Entity Framework CTP 5 One to One mapping?

What you are after is called One-to-One Foreign Key Associations and like Ladislav mentioned is not natively supported by EF. However, I showed how to implement it with Code First in this article .

Unfortunatelly current version of EF is not able to work with unique constraint. The only way how to achieve 1:0..1 mapping in EF is "sharing PK". It means that if main entity is Fixture it will have FixtureId as its PK and Requirement will have FixtureId as its PK and FK to Fixture.

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