How to expose Foreign Key property to existing entity having navigational property using EF6 Code First

Question

I have an entity which is already being used with an underlying database, and it was created with just the navigational property to an optional entity (1:0..1). So by default c

Answer 1

Try adding foreign key attribute.

public long? MyOptionalEntityB_Id { get; set; }
[ForeignKey("MyOptionalEntityB_Id")]
public MyEntityB MyOptionalEntityB { get; set; }

Or using fluent api.

 modelBuilder.Entity<MyEntityA >()
    .HasOptional(x => x.MyOptionalEntityB)
    .WithMany().HasForeignKey(x => x.MyOptionalEntityB_Id);
          // ^^^ -> if MyEntityB has collection of MyEntityA, mention it