add_limited_ids_condition!

# File activerecord/lib/active_record/associations.rb, line 963
        def add_limited_ids_condition!(sql, options)
          unless (id_list = select_limited_ids_list(options)).empty?
            sql << "#{condition_word(sql)} #{table_name}.#{primary_key} IN (#{id_list}) "
          end
        end