @aliased_prefix = "t#{ join_dependency.joins.size }" - @aliased_table_name = table_name #.tr('.', '_') # start with the table name, sub out any .'s - @parent_table_name = parent.active_record.table_name - - if !parent.table_joins.blank? && parent.table_joins.to_s.downcase =~ %r{join(\s+\w+)?\s+#{aliased_table_name.downcase}\son} - join_dependency.table_aliases[aliased_table_name] += 1 - end - - unless join_dependency.table_aliases[aliased_table_name].zero? - # if the table name has been used, then use an alias - @aliased_table_name = active_record.connection.table_alias_for "#{pluralize(reflection.name)}_#{parent_table_name}" - table_index = join_dependency.table_aliases[aliased_table_name] - join_dependency.table_aliases[aliased_table_name] += 1 - @aliased_table_name = @aliased_table_name[0..active_record.connection.table_alias_length-3] + "_#{table_index+1}" if table_index > 0 - else - join_dependency.table_aliases[aliased_table_name] += 1 - end - - if reflection.macro == :has_and_belongs_to_many || (reflection.macro == :has_many && reflection.options[:through]) - @aliased_join_table_name = reflection.macro == :has_and_belongs_to_many ? reflection.options[:join_table] : reflection.through_reflection.klass.table_name - unless join_dependency.table_aliases[aliased_join_table_name].zero? - @aliased_join_table_name = active_record.connection.table_alias_for "#{pluralize(reflection.name)}_#{parent_table_name}_join" - table_index = join_dependency.table_aliases[aliased_join_table_name] - join_dependency.table_aliases[aliased_join_table_name] += 1 - @aliased_join_table_name = @aliased_join_table_name[0..active_record.connection.table_alias_length-3] + "_#{table_index+1}" if table_index > 0 - else - join_dependency.table_aliases[aliased_join_table_name] += 1 - end - end - end - - def association_join - connection = reflection.active_record.connection - join = case reflection.macro - when :has_and_belongs_to_many - " #{join_type} %s ON %s.%s = %s.%s " % [ - table_alias_for(options[:join_table], aliased_join_table_name), - connection.quote_table_name(aliased_join_table_name), - options[:foreign_key] || reflection.active_record.to_s.foreign_key, - connection.quote_table_name(parent.aliased_table_name), - reflection.active_record.primary_key] + - " #{join_type} %s ON %s.%s = %s.%s " % [ - table_name_and_alias, - connection.quote_table_name(aliased_table_name), - klass.primary_key, - connection.quote_table_name(aliased_join_table_name), - options[:association_foreign_key] || klass.to_s.foreign_key - ] - when :has_many, :has_one - case - when reflection.macro == :has_many && reflection.options[:through] - through_conditions = through_reflection.options[:conditions] ? "AND #{interpolate_sql(sanitize_sql(through_reflection.options[:conditions]))}" : '' - - jt_foreign_key = jt_as_extra = jt_source_extra = jt_sti_extra = nil - first_key = second_key = as_extra = nil - - if through_reflection.options[:as] # has_many :through against a polymorphic join - jt_foreign_key = through_reflection.options[:as].to_s + '_id' - jt_as_extra = " AND %s.%s = %s" % [ - connection.quote_table_name(aliased_join_table_name), - connection.quote_column_name(through_reflection.options[:as].to_s + '_type'), - klass.quote_value(parent.active_record.base_class.name) - ] - else - jt_foreign_key = through_reflection.primary_key_name - end - - case source_reflection.macro - when :has_many - if source_reflection.options[:as] - first_key = "#{source_reflection.options[:as]}_id" - second_key = options[:foreign_key] || primary_key - as_extra = " AND %s.%s = %s" % [ - connection.quote_table_name(aliased_table_name), - connection.quote_column_name("#{source_reflection.options[:as]}_type"), - klass.quote_value(source_reflection.active_record.base_class.name) - ] - else - first_key = through_reflection.klass.base_class.to_s.foreign_key - second_key = options[:foreign_key] || primary_key - end - - unless through_reflection.klass.descends_from_active_record? - jt_sti_extra = " AND %s.%s = %s" % [ - connection.quote_table_name(aliased_join_table_name), - connection.quote_column_name(through_reflection.active_record.inheritance_column), - through_reflection.klass.quote_value(through_reflection.klass.name.demodulize)] - end - when :belongs_to - first_key = primary_key - if reflection.options[:source_type] - second_key = source_reflection.association_foreign_key - jt_source_extra = " AND %s.%s = %s" % [ - connection.quote_table_name(aliased_join_table_name), - connection.quote_column_name(reflection.source_reflection.options[:foreign_type]), - klass.quote_value(reflection.options[:source_type]) - ] - else - second_key = source_reflection.primary_key_name - end - end - - " #{join_type} %s ON (%s.%s = %s.%s%s%s%s) " % [ - table_alias_for(through_reflection.klass.table_name, aliased_join_table_name), - connection.quote_table_name(parent.aliased_table_name), - connection.quote_column_name(parent.primary_key), - connection.quote_table_name(aliased_join_table_name), - connection.quote_column_name(jt_foreign_key), - jt_as_extra, jt_source_extra, jt_sti_extra - ] + - " #{join_type} %s ON (%s.%s = %s.%s%s) " % [ - table_name_and_alias, - connection.quote_table_name(aliased_table_name), - connection.quote_column_name(first_key), - connection.quote_table_name(aliased_join_table_name), - connection.quote_column_name(second_key), - as_extra - ] - - when reflection.options[:as] && [:has_many, :has_one].include?(reflection.macro) - " #{join_type} %s ON %s.%s = %s.%s AND %s.%s = %s" % [ - table_name_and_alias, - connection.quote_table_name(aliased_table_name), - "#{reflection.options[:as]}_id", - connection.quote_table_name(parent.aliased_table_name), - parent.primary_key, - connection.quote_table_name(aliased_table_name), - "#{reflection.options[:as]}_type", - klass.quote_value(parent.active_record.base_class.name) - ] - else - foreign_key = options[:foreign_key] || reflection.active_record.name.foreign_key - " #{join_type} %s ON %s.%s = %s.%s " % [ - table_name_and_alias, - aliased_table_name, - foreign_key, - parent.aliased_table_name, - parent.primary_key - ] - end - when :belongs_to - " #{join_type} %s ON %s.%s = %s.%s " % [ - table_name_and_alias, - connection.quote_table_name(aliased_table_name), - reflection.klass.primary_key, - connection.quote_table_name(parent.aliased_table_name), - options[:foreign_key] || klass.to_s.foreign_key - ] - else - "" - end || '' - join << %(AND %s.%s = %s ) % [ - connection.quote_table_name(aliased_table_name), - connection.quote_column_name(klass.inheritance_column), - klass.quote_value(klass.name.demodulize)] unless klass.descends_from_active_record? - - [through_reflection, reflection].each do |ref| - join << "AND #{interpolate_sql(sanitize_sql(ref.options[:conditions]))} " if ref && ref.options[:conditions] - end - - join - end - - protected - - def pluralize(table_name) - ActiveRecord::Base.pluralize_table_names ? table_name.to_s.pluralize : table_name - end - - def table_alias_for(table_name, table_alias) - "#{reflection.active_record.connection.quote_table_name(table_name)} #{table_alias if table_name != table_alias}".strip - end - - def table_name_and_alias - table_alias_for table_name, @aliased_table_name - end - - def interpolate_sql(sql) - instance_eval("%@#{sql.gsub('@', '\@')}@") - end - - private - - def join_type - "LEFT OUTER JOIN" - end - end - end - - class InnerJoinDependency < JoinDependency # :nodoc: - protected - def build_join_association(reflection, parent) - InnerJoinAssociation.new(reflection, self, parent) - end - - class InnerJoinAssociation < JoinAssociation - private - def join_type - "INNER JOIN" - end - end - end - - end - end -end |