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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-1640] $in operator for behaves unexpected on upserts</title>
                <link>https://jira.mongodb.org/browse/SERVER-1640</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We would like to reduce the number of updates by using the $in operator going from&lt;/p&gt;

&lt;p&gt;  buckets = [ &apos;2010&apos;, &apos;2010-08&apos;, &apos;2010-08-01&apos; ]&lt;br/&gt;
  buckets.each do |bucket|&lt;br/&gt;
    @totals.update(&lt;/p&gt;
{ &apos;bucket&apos; =&amp;gt; bucket }
&lt;p&gt;, { &apos;$inc&apos; =&amp;gt; { &apos;downloads&apos; =&amp;gt; 1 }}, :upsert =&amp;gt; true)&lt;br/&gt;
  end&lt;/p&gt;

&lt;p&gt;to&lt;/p&gt;

&lt;p&gt;  buckets = [ &apos;2010&apos;, &apos;2010-08&apos;, &apos;2010-08-01&apos; ]&lt;br/&gt;
  @totals.update({ &apos;bucket&apos; =&amp;gt; &lt;/p&gt;
{ &quot;$in&quot; =&amp;gt; buckets }
&lt;p&gt; }, { &apos;$inc&apos; =&amp;gt; { &apos;downloads&apos; =&amp;gt; 1 }}, :upsert =&amp;gt; true)&lt;/p&gt;

&lt;p&gt;Unfortunately we get very strange and inconsistent results.&lt;/p&gt;

&lt;p&gt;    db.test.find()&lt;br/&gt;
    db.test.update(&lt;/p&gt;
{&quot;b&quot;: 2}
&lt;p&gt;, { &quot;$inc&quot;: &lt;/p&gt;
{ &quot;d&quot;: 1 }
&lt;p&gt; }, true)&lt;br/&gt;
    db.test.find()&lt;/p&gt;

    { &quot;_id&quot; : ObjectId(&quot;4c6d1e345153667a3fd349b8&quot;), &quot;b&quot; : 2, &quot;d&quot; : 1 }

&lt;p&gt;    db.test.update(&lt;/p&gt;
{&quot;b&quot;: 3}
&lt;p&gt;, { &quot;$inc&quot;: &lt;/p&gt;
{ &quot;d&quot;: 1 }
&lt;p&gt; }, true)&lt;br/&gt;
    db.test.find()&lt;/p&gt;

    { &quot;_id&quot; : ObjectId(&quot;4c6d1e345153667a3fd349b8&quot;), &quot;b&quot; : 2, &quot;d&quot; : 1 }
    { &quot;_id&quot; : ObjectId(&quot;4c6d1e485153667a3fd349b9&quot;), &quot;b&quot; : 3, &quot;d&quot; : 1 }

&lt;p&gt;    db.test.update({&quot;b&quot;: &lt;/p&gt;
{ &quot;$in&quot;: [ 2, 3, 4 ] }
&lt;p&gt; }, { &quot;$inc&quot;: &lt;/p&gt;
{ &quot;d&quot;: 1 }
&lt;p&gt; }, true)&lt;br/&gt;
    db.test.find()&lt;/p&gt;

    { &quot;_id&quot; : ObjectId(&quot;4c6d1e345153667a3fd349b8&quot;), &quot;b&quot; : 2, &quot;d&quot; : 2 }
    { &quot;_id&quot; : ObjectId(&quot;4c6d1e485153667a3fd349b9&quot;), &quot;b&quot; : 3, &quot;d&quot; : 1 }

&lt;p&gt;We would expect also&lt;/p&gt;

    { &quot;_id&quot; : ObjectId(&quot;4c6d1e485153667a3fd349ba&quot;), &quot;b&quot; : 4, &quot;d&quot; : 1 }

&lt;p&gt;to be there. Then we found there is &apos;multi&apos; option to turn on in (from &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Updating&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Updating&lt;/a&gt; )&lt;/p&gt;

&lt;p&gt; &quot;multi - if all documents matching criteria should be updated&quot;&lt;/p&gt;

&lt;p&gt;But that still does not create a documents as expected.&lt;/p&gt;

&lt;p&gt;    db.test.update({&quot;b&quot;: &lt;/p&gt;
{ &quot;$in&quot;: [ 2, 3, 4 ] }
&lt;p&gt; }, { &quot;$inc&quot;: &lt;/p&gt;
{ &quot;d&quot;: 1 }
&lt;p&gt; }, true, true)&lt;br/&gt;
    db.test.find()&lt;/p&gt;

    { &quot;_id&quot; : ObjectId(&quot;4c6d1e345153667a3fd349b8&quot;), &quot;b&quot; : 2, &quot;d&quot; : 3 }
    { &quot;_id&quot; : ObjectId(&quot;4c6d1e485153667a3fd349b9&quot;), &quot;b&quot; : 3, &quot;d&quot; : 2 }

&lt;p&gt;Now even more weird. Trying again it does create a document - but not the one expected:&lt;/p&gt;

&lt;p&gt;    db.test.update({&quot;b&quot;: &lt;/p&gt;
{ &quot;$in&quot;: [ 55, 66 ] }
&lt;p&gt; }, { &quot;$inc&quot;: &lt;/p&gt;
{ &quot;d&quot;: 1 }
&lt;p&gt; }, true, true) &lt;br/&gt;
    db.test.find()                                                                   &lt;/p&gt;

    { &quot;_id&quot; : ObjectId(&quot;4c6d1e345153667a3fd349b8&quot;), &quot;b&quot; : 2, &quot;d&quot; : 3 }
    { &quot;_id&quot; : ObjectId(&quot;4c6d1e485153667a3fd349b9&quot;), &quot;b&quot; : 3, &quot;d&quot; : 2 }
    { &quot;_id&quot; : ObjectId(&quot;4c6d1f1a5153667a3fd349ba&quot;), &quot;d&quot; : 1 }

&lt;p&gt;What are we missing here?&lt;/p&gt;</description>
                <environment>any</environment>
        <key id="12835">SERVER-1640</key>
            <summary>$in operator for behaves unexpected on upserts</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="tcurdt">Torsten Curdt</reporter>
                        <labels>
                    </labels>
                <created>Thu, 19 Aug 2010 12:14:50 +0000</created>
                <updated>Fri, 7 Mar 2014 00:03:16 +0000</updated>
                            <resolved>Thu, 19 Aug 2010 13:16:49 +0000</resolved>
                                    <version>1.6.1</version>
                                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="17041" author="eliot" created="Thu, 19 Aug 2010 14:19:06 +0000"  >&lt;p&gt;In the last piece, it is supposed to do an upsert because the query doesn&apos;t match anything.&lt;/p&gt;</comment>
                            <comment id="17040" author="eliot" created="Thu, 19 Aug 2010 14:16:49 +0000"  >&lt;p&gt;You can&apos;t combine a multi-update and an upsert.&lt;/p&gt;

&lt;p&gt;You can do a query with $in and figure out which objects need to inserted, and then do an multi-update on the others.&lt;/p&gt;

&lt;p&gt;But i think you&apos;re better of jusing doing multiple upserts in your code&lt;/p&gt;</comment>
                            <comment id="17038" author="tcurdt" created="Thu, 19 Aug 2010 14:13:45 +0000"  >&lt;p&gt;...and why is it creating &lt;/p&gt;

{ &quot;_id&quot; : ObjectId(&quot;4c6d1f1a5153667a3fd349ba&quot;), &quot;d&quot; : 1 } 

&lt;p&gt;then? according to you that should not happen either.&lt;/p&gt;</comment>
                            <comment id="17036" author="tcurdt" created="Thu, 19 Aug 2010 14:12:30 +0000"  >&lt;p&gt;Got at better way to combine the multiple updates in one then?&lt;/p&gt;</comment>
                            <comment id="17031" author="eliot" created="Thu, 19 Aug 2010 13:16:49 +0000"  >&lt;p&gt;If you use upsert with multi, if any docs match, nothing will be created.&lt;/p&gt;

&lt;p&gt;Think about the case where you say update( { x : &lt;/p&gt;
{ $gt : 5 }
&lt;p&gt; } )&lt;br/&gt;
we wouldn&apos;t want to create a value for every possible value of x&lt;/p&gt;</comment>
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