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    <p>Interestingly, I'm getting almost the exact opposite of this behavior in 2.1.2.</p> <h3>My mapping (simplified):</h3> <pre><code>&lt;!-- Subscriber class --&gt; &lt;class name="Subscriber" &gt; &lt;composite-id name="SubscriberKey" class="SubscriberKey"&gt; &lt;key-property name="Request" column="RequestID" type="int"/&gt; &lt;key-many-to-one name="User" column="UserID" class="User" not-found="ignore" /&gt; &lt;/composite-id&gt; &lt;!-- User class - note that this goes to a different schema, and is not mutable. Who knows if that's important... --&gt; &lt;class name="User" schema="AnotherDb.dbo" mutable="false"&gt; &lt;id name="Id" column="UserID" type="int"&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;property name="FirstName" column="FirstName" type="string" /&gt; &lt;property name="LastName" column="LastName" type="string" /&gt; </code></pre> <h3>goes to:</h3> <pre><code>public class User { public virtual int? Id {get; protected set;} public virtual string FirstName { get; protected set; } public virtual string LastName { get; protected set; } public User() { } } public class Subscriber { public virtual SubscriberKey SubscriberKey { get; set; } public virtual User User { get; set; } public Subscriber() { } } public class SubscriberKey { public override bool Equals(object obj) { if (obj is SubscriberKey &amp;&amp; obj != null) return ((SubscriberKey)obj).Request == Request &amp;&amp; ((SubscriberKey)obj).User.Id == User.Id; return false; } public override int GetHashCode() { return (Request.ToString() + User.Id.ToString()).GetHashCode(); } public virtual int Request { get; set; } public virtual User User { get; set; } public SubscriberKey() { } } </code></pre> <h3>Things which work:</h3> <pre><code>CreateCriteria&lt;Subscriber&gt;() .Add(Restrictions.IdEq(keyInstance)) .UniqueResult&lt;Subscriber&gt;(); CreateCriteria&lt;Subscriber&gt;() .Add(Restrictions.Eq("SubscriberKey.User.Id", aUserID)) .Add(Restrictions.Eq("SubscriberKey.Request", aRequestID)) .UniqueResult&lt;Subscriber&gt;(); </code></pre> <h3>Things which don't work:</h3> <pre><code>Get&lt;Subscriber&gt;(keyInstance); </code></pre> <p>I'm thinking this is an inconsistency between their various ID-equaling query forms. When I get time, I'll be building a minimal unit test to submit as a bug example. I'd be interested in any / all thoughts anyone might have on this...</p> <hr> <p>edit: Heeey, I figured it out!</p> <h2>Things which do work, now that I've read <a href="http://ayende.com/Blog/archive/2009/04/30/nhibernate-ndash-the-difference-between-get-load-and-querying-by.aspx" rel="nofollow">this</a></h2> <pre><code>Get&lt;Subscriber&gt;(new SubscriberKey() { User = Load&lt;User&gt;(aUserID), // the important part! Request = aRequestID }); </code></pre> <p>This will create a proxy object for the User key, without hitting the database (unless necessary). If you swap <code>Load&lt;User&gt;</code> for <code>Get&lt;User&gt;</code>, you'll immediately hit the database to populate the object, rather than respecting your lazy-loading properties. Use Load.</p> <p>And things like this are precisely why people suggest the (type)Repository pattern - I can do this behind the scenes: <code>Get&lt;&gt;(new SK(){User=Load&lt;&gt;(key.User.Id)}</code>, and still <code>Get(key)</code> by a single key, identical to every other object.</p>
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    1. POComposite Id's and Restrictions.IdEq or with comparison in Linq not working as expected
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    1. USGroxx
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    1. COFirst of all, thanks for your notification!
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    2. COSecond, what I don't get is that your criteria api query with Restriction.IdEq(..) works! Can you please specify how you implemented the Equals/GetHashCode methods on both Subscriber and SubscriberKey? Maybe something has changed between the beta's and the GA version. Will test this soon to verify.
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    3. COThird, I am aware of the Load/Get behavior and do not use the criteria api to retrieve an object by its primary key. I simplified the scenerio until all that remained was this but the actual queries result in several inner joins.
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