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POHow to do NHibernate queries with reference's id as criterion?
 

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  1. POHow to do NHibernate queries with reference's id as criterion?
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    <p>I'm trying to do a query through NHibernate where the criterion for the result depends on a referenced table's ID. How do I do this? Let's look at a simple example:</p> <pre><code>public class Foo { public int Id { get; set; } public string Name { get; set; } public Bar ReferencedBar { get; set; } } public class Bar { public int Id { get; set; } public string Name { get; set; } } </code></pre> <p>Foo is then mapped to Bar:</p> <pre><code>public class FooMapping : ClassMap&lt;Foo&gt; { public FooMapping() { Id(c =&gt; c.Id).GeneratedBy.HiLo("1"); Map(c =&gt; c.Name).Not.Nullable().Length(100); References(c =&gt; c.Bar); } } </code></pre> <p>Now I want to get all Foo's from the Database which reference a specific Bar by id. This function is using Criteria, but please give examples using something else if you feel it's better:</p> <pre><code>public IList&lt;Foo&gt; GetAllFoosReferencingBar(int barId) { using (var tx = Session.BeginTransaction()) { var result = Session.CreateCriteria(typeof(Foo)) .Add(Restrictions./* foo.ReferencedBar == id */) // &lt;-- How to add restriction using id? .List&lt;Foo&gt;(); tx.Commit(); return result; } } </code></pre> <p>When I try to do this with, I get the exception:</p> <pre><code>.Add( Restrictions.Eq( "ReferencedBar", 32 ) ); </code></pre> <p>Type mismatch in NHibernate.Criterion.SimpleExpression: ReferencedBar expected type Bar, actual type System.Int32</p> <p>I do not have a reference object to Bar with id 32 yet and do not want to create one...</p>
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    1. USAlexander Yoshi
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