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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2206] Updating _id field fails with $set, works on replacement</title>
                <link>https://jira.mongodb.org/browse/SERVER-2206</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At the moment you can do an update to change the whole document, but not $set the _id.&lt;/p&gt;

&lt;p&gt;This seems inconsistent; you should either be allowed to change the _id field, or not.&lt;/p&gt;

&lt;p&gt;The current replacement model seems to just be a shortcut for delete/insert.&lt;/p&gt;</description>
                <environment></environment>
        <key id="13929">SERVER-2206</key>
            <summary>Updating _id field fails with $set, works on replacement</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                    </labels>
                <created>Fri, 10 Dec 2010 20:45:56 +0000</created>
                <updated>Tue, 12 Jul 2016 00:18:14 +0000</updated>
                            <resolved>Sun, 12 Dec 2010 16:20:11 +0000</resolved>
                                                    <fixVersion>1.7.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="21349" author="eliot" created="Sun, 12 Dec 2010 16:59:37 +0000"  >&lt;p&gt;Its immutable because semantically its the primary key, and is used as such in the code, and in various tools.&lt;/p&gt;

&lt;p&gt;The code on the server was just there to make replication not break in that case, not to explicitly offer an atomic delete + insert.&lt;/p&gt;

&lt;p&gt;I&apos;ve never seen anyone rely on this.&lt;/p&gt;</comment>
                            <comment id="21348" author="scotthernandez" created="Sun, 12 Dec 2010 16:40:39 +0000"  >&lt;p&gt;I have a feeling people are relying on that functionality; someone specifically wrote that code on the server to support a quick, and atomic, delete+insert when changing the _id field on update.&lt;/p&gt;

&lt;p&gt;I understand the _id field is &lt;b&gt;currently&lt;/b&gt; immutable, but why is that? It seems like removing that restriction will keep existing code working and support more options; what is the downside? Is it an issue with the fact that it is actually a delete+insert and that is not obvious/expected?&lt;/p&gt;</comment>
                            <comment id="21347" author="auto" created="Sun, 12 Dec 2010 16:20:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: can never change _id with a full object update &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2206&quot; title=&quot;Updating _id field fails with $set, works on replacement&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2206&quot;&gt;&lt;del&gt;SERVER-2206&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/47d2007d88f9f8f93bb7c8af269246e94e22f76d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/47d2007d88f9f8f93bb7c8af269246e94e22f76d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21346" author="eliot" created="Sun, 12 Dec 2010 16:20:11 +0000"  >&lt;p&gt;It now throws an error as changing _id should never be allowed.&lt;/p&gt;</comment>
                            <comment id="21313" author="memelet" created="Fri, 10 Dec 2010 20:58:45 +0000"  >&lt;p&gt;My preference would be ignore the _id in the update-document. Update all the values (except _id) of the existing-document with the values of the update-document.&lt;/p&gt;</comment>
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