Is it possible to have a hook function (e.g.

operationBefore

) fire in response to a change in a relationship? For example, I have

Department

and

Employee

types, and a relationship between the two to define managers. I want a hook to fire in response to the

addToDepartmentManagers

mutation. I've tried hooking into both

Department.update

and

Employee.update

operations but neither get triggered.