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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>[CSHARP-140] Hide hierarchy discriminator in query when anonymous type is used for wrapping.</title>
                <link>https://jira.mongodb.org/browse/CSHARP-140</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;Here is sample code firstly:&lt;br/&gt;
----------------------------------------&lt;br/&gt;
A a = new A();&lt;br/&gt;
a.b = &quot;asd1&quot;;&lt;br/&gt;
a.c = &quot;asd2&quot;;&lt;/p&gt;

&lt;p&gt;db.GetCollection&amp;lt;A&amp;gt;(&quot;A&quot;).Insert(a);&lt;/p&gt;

&lt;p&gt;var o1 = db.GetCollection&amp;lt;A&amp;gt;(&quot;A&quot;).FindOneAs&amp;lt;A&amp;gt;(Query.Wrap(new &lt;/p&gt;
{ c = &quot;asd2&quot; }));&lt;br/&gt;
&lt;br/&gt;
object selector = new { c = &quot;asd2&quot; }
&lt;p&gt;;&lt;br/&gt;
var o2 = db.GetCollection&amp;lt;A&amp;gt;(&quot;A&quot;).FindOneAs&amp;lt;A&amp;gt;(Query.Wrap(selector));&lt;/p&gt;

&lt;p&gt;Assert.IsNotNull(o1);	// Success&lt;br/&gt;
Assert.IsNotNull(o2);	// Fail		&lt;br/&gt;
----------------------------------------&lt;/p&gt;

&lt;p&gt;The problem is when I want to use anonymous type instance as a selector for wrapping query.&lt;br/&gt;
Getting o1 I use it in a place of calling, so actualType and nominalType are equals and driver does not insert hierarhy discriminator into query.&lt;br/&gt;
sometimes I want to pass filter as argument for functions, so this case anonymous type insance casted to object, so actualType and nominalType are differ, and driver adds discriminator according to this code:&lt;/p&gt;

&lt;p&gt;BsonClassMapSerialzier.Serialize(..) line 175.&lt;br/&gt;
----------------------------------------&lt;br/&gt;
if (actualType != nominalType || classMap.DiscriminatorIsRequired || classMap.HasRootClass) {&lt;br/&gt;
    var discriminatorConvention = BsonDefaultSerializer.LookupDiscriminatorConvention(nominalType);&lt;br/&gt;
    var discriminator = discriminatorConvention.GetDiscriminator(nominalType, actualType);&lt;br/&gt;
    if (discriminator != null) &lt;/p&gt;
{
        bsonWriter.WriteName(discriminatorConvention.ElementName);
        discriminator.WriteTo(bsonWriter);
    }
&lt;p&gt;}&lt;br/&gt;
----------------------------------------&lt;/p&gt;

&lt;p&gt;I think it would be better if no descriminator applied when using anonymous instance as a subject for wrapping.&lt;/p&gt;

</description>
                <environment>MongoDB v 1.6.3&lt;br/&gt;
C# Driver version: both Bison and Driver 0.9.1  (from github)</environment>
        <key id="14050">CSHARP-140</key>
            <summary>Hide hierarchy discriminator in query when anonymous type is used for wrapping.</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="9">Done</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="bug0r">Timofei Mironov</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Dec 2010 11:22:45 +0000</created>
                <updated>Thu, 2 Apr 2015 18:27:53 +0000</updated>
                            <resolved>Mon, 27 Dec 2010 17:43:09 +0000</resolved>
                                    <version>0.9</version>
                                    <fixVersion>1.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="21814" author="rstam" created="Mon, 27 Dec 2010 17:43:09 +0000"  >&lt;p&gt;We now never serialize a discriminator for anonymous classes or wrapped objects (with the exception of Update.Replace).&lt;/p&gt;</comment>
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