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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-25604] Improve readability/usefulness of $replaceRoot error messages</title>
                <link>https://jira.mongodb.org/browse/SERVER-25604</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As Asya pointed out in a comment on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23313&quot; title=&quot;Add a $replaceRoot stage which allows promoting a sub-document to the top level&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23313&quot;&gt;&lt;del&gt;SERVER-23313&lt;/del&gt;&lt;/a&gt;:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;I don&apos;t think this error message is always correct/helpful:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 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;errmsg&quot; : &quot; &apos;newRoot&apos; argument to $replaceRoot stage must evaluate to a valid Value, try ensuring that your field path(s) exist by prepending a $match: {&amp;lt;path&amp;gt;: $exists} aggregation stage.&quot;,&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;If the field (say &quot;$a&quot;) is not an object we correctly say &lt;/p&gt;
&lt;p/&gt;
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&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;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 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;try ensuring that it evaluates to an object by prepending a $match: {&amp;lt;path&amp;gt;: {$type: &apos;object&apos;}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;Is there a reason not to always say that even if the field is missing?  Also if path is missing or there but null they don&apos;t need to match, they might need to $ifNull inside newRoot, maybe to preserve document counts or fill in some default values.&lt;/p&gt;

&lt;p&gt;Also they might correct such errors via checking $type of path (in addition or instead of $ifNull) to fill in default values...&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;We should take some time to ensure these error messages are clear and helpful, without proposing a solution that might not always be ideal.&lt;/p&gt;</description>
                <environment></environment>
        <key id="308979">SERVER-25604</key>
            <summary>Improve readability/usefulness of $replaceRoot error messages</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Aug 2016 13:54:57 +0000</created>
                <updated>Sat, 19 Nov 2016 00:06:27 +0000</updated>
                            <resolved>Wed, 9 Nov 2016 23:06:00 +0000</resolved>
                                                    <fixVersion>3.4.0-rc4</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1430690" author="xgen-internal-githook" created="Wed, 9 Nov 2016 23:05:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25604&quot; title=&quot;Improve readability/usefulness of $replaceRoot error messages&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25604&quot;&gt;&lt;del&gt;SERVER-25604&lt;/del&gt;&lt;/a&gt; fix $replaceRoot error message&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0a91c903c4dee2e6cd39f0b9d6dd2b639a137aab&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0a91c903c4dee2e6cd39f0b9d6dd2b639a137aab&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="274597">SERVER-23313</issuekey>
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