问题
Is it possible to save model which has got circular dependency ?
I denormalized my Database:
User -------- UserId UserName LastOrder - fk to last order Order ------- OrderId OrderName UserId OrderDate
Is it possible to save sth like this using entityFramework?
what should I change to make it work cause now I have got error:
Unable to determine a valid ordering for dependent operations. Dependencies may exist due to foreign key constraints, model requirements, or store-generated values.
回答1:
I had a table that had a relationship to itself and i was getting the same error. Turns out the foreign key has to be nullable. Same table relationship in Entity Framework I hope this saves someone more time than I wasted.
来源：https://stackoverflow.com/questions/4304298/circular-dependency-in-entity-framework