reset!

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 289
      def reset!
        @lock.synchronize do
          clear_cache!
          reset_transaction
          unless @connection.transaction_status == ::PG::PQTRANS_IDLE
            @connection.query "ROLLBACK"
          end
          @connection.query "DISCARD ALL"
          configure_connection
        end
      end