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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-1759] Clarify behavior of upsert operations when the query field has a unique index</title>
                <link>https://jira.mongodb.org/browse/DOCS-1759</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;See: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10350&quot; title=&quot;Atomicity of Upserts on multi field unique index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10350&quot;&gt;&lt;del&gt;SERVER-10350&lt;/del&gt;&lt;/a&gt; for discussion.&lt;/p&gt;

&lt;p&gt;The behavior of updates and findAndModify with the upsert flag when the query predicate is on a unique index is the same.  The findAndModify documentation explain this, but the update docs do not.&lt;/p&gt;

&lt;p&gt;See the end of this page: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/command/findAndModify/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/command/findAndModify/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;User suggests adding to this page as well:&lt;br/&gt;
&lt;a href=&quot;http://docs.mongodb.org/manual/core/create/#crud-create-update&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/create/#crud-create-update&lt;/a&gt;&lt;/p&gt;
</description>
                <environment></environment>
        <key id="83976">DOCS-1759</key>
            <summary>Clarify behavior of upsert operations when the query field has a unique index</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Jul 2013 14:37:14 +0000</created>
                <updated>Fri, 17 Oct 2014 17:28:05 +0000</updated>
                            <resolved>Fri, 17 Oct 2014 17:28:05 +0000</resolved>
                                                    <fixVersion>v1.3.12</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="744312" author="xgen-internal-githook" created="Fri, 17 Oct 2014 17:27:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1759&quot; title=&quot;Clarify behavior of upsert operations when the query field has a unique index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1759&quot;&gt;&lt;del&gt;DOCS-1759&lt;/del&gt;&lt;/a&gt;: adding cross reference&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/979142bc53e75b58e550eb7cda31836b2a0e1057&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/979142bc53e75b58e550eb7cda31836b2a0e1057&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="628796" author="scotthernandez" created="Fri, 20 Jun 2014 11:36:59 +0000"  >&lt;p&gt;This is covered in the update docs: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/method/db.collection.update/#use-unique-indexes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/method/db.collection.update/#use-unique-indexes&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Not sure about describing this in the index docs, so it seems this can be closed as fixed already.&lt;/p&gt;</comment>
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