Class: ActiveRecord::Associations::ClassMethods::JoinDependency::JoinAssociation
- Inherits:
-
Object
- Object
- ActiveRecord::Associations::ClassMethods::JoinDependency::JoinAssociation
- Defined in:
- lib/composite_primary_keys/associations.rb
Instance Method Summary collapse
- #association_join ⇒ Object
-
#composite_join_predicates(table1, keys1, table2, keys2) ⇒ Object
Ugly to include this twice, but I couldn’t figure out how to make this work via a module.
Instance Method Details
#association_join ⇒ Object
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# File 'lib/composite_primary_keys/associations.rb', line 35 def association_join return @join if @join aliased_table = Arel::Table.new(table_name, :as => @aliased_table_name, :engine => arel_engine, :columns => klass.columns) parent_table = Arel::Table.new(parent.table_name, :as => parent.aliased_table_name, :engine => arel_engine, :columns => parent.active_record.columns) @join = case reflection.macro when :has_and_belongs_to_many join_table = Arel::Table.new([:join_table], :as => aliased_join_table_name, :engine => arel_engine) fk = [:foreign_key] || reflection.active_record.to_s.foreign_key klass_fk = [:association_foreign_key] || klass.to_s.foreign_key [ join_table[fk].eq(parent_table[reflection.active_record.primary_key]), aliased_table[klass.primary_key].eq(join_table[klass_fk]) ] when :has_many, :has_one if reflection.[:through] join_table = Arel::Table.new(through_reflection.klass.table_name, :as => aliased_join_table_name, :engine => arel_engine) jt_as_extra = jt_source_extra = jt_sti_extra = nil first_key = second_key = as_extra = nil if through_reflection.macro == :belongs_to jt_primary_key = through_reflection.primary_key_name jt_foreign_key = through_reflection.association_primary_key else jt_primary_key = through_reflection.active_record_primary_key jt_foreign_key = through_reflection.primary_key_name if through_reflection.[:as] # has_many :through against a polymorphic join jt_as_extra = join_table[through_reflection.[:as].to_s + '_type'].eq(parent.active_record.base_class.name) end end case source_reflection.macro when :has_many if source_reflection.[:as] first_key = "#{source_reflection.[:as]}_id" second_key = [:foreign_key] || primary_key as_extra = aliased_table["#{source_reflection.[:as]}_type"].eq(source_reflection.active_record.base_class.name) else first_key = through_reflection.klass.base_class.to_s.foreign_key second_key = [:foreign_key] || primary_key end unless through_reflection.klass.descends_from_active_record? jt_sti_extra = join_table[through_reflection.active_record.inheritance_column].eq(through_reflection.klass.sti_name) end when :belongs_to first_key = primary_key if reflection.[:source_type] second_key = source_reflection.association_foreign_key jt_source_extra = join_table[reflection.source_reflection.[:foreign_type]].eq(reflection.[:source_type]) else second_key = source_reflection.primary_key_name end end [ [parent_table[jt_primary_key].eq(join_table[jt_foreign_key]), jt_as_extra, jt_source_extra, jt_sti_extra].reject{|x| x.blank? }, aliased_table[first_key].eq(join_table[second_key]) ] elsif reflection.[:as] id_rel = aliased_table["#{reflection.[:as]}_id"].eq(parent_table[parent.primary_key]) type_rel = aliased_table["#{reflection.[:as]}_type"].eq(parent.active_record.base_class.name) [id_rel, type_rel] else foreign_key = [:foreign_key] || reflection.active_record.name.foreign_key # CPK #[aliased_table[foreign_key].eq(parent_table[reflection.options[:primary_key] || parent.primary_key])] composite_join_predicates(aliased_table, foreign_key, parent_table, reflection.[:primary_key] || parent.primary_key) end when :belongs_to [aliased_table[[:primary_key] || reflection.klass.primary_key].eq(parent_table[[:foreign_key] || reflection.primary_key_name])] end unless klass.descends_from_active_record? sti_column = aliased_table[klass.inheritance_column] sti_condition = sti_column.eq(klass.sti_name) klass.descendants.each {|subclass| sti_condition = sti_condition.or(sti_column.eq(subclass.sti_name)) } @join << sti_condition end [through_reflection, reflection].each do |ref| if ref && ref.[:conditions] @join << process_conditions(ref.[:conditions], aliased_table_name) end end @join end |
#composite_join_predicates(table1, keys1, table2, keys2) ⇒ Object
Ugly to include this twice, but I couldn’t figure out how to make this work via a module
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# File 'lib/composite_primary_keys/associations.rb', line 21 def composite_join_predicates(table1, keys1, table2, keys2) attributes1 = [keys1].flatten.map do |key| table1[key] end attributes2 = [keys2].flatten.map do |key| table2[key] end [attributes1, attributes2].transpose.map do |attribute1, attribute2| attribute1.eq(attribute2) end end |