next_chain_scope

# File activerecord/lib/active_record/associations/association_scope.rb, line 81
      def next_chain_scope(scope, table, reflection, association_klass, foreign_table, next_reflection)
        join_keys = reflection.join_keys(association_klass)
        key = join_keys.key
        foreign_key = join_keys.foreign_key

        constraint = table[key].eq(foreign_table[foreign_key])

        if reflection.type
          value = transform_value(next_reflection.klass.base_class.name)
          scope = scope.where(table.name => { reflection.type => value })
        end

        scope = scope.joins(join(foreign_table, constraint))
      end