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POFluent NHibernate table per hierarchy mapping problem
 

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    <p>I'm using Fluent NHibernate version 1.0.0.579 (latest version at this date). I have an abstract Activity class and several inheriting classes, eg. DummyActivity. All of them use the same table Activities, and all of them have a discriminator value based on an integral type which points to a mapping in the project (not a FK in database).</p> <p>We built the mapping like this:</p> <pre><code>public class ActivityMap : ClassMap&lt;Activity&gt; { public ActivityMap() { Table("Activities"); Id(x =&gt; x.Id).Column("ID").GeneratedBy.Guid(); Map(x =&gt; x.ActivityName).Not.Nullable().Length(50); HasMany(x =&gt; x.ActivityParameters) .KeyColumn("ActivityID") .AsMap&lt;string&gt;(idx =&gt; idx.Column("ParameterName"), elem =&gt; elem.Column("ParameterValue")) .Not.LazyLoad() .Cascade.Delete() .Table("ActivityParameters"); DiscriminateSubClassesOnColumn&lt;int&gt;("ActivityType") .SubClass&lt;DummyActivity&gt;(1, c =&gt; { }); } } </code></pre> <p>The generated hbm.xml file is:</p> <pre><code>&lt;hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-access="property" auto-import="true" default-cascade="none" default-lazy="true"&gt; &lt;class xmlns="urn:nhibernate-mapping-2.2" name="***.Activity, ***, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="Activities"&gt; &lt;id name="Id" type="System.Guid, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt; &lt;column name="ID" /&gt; &lt;generator class="guid" /&gt; &lt;/id&gt; &lt;discriminator column="ActivityType" type="Int32" insert="true" not-null="true" /&gt; &lt;property name="ActivityName" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt; &lt;column name="ActivityName" length="50" not-null="true" /&gt; &lt;/property&gt; &lt;map cascade="delete" lazy="false" name="ActivityParameters" table="ActivityParameters"&gt; &lt;key&gt; &lt;column name="ActivityID" /&gt; &lt;/key&gt; &lt;index type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt; &lt;column name="ParameterName" /&gt; &lt;/index&gt; &lt;element type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt; &lt;column name="ParameterValue" /&gt; &lt;/element&gt; &lt;/map&gt; &lt;subclass name="***.DummyActivity, ***, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" discriminator-value="1" /&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p>According to my belief, this looks like a valid hbm.xml file, identical in structure with the example given in the official NHibernate reference document, that is </p> <pre><code>&lt;class name="IPayment" table="PAYMENT"&gt; &lt;id name="Id" type="Int64" column="PAYMENT_ID"&gt; &lt;generator class="native"/&gt; &lt;/id&gt; &lt;discriminator column="PAYMENT_TYPE" type="String"/&gt; &lt;property name="Amount" column="AMOUNT"/&gt; ... &lt;subclass name="CreditCardPayment" discriminator-value="CREDIT"&gt; ... &lt;/subclass&gt; &lt;subclass name="CashPayment" discriminator-value="CASH"&gt; ... &lt;/subclass&gt; &lt;subclass name="ChequePayment" discriminator-value="CHEQUE"&gt; ... &lt;/subclass&gt; &lt;/class&gt; </code></pre> <p>Are we making some mistake in our mapping? Also, can somebody point me the new implementation recommended by Fluent (using SubClass with discriminator column, something like</p> <pre><code>public class ActivityMap : ClassMap&lt;Activity&gt; { public ActivityMap() { Table("Activities"); Id(x =&gt; x.Id).Column("ID").GeneratedBy.Guid(); Map(x =&gt; x.ActivityName).Not.Nullable().Length(50); HasMany(x =&gt; x.ActivityParameters) .KeyColumn("ActivityID") .AsMap&lt;string&gt;(idx =&gt; idx.Column("ParameterName"), elem =&gt; elem.Column("ParameterValue")) .Not.LazyLoad() .Cascade.Delete() .Table("ActivityParameters"); DiscriminateSubClassesOnColumn&lt;int&gt;("ActivityType"); } } public class DummyActivityMap : SubClass&lt;DummyActivity&gt; { ///discriminator value here how??? } </code></pre> <p>?)</p> <p>The stack trace is </p> <pre><code>[FormatException: Input string was not in a correct format.] System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer&amp; number, NumberFormatInfo info, Boolean parseDecimal) +7469351 System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +119 NHibernate.Type.Int32Type.FromStringValue(String xml) +36 NHibernate.Type.Int32Type.StringToObject(String xml) +10 NHibernate.Persister.Entity.SingleTableEntityPersister..ctor(PersistentClass persistentClass, ICacheConcurrencyStrategy cache, ISessionFactoryImplementor factory, IMapping mapping) +7824 [MappingException: Could not format discriminator value to SQL string of entity ***.Activity] NHibernate.Persister.Entity.SingleTableEntityPersister..ctor(PersistentClass persistentClass, ICacheConcurrencyStrategy cache, ISessionFactoryImplementor factory, IMapping mapping) +8183 NHibernate.Persister.PersisterFactory.CreateClassPersister(PersistentClass model, ICacheConcurrencyStrategy cache, ISessionFactoryImplementor factory, IMapping cfg) +68 NHibernate.Impl.SessionFactoryImpl..ctor(Configuration cfg, IMapping mapping, Settings settings, EventListeners listeners) +1468 NHibernate.Cfg.Configuration.BuildSessionFactory() +87 FluentNHibernate.Cfg.FluentConfiguration.BuildSessionFactory() in d:\Builds\FluentNH\src\FluentNHibernate\Cfg\FluentConfiguration.cs:93 [FluentConfigurationException: An invalid or incomplete configuration was used while creating a SessionFactory. Check PotentialReasons collection, and InnerException for more detail. ] ***.Container.ConfigureNHibernate() in ***.Unity\Container.cs:92 ***.Container.ConfigureContainer() in ***.Unity\Container.cs:60 ***.Container.GetInstance() in ***.Unity\Container.cs:45 ***.Global.CreateContainer() in ***\Global.asax.cs:72 ***.Global.Application_Start(Object sender, EventArgs e) in ***\Global.asax.cs:44 </code></pre>
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