有人知道这段代码有什么问题吗？
def paginated_instance_method(default_page_size=25):
def wrap(func):
@functools.wraps(func)
def inner(self, page=1, page_size=default_page_size, *args, **kwargs):
objects = func(self=self, *args, **kwargs)
return _paginate(objects, page, page_size)
return inner
return wrap
class Event(object):
...
@paginated_instance_method
def get_attending_users(self, *args, **kwargs):
return User.objects.filter(pk__in=self.attending_list)
我收到以下错误:
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/Users/zarathustra/Virtual_Envs/hinge/hinge_services/hinge/api/decorators.py", line 108, in wrap
def inner(self, page=1, page_size=default_page_size, *args, **kwargs):
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/functools.py", line 33, in update_wrapper
setattr(wrapper, attr, getattr(wrapped, attr))
AttributeError: 'Event' object has no attribute '__name__'
我认为这可行的原因是，通过反复试验，我得到了以下装饰器，就像类方法的魅力一样工作:
def paginated_class_method(default_page_size=25):
def wrap(func):
@functools.wraps(func)
def inner(cls, page=1, page_size=default_page_size, *args, **kwargs):
objects = func(cls=cls, *args, **kwargs)
return _paginate(objects, page, page_size)
return inner
return wrap
最佳答案
paginated_instance_method 不是装饰器，它是一个返回装饰器的函数。所以
@paginated_instance_method()
def get_attending_users(self, *args, **kwargs):
(注意括号。)
关于实例方法上的Python装饰器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15098424/