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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>
    </build-info>


<item>
            <title>[DOCS-1152] Unclear how to use $cond and $ifnull aggregation operators</title>
                <link>https://jira.mongodb.org/browse/DOCS-1152</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/aggregation/#conditional-expressions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/aggregation/#conditional-expressions&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The documentation refers to &quot;boolean-expression&quot;, &quot;true-case&quot;, &quot;false-case&quot; for $cond and &quot;expression&quot;, &quot;replacement-if-null&quot; for $ifNull.&lt;/p&gt;

&lt;p&gt;Are these types strings that contain javascript expressions? Are document elements usable as inputs? If documents being aggregated on are not available, what can this be used for? A non-trivial example usage would definitely go a long way.&lt;/p&gt;</description>
                <environment></environment>
        <key id="66143">DOCS-1152</key>
            <summary>Unclear how to use $cond and $ifnull aggregation operators</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="zack.brown@10gen.com">Zack Brown</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Feb 2013 17:53:35 +0000</created>
                <updated>Thu, 26 Sep 2013 21:26:23 +0000</updated>
                            <resolved>Wed, 25 Sep 2013 20:31:22 +0000</resolved>
                                                                        <due></due>
                            <votes>3</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="431838" author="auto" created="Thu, 26 Sep 2013 15:55:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;Zackrobat&apos;, u&apos;name&apos;: u&apos;Zack Brown&apos;, u&apos;email&apos;: u&apos;zack.brown@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1152&quot; title=&quot;Unclear how to use $cond and $ifnull aggregation operators&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1152&quot;&gt;&lt;del&gt;DOCS-1152&lt;/del&gt;&lt;/a&gt;: Unclear how to use and aggregation operators&lt;/p&gt;

&lt;p&gt;Signed-off-by: Sam Kleinman &amp;lt;samk@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/1fbd54c356c7aa17091d1ece18800c23e6739b7b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/1fbd54c356c7aa17091d1ece18800c23e6739b7b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="387629" author="jkemnade" created="Wed, 24 Jul 2013 08:27:08 +0000"  >&lt;p&gt;I&apos;m currently trying to combine &lt;tt&gt;$cond&lt;/tt&gt; with &lt;tt&gt;$project&lt;/tt&gt;. I want to transform non-array values into arrays, so my expression looks something like&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   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; &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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-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;$cond&quot;: [ Array.isArray(&quot;$value&quot;), &quot;$value&quot;, [&quot;$value&quot;] ] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;From my experiments, I can tell that &lt;tt&gt;boolean-expression&lt;/tt&gt;, &lt;tt&gt;true-case&lt;/tt&gt; and &lt;tt&gt;false-case&lt;/tt&gt; are actual expressions, not strings:&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  {&quot;$cond&quot;: [ true, 1, 2 ] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;works like one would expect.&lt;br/&gt;
The question that remains is how to use values from the documents; expressions like &lt;tt&gt;&quot;$value&quot;&lt;/tt&gt; are treated as regular strings and &lt;tt&gt;this&lt;/tt&gt; is apparently an empty object.&lt;/p&gt;</comment>
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