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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>[SERVER-11285] $set issue: have conflicting mods in update</title>
                <link>https://jira.mongodb.org/browse/SERVER-11285</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the update operation if one of the updated key is prefix of any other updated key, I am getting &quot;have conflicting mods in update&quot; error. We are facing issue in our production system. Can someone throw some light if this is an expected behavior or there is some issue?&lt;/p&gt;</description>
                <environment>x86_64 GNU/Linux</environment>
        <key id="95016">SERVER-11285</key>
            <summary>$set issue: have conflicting mods in update</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="-1">Unassigned</assignee>
                                    <reporter username="abhishekiitg10@gmail.com">Abhishek Kumar</reporter>
                        <labels>
                    </labels>
                <created>Mon, 21 Oct 2013 07:13:22 +0000</created>
                <updated>Mon, 16 Nov 2015 19:23:52 +0000</updated>
                            <resolved>Mon, 21 Oct 2013 11:22:35 +0000</resolved>
                                    <version>2.4.1</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="443743" author="abhishekiitg10@gmail.com" created="Mon, 21 Oct 2013 12:30:49 +0000"  >&lt;p&gt;Thanks, it was helpful&lt;/p&gt;</comment>
                            <comment id="443724" author="scotthernandez" created="Mon, 21 Oct 2013 11:22:35 +0000"  >&lt;p&gt;This is expected behavior. You cannot do an update where more than one modification shares a (path) prefix.&lt;/p&gt;

&lt;p&gt;The main reason for this is because the order of the modification is not defined (since most languages don&apos;t use an ordered dictionary/map &amp;#8211; esp. not by default) and the result of applying &quot;b.c&quot; before &quot;b.c.a&quot; will be different than the reverse order and that is not good to have update result being undefined and different depending on the client/tool.&lt;/p&gt;</comment>
                            <comment id="443680" author="abhishekiitg10@gmail.com" created="Mon, 21 Oct 2013 07:39:45 +0000"  >&lt;p&gt;The above update example is not correct. Consider the following update operation instead of the above one:&lt;br/&gt;
Mongo &amp;gt; db.test1.update(&lt;/p&gt;
{ a: 1}
&lt;p&gt;, {$set: { &apos;b.c&apos;: { }, &apos;b.c.a&apos;: 1 }})&lt;br/&gt;
have conflicting mods in update&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;Mongo &amp;gt; db.test1.insert(&lt;/p&gt;
{ a : 1 }
&lt;p&gt;)&lt;br/&gt;
Mongo &amp;gt; db.test1.update(&lt;/p&gt;
{ a: 1}
&lt;p&gt;, {$set: { &apos;b.c&apos;: 1, &apos;b.c.a&apos;: 1 }})&lt;br/&gt;
have conflicting mods in update&lt;/p&gt;</customfieldvalue>

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