Missing constructor exception when using subclass automapping

[kYann]

Hello,

When using subclass automapping, and setting the discriminated value, if the discriminated value is not a string the AutoSubClassPart object can't be created.

System.MissingMethodException : Constructor on type
'FluentNHibernate.Automapping.AutoSubClassPart`1
[[Something.Model.Sender, Something.Core, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=null]]' not found.

This is due to the fact that the AutoSubClassPart constructor takes a string as a discriminated value, if we give anything different than a string Activator.CreateInstance can't find the constructor.

fluent-nhibernate/src/FluentNHibernate/Automapping/AutoMapping.cs

Lines 162 to 175 in 161ffa1

	public AutoSubClassPart<TSubclass> SubClass<TSubclass>(object discriminatorValue, Action<AutoSubClassPart<TSubclass>> action)
	where TSubclass : T
	{
	var genericType = typeof(AutoSubClassPart<>).MakeGenericType(typeof(TSubclass));
	var subclass = (AutoSubClassPart<TSubclass>)Activator.CreateInstance(genericType, null, discriminatorValue);
	if (action != null)
	action(subclass);
	// remove any mappings for the same type, then re-add
	providers.Subclasses[typeof(TSubclass)] = subclass;
	return subclass;
	}

public void Override(AutoMapping<Sender> mapping)
{
	mapping.DiscriminateSubClassesOnColumn("__type");
	mapping.SubClass<SpecialSender>(0);
}

[hazzik]

Inline Subclass definitions never worked with the AutoMapping<>, see #51

With #469 you can now set DiscriminatorValue on subclass:

public void Override(AutoMapping<SpecialSender> mapping)
{
	mapping.DiscriminatorValue(0);
}