Entity Framework Mapping relationship with Entity Framework Code First: One-to-one and variations Mapping one or zero-to-one or zero
Example
And to finish off, let's briefly look at the case when both sides are optional.
By now you should be really bored with these examples :), so I'm not going into the details and play with the idea of having two FK-s and the potential problems and warn you about the dangers of not enforcing these rules in the schema but in just EF itself.
Here's the config you need to apply:
public class CarEntityTypeConfiguration : EntityTypeConfiguration<Car>
{
public CarEntityTypeConfiguration()
{
this.HasOptional(c => c.Person).WithOptionalPrincipal(p => p.Car);
this.HasKey(c => c.PersonId);
}
}
Again, you can configure from the other side as well, just be careful to use the right methods :)
