Can I mix Table per Hierarchy and Table per Type in Entity Framework?

Question

Say I have 2 tables: Message and SuperMessage

and 3 entities: Message (base (not abstract)), Comment (inherits from Message) and SuperMessage (inherits from Message)

Answer 1

I reproduced this and got the same error as you. As far as I can tell, it appears that combining these two types of inheritance for a single base table is just not possible. I'd love to be proved wrong though. ;-)

Answer 2

Have you tried adding an intermediate abstract entity type, i.e.:

abstract     MessageBase      --> Message table
non-abstract Message          --> Message table when MessageType == 1
non-abstract Comment          --> Message table when MessageType == 2
abstract     SuperMessageBase --> Message table when MessageType == 3
non-abstract SuperMessage     --> SuperMessage table

Also check out a similar scenario I solved: EF: Can I mix TPH and TPT when abstract base and a few concrete types are in TPH-table and other types have their own table?