Unable to specify abstract classes in TPH hierarchy in Entity Framework 4

Posted by Lee Atkinson on Stack Overflow See other posts from Stack Overflow or by Lee Atkinson
Published on 2010-05-28T10:30:35Z Indexed on 2010/05/28 15:22 UTC
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entity-framework

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entity-framework-4

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edmx

Hi

I have a TPH heirachy along the lines of:

A->B->C->D

A->B->C->E

A->F->G->H

A->F->G->I

I have A as Abstract, and all the other classes are concrete with a single discriminator column.

This works fine, but I want C and G to be abstract also. If I do that, and remove their discriminators from the mapping, I get error 3034 'Two entities with different keys are mapped to the same row'. I cannot see how this statement can be correct, so I assume it's a bug in some way.

Is it possible to do the above?

Lee

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