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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>
    </build-info>


<item>
            <title>[CSHARP-2711] only fields are allowed in a $sort when ordering by a nullable field</title>
                <link>https://jira.mongodb.org/browse/CSHARP-2711</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;I am using OData against the MongoDB IQueryable collection and it works fine but when I try to sort by a nullable field it breaks with:&#160;&lt;tt&gt;only fields are allowed in a $sort when ordering by a nullable field&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;If I convert that field to not nullable it works fine.&lt;/p&gt;

&lt;p&gt;&#160;&lt;br/&gt;
api/TimeTracking/ItemType?$orderBy=ModifiedAt =&amp;gt; error when nullable&lt;br/&gt;
api/TimeTracking/ItemType?$orderBy=ModifiedAt =&amp;gt; working when not nullable&lt;/p&gt;

&lt;p&gt;IMongoQueryable&amp;lt;T&amp;gt; query = queryOptions == null? entities.AsQueryable() : queryOptions.ApplyTo(entities.AsQueryable()) as IMongoQueryable&amp;lt;T&amp;gt;;&lt;br/&gt;
&#160;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Error:&lt;/b&gt;&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;Exceptions.ErrorHandlingMiddleware:Error: Only fields are allowed in a $sort.&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;&amp;nbsp;&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;System.NotSupportedException: Only fields are allowed in a $sort.&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;   at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateOrderBy(OrderByExpression node)&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;   at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslatePipeline(PipelineExpression node)&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;   at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node, IBsonSerializerRegistry serializerRegistry, ExpressionTranslationOptions translationOptions)&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;   at MongoDB.Driver.Linq.MongoQueryProviderImpl`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;.ExecuteAsync[TResult](Expression expression, CancellationToken cancellationToken)&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;   at MongoDB.Driver.Linq.MongoQueryableImpl`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2&lt;/span&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;.ToCursorAsync(CancellationToken cancellationToken)&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;   at MongoDB.Driver.IAsyncCursorSourceExtensions.ToListAsync[TDocument](IAsyncCursorSource`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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; source, CancellationToken cancellationToken)&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;{{}}&lt;/p&gt;

&lt;p&gt;Did anyone have a similar experience? Is there a workaround for this?&lt;/p&gt;

&lt;p&gt;{{}}&lt;/p&gt;

&lt;p&gt;Nuget:&lt;/p&gt;

&lt;p&gt;{{}}&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Microsoft.AspNetCore.OData v:7.1.0&lt;/li&gt;
	&lt;li&gt;MongoDB.Driver v:2.9.1&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;{{}}&lt;/p&gt;</description>
                <environment>Azure cloud (Windows)</environment>
        <key id="905777">CSHARP-2711</key>
            <summary>only fields are allowed in a $sort when ordering by a nullable field</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="5">Cannot Reproduce</resolution>
                                        <assignee username="dmitry.lukyanov@mongodb.com">Dmitry Lukyanov</assignee>
                                    <reporter username="zolgera81@gmail.com">Andrej Zolger</reporter>
                        <labels>
                    </labels>
                <created>Sun, 25 Aug 2019 05:48:33 +0000</created>
                <updated>Fri, 12 Nov 2021 16:45:45 +0000</updated>
                            <resolved>Wed, 25 Sep 2019 12:06:28 +0000</resolved>
                                    <version>2.9.1</version>
                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2432593" author="dmitry.lukyanov" created="Wed, 25 Sep 2019 12:06:28 +0000"  >&lt;p&gt;Feel free to reopen this ticket if it&apos;s still relevant for you&lt;/p&gt;</comment>
                            <comment id="2424739" author="dmitry.lukyanov" created="Wed, 18 Sep 2019 22:18:11 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=zolgera81%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;zolgera81@gmail.com&quot;&gt;zolgera81@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I&apos;ve tried to reproduce your situation, but without any results.&lt;br/&gt;
Can you please provide the following information (as many as you can):&lt;br/&gt;
1. The generated linq query which triggers this error: `Only fields are allowed in a $sort` (without `OData` specific things).&lt;br/&gt;
2. The structure of classes which are mentioned in the url: `api/TimeTracking/ItemType?$orderBy=ModifiedAt`. Ideally, it will be great, if you can provide a small console application which reproduces this problem.&lt;br/&gt;
3. it will not be superfluous if you can provide 1-2 db records which you expect to see in the result of api/TimeTracking/ItemType?$orderBy=ModifiedAt&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="1922966">CSHARP-3965</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
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