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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-14837] Positional Operator matching wrong nested document</title>
                <link>https://jira.mongodb.org/browse/SERVER-14837</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When upgrading from mongo 2.4 to 2.6 the positional operator is matching the incorrect sub document. This causes an update query to incorrectly update the wrong value. The query supplied was produced by Mongoid when using doubly nested models. &lt;a href=&quot;https://github.com/mongoid/mongoid/issues/3611&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongoid/mongoid/issues/3611&lt;/a&gt; is the reported issue.&lt;/p&gt;</description>
                <environment></environment>
        <key id="151486">SERVER-14837</key>
            <summary>Positional Operator matching wrong nested document</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="3">Duplicate</resolution>
                                        <assignee username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="ismell">Raul E Rangel</reporter>
                        <labels>
                    </labels>
                <created>Fri, 8 Aug 2014 15:26:17 +0000</created>
                <updated>Tue, 17 Feb 2015 13:00:22 +0000</updated>
                            <resolved>Wed, 3 Sep 2014 17:20:31 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="732362" author="ismell" created="Thu, 2 Oct 2014 12:48:24 +0000"  >&lt;p&gt;Just for people looking at this ticket. There is another ticket that is currently open: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14886&quot; title=&quot;Updates against paths composed with array index notation and positional operator fail with error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14886&quot;&gt;&lt;del&gt;SERVER-14886&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="710851" author="ramon.fernandez" created="Wed, 3 Sep 2014 18:30:45 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ismell&quot; class=&quot;user-hover&quot; rel=&quot;ismell&quot;&gt;ismell&lt;/a&gt;, unfortunately I don&apos;t think is possible to have the same query work for 2.4 and 2.6 if the query has multiple predicates over arrays. For 2.6 you may want to rely on the deterministic, documented behavior. If you want to explore further options you could post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. A question like this involving more discussion would be best posted on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="710716" author="ismell" created="Wed, 3 Sep 2014 17:34:33 +0000"  >&lt;p&gt;Hey Ram&#243;n,&lt;br/&gt;
Mongoid will always generate the query from least specific to most specific criteria. It will never swap the more specific criteria with a lesser one. The expected behavior would be that the positional operator matches the most specific criteria.&lt;/p&gt;

&lt;p&gt;Do you have a recommendation on how Mongoid should write the query so that it will work for both 2.4 and 2.6?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Raul&lt;/p&gt;</comment>
                            <comment id="710702" author="ramon.fernandez" created="Wed, 3 Sep 2014 17:19:41 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ismell&quot; class=&quot;user-hover&quot; rel=&quot;ismell&quot;&gt;ismell&lt;/a&gt;, the value of the positional operator when a query has multiple predicates over array fields may be ambiguous in 2.4. In your use case, when you query for&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  &quot;_id&quot;:ObjectId(&apos;53e29d8473636f0664000000&apos;),&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;the positional operator takes the value 0 as you were expecting, but note that if you change the order of the predicates as follows&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;the positional operator takes the value 2, so if you&apos;re using 2.4 you should be aware of this behavior. In 2.6 the value of the positional operator in these cases was made deterministic &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/update/positional/#update&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;as described in the documentation&lt;/a&gt;, which explains the behavior you describe.&lt;/p&gt;

&lt;p&gt;That being said, this same issue has been reported before in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14662&quot; title=&quot;Positional projection queries (and positional update ops) should fail with error if multiple arrays encountered&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14662&quot;&gt;&lt;del&gt;SERVER-14662&lt;/del&gt;&lt;/a&gt; and there may be some room for improvement, so please tune in to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14662&quot; title=&quot;Positional projection queries (and positional update ops) should fail with error if multiple arrays encountered&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14662&quot;&gt;&lt;del&gt;SERVER-14662&lt;/del&gt;&lt;/a&gt; for further updates.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="148596">SERVER-14662</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="184548">SERVER-17301</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="96848">SERVER-11537</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="152412">SERVER-14886</issuekey>
        </issuelink>
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                            <customfieldvalue>&lt;p&gt;I&apos;ve put together a gist that can be used to reproduce the problem: &lt;a href=&quot;https://gist.github.com/ismell/9ae5a9798ae82a1a85de&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gist.github.com/ismell/9ae5a9798ae82a1a85de&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;As you can see in the results for 2.4 and 2.6 it&apos;s selecting the wrong sub document. It seems like its using the index of the dimensions array as the positional index instead of the position matched by the values._id clause.&lt;/p&gt;</customfieldvalue>

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