# perldoc > MongoDB::UpdateResult

## NAME
    [MongoDB::UpdateResult](https://www.chedong.com/phpMan.php/perldoc/MongoDB%3A%3AUpdateResult/markdown) - MongoDB update result object

## VERSION
    version v2.2.2

## SYNOPSIS
        my $result = $coll->update( @parameters );

        if ( $result->acknowledged ) {
            ...
        }

## DESCRIPTION
    This class encapsulates the results from an update or replace operations.

## ATTRIBUTES
  matched_count
    The number of documents that matched the filter.

  modified_count
    The number of documents that were modified. Note: this is only available from MongoDB version
    2.6 or later. It will return "undef" from earlier servers.

    You can call "has_modified_count" to find out if this attribute is defined or not.

  upserted_id
    The identifier of the inserted document if an upsert took place. If no upsert took place, it
    returns "undef".

## METHODS
  acknowledged
    Indicates whether this write result was acknowledged. Always true for this class.

  assert
    Throws an error if write errors or write concern errors occurred. Otherwise, returns the
    invocant.

  assert_no_write_error
    Throws a [MongoDB::WriteError](https://www.chedong.com/phpMan.php/perldoc/MongoDB%3A%3AWriteError/markdown) if write errors occurred. Otherwise, returns the invocant.

  assert_no_write_concern_error
    Throws a [MongoDB::WriteConcernError](https://www.chedong.com/phpMan.php/perldoc/MongoDB%3A%3AWriteConcernError/markdown) if write concern errors occurred. Otherwise, returns the
    invocant.

## AUTHORS
    *   David Golden <<david@mongodb.com>>

    *   Rassi <<rassi@mongodb.com>>

    *   Mike Friedman <<friedo@friedo.com>>

    *   Kristina Chodorow <<k.chodorow@gmail.com>>

    *   Florian Ragwitz <<rafl@debian.org>>

## COPYRIGHT AND LICENSE
    This software is Copyright (c) 2020 by MongoDB, Inc.

    This is free software, licensed under:

      The Apache License, Version 2.0, January 2004