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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-3602] It would be nice to clarify the behaviour when using $addToSet to add subdocuments to an array</title>
                <link>https://jira.mongodb.org/browse/DOCS-3602</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Currently MongoDB compares the subdocuments by comparing the BSON data, and it doesn&#8217;t check the contents in the subdocuments. So when you use &lt;tt&gt;$addToSet&lt;/tt&gt; to add subdocuments to an array, if the order of the fields in the subdocuments are different, they would be considered as different documents even if the values for all the fields in the subdocuments are the same.&lt;/p&gt;

&lt;p&gt;It would be nice to document this behaviour for &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/update/addToSet/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;$addToSet&lt;/tt&gt;&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="142216">DOCS-3602</key>
            <summary>It would be nice to clarify the behaviour when using $addToSet to add subdocuments to an array</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="linda.qin@mongodb.com">Linda Qin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Jun 2014 06:56:18 +0000</created>
                <updated>Mon, 16 Mar 2015 23:56:56 +0000</updated>
                            <resolved>Fri, 27 Jun 2014 15:01:21 +0000</resolved>
                                                    <fixVersion>v1.3.7</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="636382" author="xgen-internal-githook" created="Fri, 27 Jun 2014 15:00:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-3602&quot; title=&quot;It would be nice to clarify the behaviour when using $addToSet to add subdocuments to an array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3602&quot;&gt;&lt;del&gt;DOCS-3602&lt;/del&gt;&lt;/a&gt; behavior of addToSet with a document&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/d96c8ec4a32256d26dc55685dd1ce1cc02a0f8c4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/d96c8ec4a32256d26dc55685dd1ce1cc02a0f8c4&lt;/a&gt;&lt;/p&gt;</comment>
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