Entity Framework table with multiple optional one to one relationships

Question

There are a few questions out there but none of them have been much help to me so I decided to ask my own.

I want to use Entity Framework code first to create a st

Answer 1

In your mappings you set Document as principal, but in reality it is the dependent. So you should change your mappings to:

modelBuilder.Entity<Document>()
    .HasRequired(d => d.Qualification)
    .WithOptionalDependent(q => q.Document);

modelBuilder.Entity<Document>()
    .HasRequired(d => d.Asssessment)
    .WithOptionalDependent(q => q.Document);