What is the correct one to zero or one mapping in Entity Framework?

Question

I have this model:

public class Address
{
    public int Id {get; set;}
    public string Street {get; set;}
    public string HouseNo{get; set;}
}

public class Customer
{
    public int Id {get; set;}
    public string Name {get; set;}
    public int AddressId {get; set;}
    public virtual void Address Address {get; set;}
}

The current mapping for the Customer map is:

this.Property(t => t.AddressId).HasColumnName("address_id");

this.HasOptional(t => t.Address)
    .WithMany()
    .HasForeignKey(d => d.AddressId);

There is no mapping back to the Customer in the Address map.

But this is not working because if I remove the address from the customer, the address record is not deleted from the db.

What is the correct way to add a 1..0-1 relationship where the 0-1 side is owned by the 1 side?

Answer 1

Try this one

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
   modelBuilder.Entity<Customer>()
               .HasOptional(customer => customer.Address)
               .WithRequired()
               .Map(mapping => mapping.MapKey("custom_fk_customer_id"));

   base.OnModelCreating(modelBuilder);
}