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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>[CSHARP-4802] Find projection of nested field does not compute dotted field name properly</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4802</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;

&lt;p&gt;&lt;em&gt;Driver Version: 2.21.0; No issue up to 2.20.0;&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;MongoDB Version: 6.0.10&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;When projecting a search result to the Id field of a nested document, the top-level Id field is returned.&lt;/p&gt;

&lt;p&gt;See the following (simplified) example.&lt;/p&gt;

&lt;p&gt;Expected: subDocumentId contains the value of the Id field of SubDocument.&lt;/p&gt;

&lt;p&gt;Actual: subDocumentId contains the value of the Id field of Document.&lt;/p&gt;

&lt;p&gt;Up to driver version 2.20.0, this works as expected.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;public class BusinessLogic&lt;br/&gt;
{&lt;br/&gt;
&#160; &#160; public async Task&amp;lt;ObjectId&amp;gt; GetSubDocumentId()&lt;br/&gt;
&#160; &#160; &lt;/p&gt;
{
&#160; &#160; &#160; &#160; var subDocumentId = await _dbContext.Documents.Find(d =&amp;gt; d.Status == status)
&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; .Project(d =&amp;gt; d.PairedSwitchingDevice.Id)
&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; .FirstOrDefaultAsync();

&#160; &#160; &#160; &#160; return subDocumentId;
&#160; &#160; }
&lt;p&gt;}&lt;/p&gt;

&lt;p&gt;public class Document&lt;/p&gt;
{
&#160; &#160; [BsonId]
&#160; &#160; public ObjectId Id \{ get; set; }

&lt;p&gt;&#160; &#160; &lt;span class=&quot;error&quot;&gt;&amp;#91;BsonElement(&amp;quot;Status&amp;quot;)&amp;#93;&lt;/span&gt;&lt;br/&gt;
&#160; &#160; public string Status { get; set; }&lt;/p&gt;

&lt;p&gt;&#160; &#160; &lt;span class=&quot;error&quot;&gt;&amp;#91;BsonElement(&amp;quot;SubDocument&amp;quot;)&amp;#93;&lt;/span&gt;&lt;br/&gt;
&#160; &#160; public SubDocument SubDocument { get; set; }&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;public class SubDocument&lt;/p&gt;
{
&#160; &#160; [BsonElement(&quot;Id&quot;)]
&#160; &#160; public ObjectId Id \{ get; set; }
&lt;p&gt;}&lt;/p&gt;</description>
                <environment></environment>
        <key id="2449189">CSHARP-4802</key>
            <summary>Find projection of nested field does not compute dotted field name properly</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="13201">Fixed</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="henning.brands@festo.com">Henning Brands</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Sep 2023 15:27:50 +0000</created>
                <updated>Sat, 28 Oct 2023 11:46:46 +0000</updated>
                            <resolved>Wed, 27 Sep 2023 22:49:32 +0000</resolved>
                                    <version>2.21.0</version>
                                    <fixVersion>2.22.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5736196" author="xgen-internal-githook" created="Wed, 27 Sep 2023 22:48:59 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;rstam&apos;, &apos;email&apos;: &apos;robert@robertstam.org&apos;, &apos;username&apos;: &apos;rstam&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4802&quot; title=&quot;Find projection of nested field does not compute dotted field name properly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4802&quot;&gt;&lt;del&gt;CSHARP-4802&lt;/del&gt;&lt;/a&gt;: Projection of nested field does not compute dotted field name properly.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/a28da500136d6a61b04e673ae8b0a40ce80b4d1a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/a28da500136d6a61b04e673ae8b0a40ce80b4d1a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5724908" author="rstam" created="Fri, 22 Sep 2023 16:58:38 +0000"  >&lt;p&gt;I am able to reproduce this. Thanks for reporting it. I&apos;m working on a fix.&lt;/p&gt;</comment>
                            <comment id="5724427" author="dbeng-pm-bot" created="Fri, 22 Sep 2023 15:27:53 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=henning.brands%40festo.com&quot; class=&quot;user-hover&quot; rel=&quot;henning.brands@festo.com&quot;&gt;henning.brands@festo.com&lt;/a&gt;, thank you for reporting this issue! The team will look into it and get back to you soon. &lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="2458487">CSHARP-4806</issuekey>
        </issuelink>
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