reset!

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 280
      def reset!
        clear_cache!
        reset_transaction
        unless @connection.transaction_status == ::PG::PQTRANS_IDLE
          @connection.query 'ROLLBACK'
        end
        @connection.query 'DISCARD ALL'
        configure_connection
      end