一对一关系模型

Question

I'm trying to set a one-to-one relationship. Where do I write these lines, please?

modelBuilder.Entity<OfficeAssignment>() 
    .HasRequired(t => t.Instructor) 
    .WithOptional(t => t.OfficeAssignment);

Thanks a lot!

Answer 1

You will write those lines of code in your context class, in the OnModelCreating method

    public class MyContext : DbContext
    {

        public DbSet<OfficeAssignment> OfficeAssignments { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<OfficeAssignment>() 
                        .HasRequired(t => t.Instructor) 
                        .WithOptional(t => t.OfficeAssignment);

            base.OnModelCreating(modelBuilder);
        }
    }

Answer 2

You can write this in the context class eg:

   public class AssignmentContext : DbContext
   {
      public IDbSet<OfficeAssignment> OfficeAssignments { get; set; }
      protected override void OnModelCreating(DbModelBuilder modelBuilder)
      {
          modelBuilder.Entity<OfficeAssignment>() 
             .HasRequired(t => t.Instructor) 
             .WithOptional(t => t.OfficeAssignment);
          base.OnModelCreating(modelBuilder);
      }
   }