Class: Og::JoinsMany
Overview
A ‘joins_many’ relation. This objects is associated with an other using an intermediate join table.
Examples
joins_many Category joins_many :categories, Category
Direct Known Subclasses
Instance Attribute Summary
Attributes inherited from Relation
Instance Method Summary collapse
Methods inherited from Relation
#[], #[]=, enchant, #initialize, #method_missing, #polymorphic?, #polymorphic_marker?, resolve, resolve_names, #resolve_polymorphic, resolve_polymorphic_markers, resolve_polymorphic_relations, resolve_targets, symbol_to_class, #to_s
Constructor Details
This class inherits a constructor from Og::Relation
Dynamic Method Handling
This class handles dynamic methods through the method_missing method in the class Og::Relation
Instance Method Details
#enchant ⇒ Object
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# File 'lib/og/relation/joins_many.rb', line 22 def enchant self[:owner_singular_name] = owner_class.to_s.demodulize.underscore.downcase self[:target_singular_name] = target_plural_name.to_s.singular store = owner_class.ogmanager.store # handle schema_inheritance join_class = owner_class if sclass = owner_class.ann.self[:superclass] join_class = sclass end join_table_info = store.join_table_info(join_class, target_class) if through = self[:through] # A custom class is used for the join. Use the class # table and don't create a new table. through = Relation.symbol_to_class(through, owner_class) if through.is_a?(Symbol) join_table = self[:join_table] = through.table else # Calculate the name of the join table join_table = self[:join_table] = join_table_info[:table] # Create a join table. owner_class.ann :self, :join_tables => [] if owner_class.ann.self.join_tables.nil? owner_class.ann.self.join_tables! << join_table_info end owner_key = join_table_info[:owner_key] target_key = join_table_info[:target_key] owner_class.module_eval %{ attr_accessor :#{target_plural_name} def #{target_plural_name}(options = nil) reload = options and options[:reload] unless @#{target_plural_name} @#{target_plural_name} = JoinsManyCollection.new( self, #{target_class}, :add_#{target_singular_name}, :remove_#{target_singular_name}, :find_#{target_plural_name}, :count_#{target_plural_name}, options ) end @#{target_plural_name}.find_options = options @#{target_plural_name}.reload(options) if options and options[:reload] @#{target_plural_name} end def add_#{target_singular_name}(obj, options = nil) obj.save if obj.unsaved? obj.class.ogmanager.store.join(self, obj, "#{join_table}", options) end def remove_#{target_singular_name}(obj) obj.class.ogmanager.store.unjoin(self, obj, "#{join_table}") end def find_#{target_plural_name}(options = {}) find_options = { :join_table => "#{join_table}", :join_condition => "#{join_table}.#{target_key}=\#{#{target_class}::OGTABLE}.oid", :condition => "#{join_table}.#{owner_key}=\#\{#{owner_class.primary_key}\}" } if options if condition = options.delete(:condition) find_options[:condition] += " AND (\#{condition})" end find_options.update(options) end #{target_class}.find(find_options) end #-- # TODO: optimize this!! #++ def count_#{target_plural_name} find_options = { :join_table => "#{join_table}", :join_condition => "#{join_table}.#{target_key}=\#{#{target_class}::OGTABLE}.oid", :condition => "#{join_table}.#{owner_key}=\#\{#{owner_class.primary_key}\}" } #{target_class}.find(find_options).size end } if through owner_class.module_eval %{ def #{target_singular_name}_join_data(t) #{through}.find_one(:condition => "#{owner_key}=\#{#{owner_class.primary_key}} and #{target_key}=\#{t.pk}") end } end end |