Haven’t been able to look at this. Will see if I get some time over this weekend.

//Daniel

Very nice article.
I’m fiddling around too and one thing i can’t get to work is when i define a navigation property in the abstract class.

I want all my derived classes to have a certain assocation with another class.

So in fact i want to inherit an assocation/relationship.

I get the same error as Arne (previous reply).

here’s my problem explained: http://stackoverflow.com/questions/2270789/ef-4-0-code-only-assocation-from-abstract-to-derived

I bumbed into this error but that was when I only mapped the property as an identity and didn’t specify HasKey for the property.

I repeat this mapping in every EntityConfiguration (one for each entity being stored).

//Daniel

Thank you for this info. But I’ve ran into a problem where you apparently haven’t.

I also have an abstract class with a property ID.
However, my classes that inherit this abstract class can’t use HasKey(u => u.ID);

I get the following error “A key registered for the derived type ‘…User’. Keys must be registered for the root type ‘…Entity’”

Have you encountered this and found a way around it?

Thanks in advance,
Arne