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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>[DOCS-10622] Minor changes to update behavior in 3.6</title>
                <link>https://jira.mongodb.org/browse/DOCS-10622</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;In MongoDB 3.6, when the featureCompatibilityVersion is 3.6, we use our new update system implementation, which supports arrayFilters. This system has some minor behavior differences from 3.4 that may be worth documenting in the release notes:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Conflict detection is done at parse time, rather than update time. For example, in 3.4, the update
&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;db.c.update({_id: 0}, {$set: {a: 0}, $unset: {a: true}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt; only fails if there is a document with &lt;tt&gt;_id=0&lt;/tt&gt;, but this always fails in 3.6. In 3.4, the update&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.c.update({_id: 0}, {$set: {a: 0}, $setOnInsert: {a: 1}}, {upsert: true}) &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;only fails if there is no document with &lt;tt&gt;_id=0&lt;/tt&gt; (so a document is inserted), but this always fails in 3.6.&lt;/p&gt;&lt;/li&gt;
	&lt;li&gt;New fields are added in lexicographic order, rather than the order they appear in the update statement. For example, in 3.4, the update
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.c.update({_id: 0}, {$set: {b: 0, a: 0}})&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;updates the document {&lt;tt&gt;_id: 0&lt;/tt&gt;} to {&lt;tt&gt;_id: 0, b: 0, a: 0&lt;/tt&gt;}. In 3.6, the document will be updated to {&lt;tt&gt;_id: 0, a: 0, b: 0&lt;/tt&gt;}. (Note that since &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; is used to gate the new update system, you cannot end up with different field orderings for the document on different members of the replica set.)&lt;/p&gt;&lt;/li&gt;
	&lt;li&gt;The array filter identifier syntax is treated as an array update, rather than a fieldname. For example, in 3.4, the update
&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;db.c.update({_id: 0}, {$unset: {&quot;a.$[]&quot;: 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;updates the document {&lt;tt&gt;_id: 0, a: {&quot;$[]&quot;: 1&lt;/tt&gt;}} to {&lt;tt&gt;_id: 0&lt;/tt&gt;}. In 3.6, the update fails because &lt;tt&gt;a&lt;/tt&gt; is not an array.&lt;/p&gt;&lt;/li&gt;
	&lt;li&gt;It is illegal to remove a required part of a DBRef using &lt;tt&gt;$unset&lt;/tt&gt; or &lt;tt&gt;$rename&lt;/tt&gt;. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29819&quot; title=&quot;Can create invalid dbref using $unset, but not $set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29819&quot;&gt;&lt;del&gt;SERVER-29819&lt;/del&gt;&lt;/a&gt;.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I will leave it to the discretion of the docs team which behavior changes are worth documenting. If you have any concerns about a backwards-breaking change, or any questions, feel free to reach out.&lt;/p&gt;</description>
                <environment></environment>
        <key id="411813">DOCS-10622</key>
            <summary>Minor changes to update behavior in 3.6</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="kevin.albertson@mongodb.com">Kevin Albertson</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Aug 2017 20:41:01 +0000</created>
                <updated>Mon, 30 Oct 2023 21:08:22 +0000</updated>
                            <resolved>Mon, 23 Oct 2017 18:18:06 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1706441" author="xgen-internal-githook" created="Mon, 23 Oct 2017 18:16:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kevin.albertson@10gen.com&apos;, &apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-10622&quot; title=&quot;Minor changes to update behavior in 3.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-10622&quot;&gt;&lt;del&gt;DOCS-10622&lt;/del&gt;&lt;/a&gt; add release note about update changes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/7407291fdc17f49a035a4b096ab00d0e2d94136e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/7407291fdc17f49a035a4b096ab00d0e2d94136e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1705225" author="kevin.albertson" created="Fri, 20 Oct 2017 20:10:39 +0000"  >&lt;p&gt;Thanks Charlie. As it happens:&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;db.test.insert({a: {&quot;$[]&quot;: 1}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;doesn&apos;t work because the shell does some validation.&lt;br/&gt;
But:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.runCommand({insert: &quot;test&quot;, documents: [{&quot;a&quot;: {&quot;$[]&quot;: 1}}]})&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;does work. I&apos;ll document this behavior.&lt;/p&gt;</comment>
                            <comment id="1705097" author="charlie.swanson" created="Fri, 20 Oct 2017 18:32:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kevin.albertson&quot; class=&quot;user-hover&quot; rel=&quot;kevin.albertson&quot;&gt;kevin.albertson&lt;/a&gt; it is possible if it is inserted as a field name within a nested document. Our field validation only checks top-level fields I think, though we &lt;a href=&quot;https://docs.mongodb.com/manual/reference/limits/#Restrictions-on-Field-Names&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;document that any $-prefixed field name is disallowed&lt;/a&gt;. &lt;/p&gt;</comment>
                            <comment id="1704334" author="kevin.albertson" created="Thu, 19 Oct 2017 22:00:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt; Is it possible to insert a document with the key &quot;$[]&quot;? I was unable to in 3.4 and 3.6.&lt;/p&gt;</comment>
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