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copied!<p>There are two possible issues in your code.</p> <ol> <li><strong>Imagem.Bytes</strong> property is lazy-loaded but lazy loading for <strong>Imagem</strong> istself is disabled. It means no proxy is generated for <strong>Imagem</strong> instances and <strong>Bytes</strong> cannot be lazy-loaded: mission impossible (at least it appears to me right now, not sure). Simple load from database (<code>session.Get<Imagem>(id);</code>) leads to exceptions like this: <code>Invalid Cast (check your mapping for property type mismatches); setter of Imagem</code>. Solution is to enable lazy-loading on Imagem or disable lazy loading on <strong>Bytes</strong> property.</li> <li>PersistenceSpecification loads tested entity from database <a href="https://github.com/jagregory/fluent-nhibernate/blob/master/src/FluentNHibernate/Testing/PersistenceSpecification.cs#L56" rel="nofollow">as another instance</a>. It means that default equality comparer does not work well. You need to provide your own equality comparer to solve this issue (check this for more details).</li> </ol> <p>Here is <a href="http://pastie.org/2640070" rel="nofollow">Receita</a> and <a href="http://pastie.org/2640077" rel="nofollow">Imagem</a> entities, implementation of <a href="http://pastie.org/2640080" rel="nofollow">IEqualityComparer</a> and <a href="http://pastie.org/2640085" rel="nofollow">PersistentSpecification</a> snippet. This code works well in NH3.1 and FNH 1.2. Please, let me know if your code differs somehow from these snippets.</p>

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