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    <title>MongoDB Jira</title>
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    <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-14609] Add $setOnMissing update operator</title>
                <link>https://jira.mongodb.org/browse/SERVER-14609</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Simple $add operator which similar to $set, but will no overwrite value if exists.&lt;/p&gt;</description>
                <environment></environment>
        <key id="147830">SERVER-14609</key>
            <summary>Add $setOnMissing update operator</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="miraage">Mikhail Osher</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Jul 2014 12:40:59 +0000</created>
                <updated>Tue, 6 Dec 2022 05:03:44 +0000</updated>
                            <resolved>Sat, 29 Jun 2019 08:01:34 +0000</resolved>
                                                                    <component>Write Ops</component>
                                        <votes>4</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="2305651" author="asya" created="Sat, 29 Jun 2019 08:01:34 +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 to its new value if its $type is &quot;missing&quot; and leaving it &quot;as is&quot; otherwise.&lt;/p&gt;</comment>
                            <comment id="1055967" author="markbigler" created="Thu, 8 Oct 2015 21:16:49 +0000"  >&lt;p&gt;since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1088&quot; title=&quot;set a value only if not already set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1088&quot;&gt;&lt;del&gt;SERVER-1088&lt;/del&gt;&lt;/a&gt; is already closed:&lt;/p&gt;

&lt;p&gt;+1 for this feature.&lt;/p&gt;</comment>
                            <comment id="664172" author="miraage" created="Sat, 19 Jul 2014 19:33:06 +0000"  >&lt;p&gt;Yes, I need simple $add operator like in Memcache.&lt;/p&gt;</comment>
                            <comment id="663988" author="eliot" created="Sat, 19 Jul 2014 11:22:58 +0000"  >&lt;p&gt;It is just insert, I think you want something like $setOnMissing (dne exist).&lt;/p&gt;</comment>
                            <comment id="663885" author="miraage" created="Sat, 19 Jul 2014 05:56:37 +0000"  >&lt;p&gt;Oh, I was found this operator, but I thought it only works during insert operation, not update.&lt;br/&gt;
Thanks for clarifying. &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="662994" author="eliot" created="Fri, 18 Jul 2014 12:59:16 +0000"  >&lt;p&gt;I&apos;m fairly certain $setOnInsert does what you want:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/update/setOnInsert/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/operator/update/setOnInsert/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Let us know if I missed something&lt;/p&gt;</comment>
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            <issuekey id="235859">SERVER-21094</issuekey>
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            <issuelink>
            <issuekey id="246273">SERVER-22102</issuekey>
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