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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-1088] set a value only if not already set</title>
                <link>https://jira.mongodb.org/browse/SERVER-1088</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I suggest a feature that allows to set a value to a field only if it is not already defined.&lt;br/&gt;
This could be similar to $addToSet and might be called $init:&lt;/p&gt;

&lt;p&gt;db.users.insert(&lt;/p&gt;
{uid: 15, name: &quot;myname&quot;}
&lt;p&gt;)&lt;br/&gt;
db.users.update(&lt;/p&gt;
{uid: 15}
&lt;p&gt;, { $init : &lt;/p&gt;
{ status : &quot;offline&quot; }
&lt;p&gt; }&lt;br/&gt;
// the status field wasn&apos;t set so it is initialized&lt;/p&gt;
{uid: 15, name: &quot;myname&quot;, status: &quot;offline&quot;}

&lt;p&gt;db.users.update(&lt;/p&gt;
{uid: 15}
&lt;p&gt;, { $set : &lt;/p&gt;
{ status : &quot;online&quot; }
&lt;p&gt; }&lt;br/&gt;
db.users.update(&lt;/p&gt;
{uid: 15}
&lt;p&gt;, { $init : &lt;/p&gt;
{ status : &quot;offline&quot; }
&lt;p&gt; }&lt;br/&gt;
// no effect because the status field was already set.&lt;/p&gt;
{uid: 15, name: &quot;myname&quot;, status: &quot;online&quot;}

&lt;p&gt;Note that $not and $exists won&apos;t help in case you want to set some fields and init others:&lt;br/&gt;
db.users.update(&lt;/p&gt;
{uid: 15}
&lt;p&gt;, { $init : &lt;/p&gt;
{status : &quot;offline&quot; }
&lt;p&gt;, $set: &lt;/p&gt;
{age: 23}
&lt;p&gt; }&lt;/p&gt;</description>
                <environment></environment>
        <key id="11900">SERVER-1088</key>
            <summary>set a value only if not already set</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="pablo">pablo platt</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 May 2010 18:43:26 +0000</created>
                <updated>Tue, 6 Dec 2022 05:49:30 +0000</updated>
                            <resolved>Sat, 29 Jun 2019 07:28:40 +0000</resolved>
                                                                    <component>Write Ops</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2305624" author="asya" created="Sat, 29 Jun 2019 07:28:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40381&quot; title=&quot;Add the ability to specify a pipeline to an update command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40381&quot;&gt;&lt;del&gt;SERVER-40381&lt;/del&gt;&lt;/a&gt; implemented support for aggregation expressions to specify update for 4.2.&#160;&lt;/p&gt;

&lt;p&gt;You can see some examples &lt;a href=&quot;https://docs.mongodb.com/master/reference/command/update/index.html#update-command-example-agg&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here.&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This can be done by setting the field conditionally using various aggregation array expressions.&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.c.update({}, [&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;      {$set:{newField:{$cond:{&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;            if: {$eq:[ {$type:&quot;$newField&quot;} ,  &quot;missing&quot; ]},&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            then: &amp;lt;newValue&amp;gt;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            else: &quot;$newField&quot;    // keep existing value&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;      }}}}&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;Even simpler, if you consider &lt;tt&gt;null&lt;/tt&gt; is the same as &lt;tt&gt;missing&lt;/tt&gt; you can &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.c.update({}, [&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;   {$set:{ newField:{$ifNull: [ &quot;$newField&quot;, &amp;lt;newValue&amp;gt; ] } } }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;]);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/p&gt;</comment>
                            <comment id="2017125" author="gfarniev" created="Fri, 28 Sep 2018 02:16:46 +0000"  >&lt;p&gt;+1 for this feature, it could save tons of time when working with complex updates&lt;/p&gt;</comment>
                            <comment id="1869448" author="julien_c" created="Thu, 19 Apr 2018 21:05:54 +0000"  >&lt;p&gt;Yes, this should actually be called `$setOnce` (it&apos;s what it&apos;s called in other document dbs)&lt;/p&gt;</comment>
                            <comment id="908547" author="s.churikov" created="Fri, 8 May 2015 12:27:41 +0000"  >&lt;p&gt;+1 for this feature. It cannot be replaced with setOnInsert... I have few places in my project where such update could solve double trip in DB...&lt;/p&gt;</comment>
                            <comment id="803476" author="ppizarro" created="Tue, 13 Jan 2015 17:04:52 +0000"  >&lt;p&gt;$setOnInsert (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-340&quot; title=&quot;$setOnInsert modifier for upsert&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-340&quot;&gt;&lt;del&gt;SERVER-340&lt;/del&gt;&lt;/a&gt;) does not solve the above problem.&lt;/p&gt;

&lt;p&gt;Example:&lt;/p&gt;

&lt;p&gt;Consider a collection &apos;test&apos; with the following document:&lt;/p&gt;

{ &quot;_id&quot; : ObjectId(&quot;54b54cca3fe00ba1fdab647a&quot;), &quot;a&quot; : 1, &quot;c&quot; : 3 }

&lt;p&gt;After you run the command:&lt;/p&gt;

&lt;p&gt;db.test.update(&lt;/p&gt;
{ _id: ObjectId(&quot;54b54cca3fe00ba1fdab647a&quot;) }
&lt;p&gt;, { $set: &lt;/p&gt;
{ a: 2 }
&lt;p&gt;, $setOnInsert: &lt;/p&gt;
{ b:2 }
&lt;p&gt; }, &lt;/p&gt;
{ upsert:true }
&lt;p&gt;);&lt;/p&gt;

&lt;p&gt;Only the field &apos;a&apos; was updated because the document already exists the $setOnInsert command is not executed.&lt;/p&gt;

&lt;p&gt;We would like to a command to execute only if the FIELD does not exist and not the document.&lt;/p&gt;
</comment>
                            <comment id="14049" author="eliot" created="Tue, 4 May 2010 19:15:18 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-340&quot; title=&quot;$setOnInsert modifier for upsert&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-340&quot;&gt;&lt;del&gt;SERVER-340&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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