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<channel>
    <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-10711] $setOnInsert mods should not conflict with non-insert modifiers</title>
                <link>https://jira.mongodb.org/browse/SERVER-10711</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This command results in a conflict:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.test.update({_id:13},{$setOnInsert : {&quot;name&quot; : [null, &quot;welt&quot;]}, $set : {&quot;name.0&quot; : &quot;wooorld&quot;}}, { upsert: true });&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="89002">SERVER-10711</key>
            <summary>$setOnInsert mods should not conflict with non-insert modifiers</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="kic">kic</reporter>
                        <labels>
                            <label>insert</label>
                            <label>upsert</label>
                    </labels>
                <created>Mon, 9 Sep 2013 06:17:53 +0000</created>
                <updated>Tue, 6 Dec 2022 05:18:09 +0000</updated>
                            <resolved>Sat, 29 Jun 2019 07:53:52 +0000</resolved>
                                                                    <component>Write Ops</component>
                                        <votes>46</votes>
                                    <watches>44</watches>
                                                                                                                <comments>
                            <comment id="2305640" author="asya" created="Sat, 29 Jun 2019 07:53:32 +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 array to its new value using various aggregation array expressions based on conditional expression which can determine if the fields of interest already exist or not.   I believe this can handle all of the examples/use cases that were mentioned in the comments.&lt;/p&gt;

&lt;p&gt;Some of the examples given are no longer relevant in the world of WiredTiger but using a general example from one of the comments :&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;      {$set:{array:{$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;$a&quot;} ,  &quot;missing&quot;]}, // test if type of &quot;$a&quot; is &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:{ } ,   // it&apos;s the upsert case&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: { }    // it&apos;s the update case&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;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;You can also have multiple stages, each one referencing/testing field coming from previous stage.&lt;/p&gt;</comment>
                            <comment id="2268185" author="asya" created="Mon, 3 Jun 2019 01:28:59 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=joniba&quot; class=&quot;user-hover&quot; rel=&quot;joniba&quot;&gt;joniba&lt;/a&gt; this issue will be resolved in an upcoming version - I&apos;ll be updating the ticket with resolution later this month.&lt;/p&gt;</comment>
                            <comment id="2247135" author="joniba" created="Wed, 15 May 2019 11:21:29 +0000"  >&lt;p&gt;Looks like this issue has been forgotten. As far as I can tell there are innumerable scenarios for this feature. If a document already exists, the consumer may want to set different data than if it does not yet exist. Any plan for this feature?&lt;/p&gt;</comment>
                            <comment id="1560312" author="maganap" created="Fri, 28 Apr 2017 16:09:54 +0000"  >&lt;p&gt;@AsyaKamsky We thought to make it less expensive for the client so it can evaluate a boolean directly instead of comparing 2 date objects. Yours is of course valid, just every need is different.&lt;/p&gt;</comment>
                            <comment id="1560292" author="asya" created="Fri, 28 Apr 2017 15:52:26 +0000"  >&lt;p&gt;But then won&apos;t the field just get set to false by the very next update?   I&apos;m not sure I see this use case being applicable here.&lt;/p&gt;

&lt;p&gt;You can always set updated to timestamp and created to timestamp on insert only.  Then you can always tell if the document has been updated since it was created by comparing those two fields.&lt;/p&gt;
</comment>
                            <comment id="1560035" author="maganap" created="Fri, 28 Apr 2017 09:29:27 +0000"  >&lt;p&gt;@Asya Kamsky That&apos;s not what I meant. I don&apos;t need to know that at the time the document is upserted, but later at any time when the document is requested by the client app.  Thanks though.&lt;/p&gt;</comment>
                            <comment id="1559587" author="asya" created="Thu, 27 Apr 2017 19:27:22 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=maganap&quot; class=&quot;user-hover&quot; rel=&quot;maganap&quot;&gt;maganap&lt;/a&gt; the update command will return a document which tells you whether the document was upserted.&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;WriteResult({ &quot;nMatched&quot; : 0, &quot;nUpserted&quot; : 1, &quot;nModified&quot; : 0, &quot;_id&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;You should probably be testing that result to know if the document was updated or upserted.&lt;/p&gt;</comment>
                            <comment id="1556959" author="maganap" created="Tue, 25 Apr 2017 09:04:02 +0000"  >&lt;p&gt;Another simple use case: I need a field to be true if the document was just inserted, and to be false if it was just updated.&lt;br/&gt;
If same field exists in both $set (as false) and $setOnInsert (as true), and the document is inserted, the field in $setOnInsert should take precedence even though it exists as well in the $set section.&lt;/p&gt;</comment>
                            <comment id="1492658" author="rcardin" created="Mon, 6 Feb 2017 11:45:33 +0000"  >&lt;p&gt;We have found this &lt;em&gt;workaround&lt;/em&gt; &lt;a href=&quot;http://stackoverflow.com/a/41953190/1173755&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://stackoverflow.com/a/41953190/1173755&lt;/a&gt; until the issue is resolved.&lt;/p&gt;</comment>
                            <comment id="1237769" author="kevin.rice@searshc.com" created="Fri, 15 Apr 2016 23:24:37 +0000"  >&lt;p&gt;+1 Initialize array and put first element in it is IMPOSSIBLE with out this.&lt;br/&gt;
(can only initialize a dict and put elements in that.  Much more storage requirements).&lt;/p&gt;</comment>
                            <comment id="966688" author="flw@fotoware.com" created="Wed, 15 Jul 2015 14:32:27 +0000"  >&lt;p&gt;+1 Much more simple use case where you run into this problem:&lt;/p&gt;

&lt;p&gt;Atomically increment and get next value of a counter, creating and initializing the counter if it doesn&apos;t exist.&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.findAndModify(&quot;mydb.counters&quot;, {_id: &quot;myCounter&quot;}, {$inc: {n: 1}, $setInsert: {n, 0}}, {upsert: true, new: 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;where &quot;mydb.counters&quot; is a collection of counters, &quot;myCounter&quot; is the name of one such counter, &quot;n&quot; is the counter&apos;s value. The query above increments the counter value by 1. If it doesn&apos;t exist, the counter is initialized with 0.&lt;/p&gt;

&lt;p&gt;If this is allowed, then what should be the behavior? For the counter scenario, it would be best if only $setOnInsert (and not $inc) is applied if the counter doesn&apos;t exist. But I&apos;m note sure if this is a good general rule.&lt;/p&gt;</comment>
                            <comment id="841340" author="mstol@performr.com" created="Tue, 3 Mar 2015 08:53:31 +0000"  >&lt;p&gt;+1 - Same use case as most of the people here: Create a default value before modifying it using an upsert.&lt;/p&gt;</comment>
                            <comment id="789809" author="jtmarmon" created="Thu, 18 Dec 2014 19:14:06 +0000"  >&lt;p&gt;+1 - we get data feeds that need to either update an existing document or create a new one; however, the updates only apply to certain portions of the document.  i have to do two queries instead of one which is quite a performance hit when processing large data feeds&lt;/p&gt;</comment>
                            <comment id="777394" author="jjgreen@cisco.com" created="Wed, 3 Dec 2014 15:38:59 +0000"  >&lt;p&gt;Slightly different case, not involving $setOnInsert - I have a data model where client can add, update, delete&lt;br/&gt;
entries from an embedded array of documents.  Currently, cannot use $set for the array field along with $push&lt;br/&gt;
and/or $pull.  The only current solution is to $set the array as a whole.&lt;/p&gt;</comment>
                            <comment id="719301" author="andre.spiegel@10gen.com" created="Mon, 15 Sep 2014 20:47:31 +0000"  >&lt;p&gt;+1 for a case where you want to pre-populate an array before inserting the first value&lt;/p&gt;</comment>
                            <comment id="714660" author="dcs619" created="Tue, 9 Sep 2014 15:56:25 +0000"  >&lt;p&gt;+1 for use case creating multiple default values&lt;/p&gt;</comment>
                            <comment id="696922" author="zambonilli" created="Wed, 20 Aug 2014 15:42:37 +0000"  >&lt;p&gt;+1 running into this issue when trying to store sensor data in a time series collection.&lt;/p&gt;</comment>
                            <comment id="691959" author="thomasr" created="Fri, 15 Aug 2014 17:24:24 +0000"  >&lt;p&gt;This issue is still present in 2.6:&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;
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						&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;MongoDB shell version: 2.6.3&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;connecting to: test&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;&amp;gt; db.foo.update({_id: 1}, {$setOnInsert: {a:0, b:0}, $inc: {a:1}}, {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;&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;WriteResult({&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;nMatched&quot; : 0,&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;nUpserted&quot; : 0,&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;nModified&quot; : 0,&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;writeError&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;code&quot; : 16836,&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;errmsg&quot; : &quot;Cannot update &apos;a&apos; and &apos;a&apos; at the same time&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;	}&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;It prevents a very common use case: Initialize counters when the document does not yet exist, or else increase counters.&lt;/p&gt;</comment>
                            <comment id="691221" author="timnz" created="Thu, 14 Aug 2014 23:42:51 +0000"  >&lt;p&gt;+1 to fix this, simply ignore the $inc or have $setOnInsert override, can&apos;t be tough to do.&lt;/p&gt;</comment>
                            <comment id="542789" author="pshelby" created="Wed, 9 Apr 2014 20:24:22 +0000"  >&lt;p&gt;This is creating conflicts for my inserts as well.  A workaround would be expensive in both the database and the inserting script.&lt;/p&gt;</comment>
                            <comment id="531166" author="william.cross" created="Tue, 1 Apr 2014 17:20:15 +0000"  >&lt;p&gt;I ran into this issue as well, with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jacob.ribnik&quot; class=&quot;user-hover&quot; rel=&quot;jacob.ribnik&quot;&gt;jacob.ribnik&lt;/a&gt; while making questions for an exam. I know he&apos;s run into it, separately.&lt;/p&gt;</comment>
                            <comment id="465342" author="matthew.back@totaldefense.com" created="Wed, 4 Dec 2013 08:59:04 +0000"  >&lt;p&gt;This issue has become a problem for me.&lt;br/&gt;
I&apos;m running mongod 2.4.8 using nodeJS mongodb driver version 1.3.20 and when I run&lt;/p&gt;

&lt;p&gt;&amp;gt;db.mycollection.update({_id:{timestamp: new ISODate(&apos;2013-11-25T07:40:00Z&apos;), action:&apos;BK&apos;, protocol:&apos;http&apos;}},&lt;br/&gt;
{   $inc:&lt;/p&gt;
{&apos;value.hits&apos;:1, &apos;value.download&apos;:10, &apos;value.upload&apos;:20}
&lt;p&gt;,&lt;br/&gt;
    $setOnInsert:{value:{hits:1, dowload:10, upload:20}}&lt;br/&gt;
},&lt;/p&gt;
{upsert:true, w:1}
&lt;p&gt;)&lt;br/&gt;
in the mongo shell I also get the error &quot;have conflicting mods in update&quot; which I believe to be an incorrect error.&lt;br/&gt;
I need to find out if this fix is going to be released shortly or if I need to code a workaround.&lt;/p&gt;
</comment>
                            <comment id="459018" author="jon.rangel@10gen.com" created="Wed, 20 Nov 2013 14:33:37 +0000"  >&lt;p&gt;One use case for this is in pre-allocating documents for &lt;a href=&quot;http://docs.mongodb.org/ecosystem/use-cases/pre-aggregated-reports/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;pre-aggregated reports&lt;/a&gt;, to avoid growing documents.  The pre-allocation strategy advocated in the documentation is to allocate documents in batch up-front or probabilistically over some appropriate time interval.  The drawback with this approach is that documents may be created that are not subsequently used, and are thus a waste of space.&lt;/p&gt;

&lt;p&gt;For example, consider the following daily stats document with hourly buckets:&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;2.5.4|test&amp;gt; db.daily.update({day:6, app_id:123, event_id:456},{$setOnInsert:{counter1:0, counter2:0, hourly: [{counter1:0, counter2:0},{counter1:0, counter2:0}]}, $inc: {counter1:1, &quot;hourly.0.counter1&quot;:1}},{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;&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;Update WriteResult({&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;ok&quot; : 0,&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;code&quot; : 16844,&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;errmsg&quot; : &quot;Cannot update &apos;counter1&apos; and &apos;counter1&apos; at the same time&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;n&quot; : 0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;2.5.4|test&amp;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;In this example, a given event might not occur every day so it is undesirable to create documents for days when the event does not occur.&lt;/p&gt;</comment>
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