query_constraints_list

# File activerecord/lib/active_record/persistence.rb, line 499
      def query_constraints_list # :nodoc:
        @query_constraints_list ||= if base_class? || primary_key != base_class.primary_key
          primary_key if primary_key.is_a?(Array)
        else
          base_class.query_constraints_list
        end
      end