Question

How can I specify a realtionship on the same table using Entity Framework?

My table ‘Items’ has the following fields:
– Id (uniqueidentifier)
– ThreadId (uniqueidentifier)
– Created (datetime)
– Text (nvarchar(max))

My model ‘Item’:
– Id (Guid)
– ThreadId (Guid)
– Created (DateTime)
– Text (string)
– ChildItems (Icollection)

How can I create the relationship so that ChildItems holds the items with Id = ThreadId?

Answer 1

I think the following shall do it:

modelBuilder.Entity<Item>()
                    .HasOptional(c => c.ChildItems)
                    .WithMany()
                    .HasForeignKey(c => c.ThreadId);