In which controller is it correct to place a method that returns group users?

Question

Design patterns

There is a user entity and a UserController controller corresponding to it with get, edit, delete methods
there is a group entity and a GroupControlle controller corresponding to it with create, get, edit, delete methods
user can be in several groups, links in the user_groups table It is
necessary to place the getUsersByGroupId method processing the address / groups/:group_id/users
In which controller should this method be placed and why?

Answer 1

Obviously not in GroupControlle. In UserController because this is where the work with the users themselves comes in. Although I would generally add a separate model for this. If I understand your problem correctly.