Include child relation

Question

I got the following document:

TodoList
    Id
    TodoItems
        Title
        UserId

How can I Include<UserDocument>() for each todo item using Load<> or Query<>?

Edit: I want to fetch a todolist and all related users in the same get without using projection

Answer 1

session.Include("ToDoItems.UserId").Load<ToDoList>("todolists/1");