EF Core - Many to many relationship on a class

Question

User-Friend relationship

I find an answer

Entity Framework Core: many-to-many relationship with same entity and try like this.

Entitys:

Answer 1

It's not mandatory the second collection. You only need to left de .WithMany() empty like this:

modelBuilder.Entity()
    .HasOne(f => f.MainUser)
    .WithMany()
    .HasForeignKey(f => f.MainUserId);

modelBuilder.Entity()
    .HasOne(f => f.FriendUser)
    .WithMany()
    .HasForeignKey(f => f.FriendUserId);

look at this : https://github.com/aspnet/EntityFramework/issues/6052