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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-12818] Highlight that _id should be removed before using $merge without _id in &apos;on&apos; fields</title>
                <link>https://jira.mongodb.org/browse/DOCS-12818</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;When designing the $merge stage we realized that using a set of &apos;on&apos; fields other than _id will often result in the user accidentally trying to modify the _id of the target document. When the &apos;whenMatched&apos; mode is &quot;merge&quot; (the default), the update generated by the $merge stage will include the _id from the document in the pipeline which is likely different than the one targeted by the &apos;on&apos; fields. Further, because $project includes the _id by default, it might not be obvious to users whether the document going into $merge has an _id at all.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt;&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="810082">DOCS-12818</key>
            <summary>Highlight that _id should be removed before using $merge without _id in &apos;on&apos; fields</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Jun 2019 14:13:54 +0000</created>
                <updated>Mon, 30 Oct 2023 20:38:49 +0000</updated>
                            <resolved>Fri, 5 Jul 2019 21:58:09 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2313944" author="xgen-internal-githook" created="Fri, 5 Jul 2019 21:57:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12818&quot; title=&quot;Highlight that _id should be removed before using $merge without _id in &amp;#39;on&amp;#39; fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12818&quot;&gt;&lt;del&gt;DOCS-12818&lt;/del&gt;&lt;/a&gt;: merge and _id field&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/698ce7cd4534073df873436ac0be158bf937e68a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/698ce7cd4534073df873436ac0be158bf937e68a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2292946" author="kay.kim@10gen.com" created="Fri, 21 Jun 2019 14:57:17 +0000"  >&lt;p&gt;We currently state&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;When performing a merge, the merged document cannot result in a modification of the _id value or, if the output collection is sharded, the shard key value.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Will add the aforementioned workaround of removing the _id field.&lt;/p&gt;

&lt;p&gt;as well as include the workaround in &lt;a href=&quot;https://docs.mongodb.com/master/reference/operator/aggregation/merge/#existing-documents-and-id-and-shard-key-values&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/master/reference/operator/aggregation/merge/#existing-documents-and-id-and-shard-key-values&lt;/a&gt; section&lt;/p&gt;</comment>
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