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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>[SERVER-32949] lookup between local (single)value in every object and foreign (single) value and i got an empty array</title>
                <link>https://jira.mongodb.org/browse/SERVER-32949</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;db.Tasks.aggregate([ {&lt;br/&gt;
    $lookup: &lt;/p&gt;
{
           from: &quot;Userdata&quot;,
           localField: &quot;customer_id&quot;,  
           foreignField: &quot;_id&quot;,
           as: &quot;userdetails&quot;
    }
&lt;p&gt;} ]&lt;/p&gt;

&lt;p&gt;here i get the empty array of userdetails .&lt;br/&gt;
please check i gave the response below.&lt;br/&gt;
&lt;ins&gt;response:&lt;/ins&gt;&lt;br/&gt;
[&lt;br/&gt;
    &lt;/p&gt;
{
        &quot;_id&quot;: &quot;5a6ecde19f3a0d31f4cd5b5e&quot;,
        &quot;executive_id&quot;: &quot;5a6ec6879a3e3406f8f7d70b&quot;,
        &quot;customer_id&quot;: &quot;5a5495b1a03790158019a7d5&quot;,
        &quot;task_completed&quot;: false,
        &quot;__v&quot;: 0,
        &quot;userdeatails&quot;: []
    }
&lt;p&gt;,&lt;br/&gt;
    &lt;/p&gt;
{
        &quot;_id&quot;: &quot;5a6ecdf29f3a0d31f4cd5b5f&quot;,
        &quot;executive_id&quot;: &quot;5a6ec6879a3e3406f8f7d70b&quot;,
        &quot;customer_id&quot;: &quot;5a5495b1a03790158019a7d5&quot;,
        &quot;task_completed&quot;: false,
        &quot;__v&quot;: 0,
        &quot;userdeatails&quot;: []
    }
&lt;p&gt;,&lt;br/&gt;
    &lt;/p&gt;
{
        &quot;_id&quot;: &quot;5a6ece0d9f3a0d31f4cd5b60&quot;,
        &quot;executive_id&quot;: &quot;5a6ec6879a3e3406f8f7d70b&quot;,
        &quot;customer_id&quot;: &quot;5a67055d611e836db9078ca3&quot;,
        &quot;task_completed&quot;: false,
        &quot;__v&quot;: 0,
        &quot;userdeatails&quot;: []
    }
&lt;p&gt;,&lt;/p&gt;
    {
        &quot;_id&quot;: &quot;5a6ed8829f3a0d31f4cd5b61&quot;,
        &quot;executive_id&quot;: &quot;5a6ec822c2eee725f8282b3c&quot;,
        &quot;customer_id&quot;: &quot;5a67055d611e836db9078ca3&quot;,
        &quot;task_completed&quot;: false,
        &quot;__v&quot;: 0,
        &quot;userdeatails&quot;: []
    }
&lt;p&gt;]&lt;/p&gt;</description>
                <environment></environment>
        <key id="488589">SERVER-32949</key>
            <summary>lookup between local (single)value in every object and foreign (single) value and i got an empty array</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="bruce.lucas@mongodb.com">Bruce Lucas</assignee>
                                    <reporter username="nithinakula">nithin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Jan 2018 09:58:14 +0000</created>
                <updated>Wed, 28 Feb 2018 04:32:59 +0000</updated>
                            <resolved>Mon, 5 Feb 2018 16:57:23 +0000</resolved>
                                    <version>3.6.1</version>
                                                    <component>JavaScript</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1790098" author="nithinakula" created="Wed, 31 Jan 2018 04:22:37 +0000"  >&lt;p&gt;k thank you&lt;/p&gt;</comment>
                            <comment id="1787578" author="bruce.lucas@10gen.com" created="Mon, 29 Jan 2018 14:25:40 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;The empty userdetails array indicates that there are no documents in Userdata with an _id matching that customer_id. To check whether this is correct please execute the following:&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;    result = db.Tasks.aggregate([{&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;   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;        $lookup: {&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;   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;            from: &quot;Userdata&quot;,&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;   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;            localField: &quot;customer_id&quot;,&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;   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;            foreignField: &quot;_id&quot;,&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;   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;            as: &quot;userdetails&quot; }&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;   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;    }]).next()&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;   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;    printjson(result)&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;   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;    check = db.Userdata.findOne({_id: result.customer_id})&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;    printjson(check)&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;If this shows that the result of the $lookup is erroneous then we can investigate further.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Bruce&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="177079" name="tasks.png" size="155438" author="nithinakula" created="Mon, 29 Jan 2018 09:58:45 +0000"/>
                            <attachment id="177080" name="userdata.png" size="7568" author="nithinakula" created="Mon, 29 Jan 2018 09:58:45 +0000"/>
                    </attachments>
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