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PONHibernate query against the key field of a dictionary (map)
 

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    <p>I have an object model where a Calendar object has an <code>IDictionary&lt;MembershipUser, Perms&gt;</code> called UserPermissions, where MembershipUser is an object, and Perms is a simple enumeration. This is in the mapping file for Calendar as</p> <pre><code>&lt;map name="UserPermissions" table="CalendarUserPermissions" lazy="true" cascade="all"&gt; &lt;key column="CalendarID"/&gt; &lt;index-many-to-many class="MembershipUser" column="UserGUID" /&gt; &lt;element column="Permissions" type="CalendarPermission" not-null="true" /&gt; &lt;/map&gt; </code></pre> <p>Now I want to execute a query to find all calendars for which a given user has some permission defined. The permission is irrelevant; I just want a list of the calendars where a given user is present as a key in the UserPermissions dictionary. I have the username property, not a <code>MembershipUser</code> object. How do I build that using QBC (or HQL)? Here's what I've tried:</p> <pre><code>ISession session = SessionManager.CurrentSession; ICriteria calCrit = session.CreateCriteria&lt;Calendar&gt;(); ICriteria userCrit = calCrit.CreateCriteria("UserPermissions.indices"); userCrit.Add(Expression.Eq("Username", username)); return calCrit.List&lt;Calendar&gt;(); </code></pre> <p>This constructed invalid SQL -- the WHERE clause contained <code>WHERE membership1_.Username = @p0</code> as expected, but the FROM clause didn't include the MemberhipUsers table.</p> <p>Also, I really had to struggle to learn about the <code>.indices</code> notation. I found it by digging through the NHibernate source code, and saw that there's also <code>.elements</code> and some other dotted notations. Where's a reference to the allowed syntax of an association path? I feel like what's above is very close, and just missing something simple.</p>
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