Entity Framework 4: inheritance and Associations

问题:

I do derive my entities from a base-class that provides tracking.

Since User derives from TrackableBase and TrackableBase is associated with User, I get an error:

"Unable to determine a valid ordering for dependent operations. Dependencies may exist due to foreign key constraints, model requirements or store generated values."

Is this model just not possible, or am I doing something wrong?

回答1:

Is CreatedByUser a nullable foriegn key? If not, you'll get a circular reference.

related: circular dependency in entity framework

/mikkel

文章来源: Entity Framework 4: inheritance and Associations