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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-2860] findAndModify behaviour unexpected for upsert scenarios</title>
                <link>https://jira.mongodb.org/browse/SERVER-2860</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This returns an empty document rather than null/nothing :&lt;br/&gt;
db.test.findAndModify({query: &lt;/p&gt;
{a:1}
&lt;p&gt;, update : {$set : { a:2}}, fields: &lt;/p&gt;
{tasks:1}
&lt;p&gt;, upsert:true} )&lt;/p&gt;

&lt;p&gt;This returns a document with only the _id set rather than the entire newly inserted document :&lt;br/&gt;
db.test.findAndModify({query: &lt;/p&gt;
{a:1}
&lt;p&gt;, update : {$set : { a:2}}, fields: &lt;/p&gt;
{tasks:1}
&lt;p&gt;, upsert:true, new: true } )&lt;/p&gt;

&lt;p&gt;Is this intended? If so, is it useful to open a JIRA issue to change this?&lt;/p&gt;</description>
                <environment></environment>
        <key id="15358">SERVER-2860</key>
            <summary>findAndModify behaviour unexpected for upsert scenarios</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="remonvv">Remon van Vliet</reporter>
                        <labels>
                    </labels>
                <created>Tue, 29 Mar 2011 11:19:32 +0000</created>
                <updated>Tue, 29 May 2012 14:53:26 +0000</updated>
                            <resolved>Mon, 4 Apr 2011 16:56:53 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="27800" author="remonvv" created="Tue, 5 Apr 2011 09:29:25 +0000"  >&lt;p&gt;Hi Mathias,&lt;/p&gt;

&lt;p&gt;Okay, sounds reasonable enough. I wasn&apos;t sure hence reporting it as a question. And I totally missed that I still had a &lt;/p&gt;
{fields:..}
&lt;p&gt; clause in my example which completely explains the second scenario. Oops &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/wink.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="27703" author="redbeard0531" created="Mon, 4 Apr 2011 16:56:53 +0000"  >&lt;p&gt;This is related to &lt;a href=&quot;http://jira.mongodb.org/browse/SERVER-2757&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;http://jira.mongodb.org/browse/SERVER-2757&lt;/a&gt;, but the behavior you are seeing is fully expected (at least for now).&lt;/p&gt;

&lt;p&gt;The reason for the null/{} distinction is that with upsert:false, there is no old OR new object so I consider this an error and return null. If upsert is true then the old object is {}, which isn&apos;t possible in any other case unless you filter out _id.&lt;/p&gt;

&lt;p&gt;The new object with upsert:true should be the full new object. However, you have {fields:{tasks:1}} set which filters out all fields other than _id since there is no tasks field. If you remove the fields option or set {fields: {a:1}} you should see the full object.&lt;/p&gt;</comment>
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