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    copied!<p>Your classes would look like the following</p> <pre><code>public class User { public virtual int UserId { get; set; } public virtual string UserName { get; set; } public virtual IList&lt;UserRating&gt; Ratings { get; set; } } public class Item { public virtual int ItemId { get; set; } public virtual string ItemName { get; set; } public virtual IList&lt;UserRating&gt; Ratings { get; set; } } public class UserRating { public virtual User User { get; set; } public virtual Item Item { get; set; } public virtual Int32 Rating { get; set; } } </code></pre> <p>Your mapping file would look like </p> <pre><code>&lt;hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Test" namespace="Test" &gt; &lt;class name="User"&gt; &lt;id name="UserId" &gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;property name="UserName" /&gt; &lt;bag name="Ratings" generic="true" inverse="true" table="UserRating"&gt; &lt;key column="UserId" /&gt; &lt;one-to-many class="UserRating"/&gt; &lt;/bag&gt; &lt;/class&gt; &lt;class name="Item" &gt; &lt;id name="ItemId" &gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;property name="ItemName" /&gt; &lt;bag name="Ratings" generic="true" inverse="true" table="UserRating"&gt; &lt;key column="ItemId" /&gt; &lt;one-to-many class="UserRating"/&gt; &lt;/bag&gt; &lt;/class&gt; &lt;class name="UserRating" &gt; &lt;composite-id&gt; &lt;key-many-to-one class="User" column="UserId" name="User" /&gt; &lt;key-many-to-one class="Item" column="ItemId" name="Item" /&gt; &lt;/composite-id&gt; &lt;property name="Rating" /&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p>I would suggest you look at the <a href="http://www.summerofnhibernate.com" rel="nofollow noreferrer">Summer of Nhibernate</a> screen cast as well as the <a href="http://www.autumnofagile.net/" rel="nofollow noreferrer">Autumn of Agile</a> series by Stephen Bohlen which gave me a great start with nhibernate.</p>
 

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