bugfix assign_userrole

backend/app/db/cruddb/dbuser.py

@@ -74,10 +74,11 @@ class dbuser(crudbase):
         db_user = super().get(db,user_id)
         if db_user:
             for role in db_user.roles:
-                db_user.roles.remove(role)
+                if role.id not in roles:
+                    db_user.roles.remove(role)
             for roleid in roles:
                 role = dbrole.get(db,roleid)
-                if role:
+                if role not in db_user.roles:
                     db_user.roles.append(role)
         db.commit()
         db.refresh(db_user)