method

construct_joins

Importance_0
v2.2.1 - Show latest stable - 0 notes - Class: ActiveRecord::Associations::HasManyThroughAssociation
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construct_joins(custom_joins = nil) protected

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# File activerecord/lib/active_record/associations/has_many_through_association.rb, line 140
        def construct_joins(custom_joins = nil)
          polymorphic_join = nil
          if @reflection.source_reflection.macro == :belongs_to
            reflection_primary_key = @reflection.klass.primary_key
            source_primary_key     = @reflection.source_reflection.primary_key_name
            if @reflection.options[:source_type]
              polymorphic_join = "AND %s.%s = %s" % [
                @reflection.through_reflection.quoted_table_name, "#{@reflection.source_reflection.options[:foreign_type]}",
                @owner.class.quote_value(@reflection.options[:source_type])
              ]
            end
          else
            reflection_primary_key = @reflection.source_reflection.primary_key_name
            source_primary_key     = @reflection.klass.primary_key
            if @reflection.source_reflection.options[:as]
              polymorphic_join = "AND %s.%s = %s" % [
                @reflection.quoted_table_name, "#{@reflection.source_reflection.options[:as]}_type",
                @owner.class.quote_value(@reflection.through_reflection.klass.name)
              ]
            end
          end

          "INNER JOIN %s ON %s.%s = %s.%s %s #{@reflection.options[:joins]} #{custom_joins}" % [
            @reflection.through_reflection.table_name,
            @reflection.table_name, reflection_primary_key,
            @reflection.through_reflection.table_name, source_primary_key,
            polymorphic_join
          ]
        end
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