code: def get_by_id(self, id):
          
          user = super(ExtendedUsersService, self).get_by_id(id)
          user.first_name = 'John' + str(id)
          user.last_name = 'Smith' + str(id)
          user.gender = 'male'
          return user
docs: Find user by his id and return user model.