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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>[SERVER-9442] Query results edited in javascript can create duplicate elements in the same document.</title>
                <link>https://jira.mongodb.org/browse/SERVER-9442</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After obtaining a set of documents from my MongoDB, I attempted to iterate through and add the element &quot;Name&quot; to each result, e.g.:&lt;/p&gt;

&lt;p&gt;...&lt;br/&gt;
{&lt;br/&gt;
    &quot;_id&quot; : 01234567890&lt;br/&gt;
},&lt;br/&gt;
...&lt;/p&gt;

&lt;p&gt;becomes&lt;/p&gt;

&lt;p&gt;...&lt;br/&gt;
{&lt;br/&gt;
    &quot;_id&quot; : 01234567890,&lt;br/&gt;
    &quot;Name&quot; : &quot;Joe&quot;&lt;br/&gt;
},&lt;br/&gt;
...&lt;/p&gt;

&lt;p&gt;This was run on tens of thousands of entries. It almost always worked as expected, however it occasionally (1 - 5 across the entire dataset) produced entries which looked like this:&lt;/p&gt;

&lt;p&gt;...&lt;br/&gt;
{&lt;br/&gt;
    &quot;_id&quot; : 01234567890,&lt;br/&gt;
    &quot;Name&quot; : &quot;Joe&quot;,&lt;br/&gt;
    &quot;Name&quot; : &quot;Joe&quot;&lt;br/&gt;
},&lt;br/&gt;
...&lt;/p&gt;

&lt;p&gt;This data would then cause a corrupt entry when committed back to the DB.&lt;/p&gt;

&lt;p&gt;I viewed this information printed directly from javascript, before committing back to the DB. I also noticed that if I explicitly set the variable &quot;Name&quot; twice back to back, it went ahead and duplicated the key every time, setting the values of both instances to the one most recently specified.&lt;/p&gt;

&lt;p&gt;This does not happen if I create an array of test data right in JS, it ONLY occurred when modifying the results of a MongoDB query.&lt;/p&gt;</description>
                <environment></environment>
        <key id="72884">SERVER-9442</key>
            <summary>Query results edited in javascript can create duplicate elements in the same document.</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kwingham">Kevin Wingham</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Apr 2013 20:39:30 +0000</created>
                <updated>Wed, 10 Dec 2014 23:07:01 +0000</updated>
                            <resolved>Wed, 24 Apr 2013 00:00:04 +0000</resolved>
                                    <version>2.4.1</version>
                                                    <component>JavaScript</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="320034" author="kwingham" created="Tue, 23 Apr 2013 23:51:14 +0000"  >&lt;p&gt;Yes that looks like exactly what it was! Apologies for reviving a solved bug, and thank-you for the help.&lt;/p&gt;</comment>
                            <comment id="319909" author="rassi@10gen.com" created="Tue, 23 Apr 2013 21:02:02 +0000"  >&lt;p&gt;I believe you&apos;re encountering &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9066&quot; title=&quot;Field names can be repeated in JavaScript when the same value is set multiple times&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9066&quot;&gt;&lt;del&gt;SERVER-9066&lt;/del&gt;&lt;/a&gt;, which has been fixed in version 2.4.2 of the shell.  Can you try this with the latest production release (2.4.3) of the shell and see if that fixes your issue?  It&apos;s available at &lt;a href=&quot;http://www.mongodb.org/downloads&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/downloads&lt;/a&gt;.&lt;/p&gt;</comment>
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