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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-7894] A $setOnChange command would be very helpful</title>
                <link>https://jira.mongodb.org/browse/SERVER-7894</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the same light as $setOnInsert, $setOnChange would also be incredibly helpful and allow developers to reduce the amount of code they have to write.&lt;/p&gt;</description>
                <environment></environment>
        <key id="58873">SERVER-7894</key>
            <summary>A $setOnChange command would be very helpful</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="rn@deftlabs.com">Ryan Nitz</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Dec 2012 20:22:24 +0000</created>
                <updated>Wed, 7 Aug 2013 20:18:29 +0000</updated>
                            <resolved>Tue, 11 Dec 2012 05:02:51 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="211574" author="rgnitz" created="Mon, 10 Dec 2012 23:01:12 +0000"  >&lt;p&gt;Ok, I did not realize that the server checks to see if the specific/individual field value changed... I thought that it just overwrote anything that was previously there.&lt;/p&gt;

&lt;p&gt;I am looking for a way to issue updates for infrequently changing data that has the least amount of impact on the server.&lt;/p&gt;</comment>
                            <comment id="211549" author="eliot" created="Mon, 10 Dec 2012 22:43:31 +0000"  >&lt;p&gt;Your example above is what happens already, so I&apos;m totally confused.&lt;/p&gt;</comment>
                            <comment id="211473" author="rgnitz" created="Mon, 10 Dec 2012 21:22:34 +0000"  >&lt;p&gt;Yep... that works too. I am not married to any particular name &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="211461" author="scotthernandez" created="Mon, 10 Dec 2012 21:09:09 +0000"  >&lt;p&gt;Something like $setIfDifferent?&lt;/p&gt;</comment>
                            <comment id="211448" author="rgnitz" created="Mon, 10 Dec 2012 20:58:10 +0000"  >&lt;p&gt;I think the upsert/insert case would be valid too. The previous value is null/non-existant.&lt;/p&gt;</comment>
                            <comment id="211435" author="scotthernandez" created="Mon, 10 Dec 2012 20:51:07 +0000"  >&lt;p&gt;So you want to specify operations that only happen during the update case, not insert (if upsert is true)? Currently all operation happen independent of the method (update/insert).&lt;/p&gt;</comment>
                            <comment id="211420" author="rgnitz" created="Mon, 10 Dec 2012 20:32:51 +0000"  >&lt;p&gt;$setOnChange might be a bad name... $updateOnChange?&lt;/p&gt;</comment>
                            <comment id="211415" author="rgnitz" created="Mon, 10 Dec 2012 20:29:02 +0000"  >&lt;p&gt;In a nutshell, mongo would only change the field value if it differs from what is in place.&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;db.test.insert({ version : &apos;2.2.1&apos;});&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.test.find()&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;_id&quot; : ObjectId(&quot;50c64555731fb8c3d259f5f3&quot;), &quot;version&quot; : &quot;2.2.1&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;The following would &lt;b&gt;not&lt;/b&gt; change the field (&quot;version&quot;) value:&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.update({_id : ObjectId(&quot;50c64555731fb8c3d259f5f3&quot;), { $setOnChange : { version : &apos;2.2.1&apos;}}, false, false);&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;The following &lt;b&gt;would&lt;/b&gt; change the field (&quot;version&quot;) value because it is different from what is in place:&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.update({_id : ObjectId(&quot;50c64555731fb8c3d259f5f3&quot;), { $setOnChange : { version : &apos;2.2.2&apos;}}, false, false);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                    </comments>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="10706">SERVER-340</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="45148">SERVER-6566</issuekey>
        </issuelink>
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