code: def _apply_decorator_to_methods(cls, decorator):
          
          for method in cls.methods:
              method_name = method.lower()
              decorated_method_func = decorator(getattr(cls, method_name))
              setattr(cls, method_name, decorated_method_func)
docs: This helper can apply a given decorator to all methods on the current
          Resource.
  
          NOTE: In contrast to ``Resource.method_decorators``, which has a
          similar use-case, this method applies decorators directly and override
          methods in-place, while the decorators listed in
          ``Resource.method_decorators`` are applied on every request which is
          quite a waste of resources.