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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-20203] upsert querying an array field and $push-ing to that same field yields confusing error</title>
                <link>https://jira.mongodb.org/browse/SERVER-20203</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When attempting to query on one field of an array element, the docs make it very clear that $elemMatch is not necessary.&lt;/p&gt;

&lt;p&gt;For example, find({&quot;list.field&quot;:&quot;value&quot;}) should match the following document:  { &quot;list&quot;:[ {&quot;field&quot;:&quot;value&quot;}, {&quot;otherField&quot;:&quot;otherValue&quot;} ] }.&lt;/p&gt;

&lt;p&gt;However, doing an upsert using findAndModify on an empty collection: &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;&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; findAndModify(&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;  {&quot;list.field&quot;:&quot;value&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;  {&quot;$push&quot;:{&quot;list&quot;:{&quot;field&quot;:&quot;value&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;  {&quot;upsert&quot;:1}&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;)&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;causes the following error:&lt;br/&gt;
&quot;list&quot; must be an array but is of type Object in document {INVALID-MUTABLE-ELEMENT}&lt;/p&gt;</description>
                <environment></environment>
        <key id="227680">SERVER-20203</key>
            <summary>upsert querying an array field and $push-ing to that same field yields confusing error</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="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="evan.altman@ticketmaster.com">Evan Altman</reporter>
                        <labels>
                    </labels>
                <created>Sun, 30 Aug 2015 20:04:58 +0000</created>
                <updated>Fri, 7 Apr 2023 13:28:32 +0000</updated>
                            <resolved>Wed, 16 Sep 2015 15:44:37 +0000</resolved>
                                    <version>2.6.0</version>
                                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1029762" author="max.hirschhorn@10gen.com" created="Tue, 15 Sep 2015 04:02:57 +0000"  >&lt;p&gt;Hi Evan,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this.&lt;/p&gt;

&lt;p&gt;As you&apos;ve pointed out, the behavior of {&lt;tt&gt;&quot;list.field&quot;: value&lt;/tt&gt;} as a query predicate is different from {&lt;tt&gt;list: {$elemMatch: {field: value&lt;/tt&gt;}}} during an update or findAndModify operation when the document isn&apos;t found and &lt;tt&gt;upsert=true&lt;/tt&gt;.&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;// Success using $elemMatch.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.coll.update({list: {$elemMatch: {field: &quot;value&quot;}}}, {$push: {list: {field: &quot;value&quot;}}}, true);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.coll.findAndModify({query: {list: {$elemMatch: {field: &quot;value&quot;}}}, update: {&quot;$push&quot;: {list: {field: &quot;value&quot;}}}, upsert: true});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Failure using equality expression.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.coll.update({&quot;list.field&quot;: &quot;value&quot;}, {&quot;$push&quot;: {list: {field: &quot;value&quot;}}}, true);&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;db.coll.findAndModify({query: {&quot;list.field&quot;: &quot;value&quot;}, update: {$push: {list: {field: &quot;value&quot;}}}, upsert: true});&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;This is behavior is described in &lt;a href=&quot;#upsert-behavior&quot; target=&quot;_blank&quot; rel=&quot;noopener&quot;&gt;our documentation for upsert&lt;/a&gt;:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;The update creates the new document with [...] the fields and values of both the &lt;b&gt;&lt;tt&gt;&amp;lt;query&amp;gt;&lt;/tt&gt;&lt;/b&gt; and &lt;b&gt;&lt;tt&gt;&amp;lt;update&amp;gt;&lt;/tt&gt;&lt;/b&gt; parameters if the &lt;b&gt;&lt;tt&gt;&amp;lt;update&amp;gt;&lt;/tt&gt;&lt;/b&gt; parameter contains &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/update/#id1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;update operator&lt;/a&gt; expressions. The update creates a base document from the equality clauses in the &lt;b&gt;&lt;tt&gt;&amp;lt;query&amp;gt;&lt;/tt&gt;&lt;/b&gt; parameter, and then applies the update expressions from the &lt;b&gt;&lt;tt&gt;&amp;lt;update&amp;gt;&lt;/tt&gt;&lt;/b&gt; parameter.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Internally, a base document is constructed and then the specified update modifiers are applied to it. All equality matches of the form {&lt;tt&gt;field: value&lt;/tt&gt;} are assumed to refer to a document, even though nested fields could also refer to an array of subdocuments. Since &lt;tt&gt;$elemMatch&lt;/tt&gt; is not an equality match, no equality match is extracted from the query predicate.&lt;/p&gt;

&lt;p&gt;With regard to the previous examples, the base document {&lt;tt&gt;list: {field: &quot;value&quot;&lt;/tt&gt;}} is constructed from the query {&lt;tt&gt;&quot;list.field&quot;: &quot;value&quot;&lt;/tt&gt;} and the base document {} is constructed from the query {&lt;tt&gt;list: {$elemMatch: {field: &quot;value&quot;&lt;/tt&gt;}}}. The &lt;tt&gt;$push&lt;/tt&gt; modifier cannot be applied to the &lt;tt&gt;list&lt;/tt&gt; field because it contains a subdocument and is not an array, hence the error message. However, the &lt;tt&gt;$push&lt;/tt&gt; modifier can be applied to an empty document, which adds the field to the document as a singleton array element.&lt;/p&gt;

&lt;p&gt;Hope that helps,&lt;br/&gt;
Max&lt;/p&gt;</comment>
                            <comment id="1021967" author="samk" created="Thu, 3 Sep 2015 19:49:04 +0000"  >&lt;p&gt;Thanks for this report and sorry for the confusion. We&apos;ll get this evaluated and triaged as soon as possible.&lt;/p&gt;</comment>
                            <comment id="1017795" author="JIRAUSER1259463" created="Sun, 30 Aug 2015 20:06:55 +0000"  >&lt;p&gt;I should note that using $elemMatch for the query (instead of {list.field&quot;:&quot;value&quot;}) does work fine.&lt;/p&gt;</comment>
                    </comments>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="543379">SERVER-34973</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="45148">SERVER-6566</issuekey>
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