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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-2643] Add direct comparison of $ vs $elemMatch usage</title>
                <link>https://jira.mongodb.org/browse/DOCS-2643</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The differences between the &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/projection/positional/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$ projection operator&lt;/a&gt; and &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/projection/positional/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$elemMatch projection operator&lt;/a&gt; could be better explained.&lt;/p&gt;

&lt;p&gt;We do mention the &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/projection/positional/#array-field-limitation&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;array field limitation&lt;/a&gt; for &lt;tt&gt;$&lt;/tt&gt;, but in the &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/projection/elemMatch/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$elemMatch notes&lt;/a&gt; it just says &quot;The $elemMatch projection operator is similar to the positional $ projection operator&quot;.&lt;/p&gt;

&lt;p&gt;To further confuse things, the &lt;tt&gt;$elemMatch&lt;/tt&gt; operator can be used in queries and the &lt;tt&gt;$&lt;/tt&gt; can be used in updates.&lt;/p&gt;

&lt;p&gt;Perhaps we can do some sort of direct comparison table/summary?&lt;/p&gt;

&lt;p&gt;Possible starting point: &lt;a href=&quot;http://stackoverflow.com/questions/21519185/projection-vs-elemmatch&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://stackoverflow.com/questions/21519185/projection-vs-elemmatch&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="109185">DOCS-2643</key>
            <summary>Add direct comparison of $ vs $elemMatch usage</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="andrew.aldridge@mongodb.com">Andrew Aldridge</assignee>
                                    <reporter username="stephen.steneker@mongodb.com">Stennie Steneker</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 Feb 2014 05:44:48 +0000</created>
                <updated>Mon, 16 Mar 2015 23:56:59 +0000</updated>
                            <resolved>Fri, 12 Sep 2014 21:48:03 +0000</resolved>
                                                    <fixVersion>v1.3.11</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="718228" author="xgen-internal-githook" created="Fri, 12 Sep 2014 21:43:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;i80and&apos;, u&apos;name&apos;: u&apos;Andrew Aldridge&apos;, u&apos;email&apos;: u&apos;i80and@foxquill.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2643&quot; title=&quot;Add direct comparison of $ vs $elemMatch usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2643&quot;&gt;&lt;del&gt;DOCS-2643&lt;/del&gt;&lt;/a&gt;: Clarify distinction between positional $ and projection $elemMatch.&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/33717f9b6af689f534e2f4329e6fc569bd8880ca&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/33717f9b6af689f534e2f4329e6fc569bd8880ca&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="718219" author="xgen-internal-githook" created="Fri, 12 Sep 2014 21:35:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;i80and&apos;, u&apos;name&apos;: u&apos;Andrew Aldridge&apos;, u&apos;email&apos;: u&apos;i80and@foxquill.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2643&quot; title=&quot;Add direct comparison of $ vs $elemMatch usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2643&quot;&gt;&lt;del&gt;DOCS-2643&lt;/del&gt;&lt;/a&gt;: Clarify distinction between positional $ and projection $elemMatch.&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/138d45b14564f96d9aa63d17a3a8502d53686f93&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/138d45b14564f96d9aa63d17a3a8502d53686f93&lt;/a&gt;&lt;/p&gt;</comment>
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