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PONullReferenceException mapping collection of enum with Fluent NHibernate automapping
 

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    <p>I have a class that contains a collection of enumeration as follows.</p> <pre><code>public enum TransactionType { ... } public class PaymentMethod { ... public virtual IList&lt;TransactionType&gt; SupportedTransactionTypes { get; set; } } </code></pre> <p>Other references to the TransactionType enumeration are working correctly but with this collection I get an exception: "NHibernate.MappingException : Association references unmapped class: mynamespace.TransactionType".</p> <p>Looking around it seems like I needed to specify the type of element mapping, i.e. one-to-many, element, or composite-element.</p> <p>I have setup the following override mappings for the PaymentMethod class:</p> <pre><code>mapping.HasMany(x =&gt; x.TransactionTypes) .Element("TransactionTypeId"), x =&gt; x.Type&lt;TransactionType&gt;()); </code></pre> <p>But this causes the following exception...</p> <p>Validation failed: System.NullReferenceException: Object reference not set to an instance of an object. at FluentNHibernate.Conventions.Inspections.OneToManyInspector.get_Class() in e:\horn.horn\orm\fluentnhibernate\Working\src\FluentNHibernate\Conventions\Inspections\OneToManyInspector.cs:line 40 at FluentNHibernate.Conventions.ProxyConvention.Apply(ICollectionInstance instance) in e:\horn.horn\orm\fluentnhibernate\Working\src\FluentNHibernate\Conventions\ProxyConvention.cs:line 79 at FluentNHibernate.Visitors.ConventionVisitor.Apply[TInspector,TInstance](IEnumerable conventions, TInstance instance) in e:\horn.horn\orm\fluentnhibernate\Working\src\FluentNHibernate\Visitors\ConventionVisitor.cs:line 269 at ...</p> <p>I have tried a lot of different variations on the mapping, including TableName, KeyColumn and anything else I can think of but I can't get this mapping to work.</p> <p>Any help appreciated...</p>
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