How does Entity Framework work with recursive hierarchies? Include() seems not to work with it

Question

I have an Item. Item has a Category.

Category has ID, Name, Parent

Answer 1

You chould rather introduce a mapping table that maps each Category a parent and a child, instead of adding the parent and child property to the cargo itself.

Depending on how often you need that information it can be queried on demand. Via unique constraints in the db you can avoid an infinite amount of relationships beeing possible.