one-to-many relation using two columns in Entity Framework Core

Question

In my project I have a table Translation that can have translations for any model. To achieve this, the table has two fields: Model and ModelId

Answer 1

Yes, there is. Use this:

modelBuilder.Entity()
.HasMany(bm => bm.Translations)
.WithForeignKey(x => new { x.Key1, x.Key2 });

Key1 and Key2 obviously need to be the keys to the relation and you may also need to define them as such (in the same order) for the Translation entity.