Thread: [nhibernate-issues] [NHJIRA] Created: (NH-2553) Nhibernate fails to delete entity.

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Nhibernate fails to delete entity.
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                 Key: NH-2553
                 URL: http://216.121.112.228/browse/NH-2553
             Project:  NHibernate
          Issue Type: Bug
          Components: Core
    Affects Versions: 3.0.0.GA
            Reporter: Søren Munk
            Priority: Critical

We get this error while committing the nh transaction. (If we dont use the transaction, we still get the error)
System.IndexOutOfRangeException: Parameter index is out of range.
   at MySql.Data.MySqlClient.MySqlParameterCollection.CheckIndex(Int32 index)
   at MySql.Data.MySqlClient.MySqlParameterCollection.GetParameter(Int32 index)
   at System.Data.Common.DbParameterCollection.System.Collections.IList.get_Item(Int32 index)
   at NHibernate.Type.Int32Type.Set(IDbCommand rs, Object value, Int32 index)
   at NHibernate.Type.NullableType.NullSafeSet(IDbCommand cmd, Object value, Int32 index)
   at NHibernate.Type.NullableType.NullSafeSet(IDbCommand st, Object value, Int32 index, ISessionImplementor session)
   at NHibernate.Persister.Entity.AbstractEntityPersister.Dehydrate(Object id, Object[] fields, Object rowId, Boolean[] includeProperty, Boolean[][] includeColumns, Int32 table, IDbCommand statement, ISessionImplementor session, Int32 index)
   at NHibernate.Persister.Entity.AbstractEntityPersister.Update(Object id, Object[] fields, Object[] oldFields, Object rowId, Boolean[] includeProperty, Int32 j, Object oldVersion, Object obj, SqlCommandInfo sql, ISessionImplementor session)
   at NHibernate.Persister.Entity.AbstractEntityPersister.UpdateOrInsert(Object id, Object[] fields, Object[] oldFields, Object rowId, Boolean[] includeProperty, Int32 j, Object oldVersion, Object obj, SqlCommandInfo sql, ISessionImplementor session)
   at NHibernate.Persister.Entity.AbstractEntityPersister.Update(Object id, Object[] fields, Int32[] dirtyFields, Boolean hasDirtyCollection, Object[] oldFields, Object oldVersion, Object obj, Object rowId, ISessionImplementor session)
   at NHibernate.Action.EntityUpdateAction.Execute()
   at NHibernate.Engine.ActionQueue.Execute(IExecutable executable)
   at NHibernate.Engine.ActionQueue.ExecuteActions(IList list)
   at NHibernate.Engine.ActionQueue.ExecuteActions()
   at NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutions(IEventSource session)
   at NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent event)
   at NHibernate.Impl.SessionImpl.Flush()
...

Our mapping is like this:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Model" namespace="Model">
  <class name="ServerBillingMapping" table="rel_server_billing" lazy="true">
    <id name="Id" column="rel_server_billing_id">
      <generator class="native" />
    </id>

    <many-to-one name="Server" column="server_id" lazy="proxy" cascade="none" />
    <many-to-one name="ServerType" column="servertype_id" lazy="proxy" cascade="none" />
    <many-to-one name="Billing" column="billing_id" lazy="proxy" cascade="none" />
  </class>
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Model" namespace="Model">

  <class name="Billing" table="billing" lazy="false">
    <cache usage="read-write"/>

    <id name="Id" column="billing_id">
      <generator class="native" />
    </id>

    <set name="ServerMappings" lazy="true" table="rel_server_billing" cascade="all-delete-orphan">
      <key column="billing_id" />
      <one-to-many class="ServerBillingMapping" not-found="ignore" />
    </set>
  </class>
</hibernate-mapping>

Code:

var billing = repo.FindBilling(Id);
var mapping = billing.ServerMappings.Where(bla bla).FirstOrDefault();
repo.Delete(mapping);
billing.ServerMappings.Remove(mapping);
repo.Save(billing);
repo.CommitTransaction(); <-- calls flush, and fails.

We also get an error "Method not supported". If ServerBillingMapping has mappings with lazy="no-proxy". And accessing the object through the reverse mapping. Eg. Billing.ServerMappings.FirstOrDefault();

Method not supported.
   at NHibernate.Proxy.AbstractProxyFactory.GetFieldInterceptionProxy() in d:\CSharp\NH\nhibernate\src\NHibernate\Proxy\AbstractProxyFactory.cs:line 49

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