django 中视图.as_view 函数求详解

[ray1888]

看过了 as_view()的源码，还是不是太明白这个函数后面的 update_wrapper 怎样去使得视图运行然后生产 HttpResponse ，有大神懂的话求科普，刚刚上手框架的小白求答案

[ray1888]

在这里贴上源码，方便大神来教导
def as_view(cls, **initkwargs):
"""
Main entry point for a request-response process.
"""
for key in initkwargs:
if key in cls.http_method_names:
raise TypeError("You tried to pass in the %s method name as a "
"keyword argument to %s(). Don't do that."
% (key, cls.__name__))
if not hasattr(cls, key):
raise TypeError("%s() received an invalid keyword %r. as_view "
"only accepts arguments that are already "
"attributes of the class." % (cls.__name__, key))

def view(request, *args, **kwargs):
self = cls(**initkwargs)
if hasattr(self, 'get') and not hasattr(self, 'head'):
self.head = self.get
self.request = request
self.args = args
self.kwargs = kwargs
return self.dispatch(request, *args, **kwargs)
view.view_class = cls
view.view_initkwargs = initkwargs

# take name and docstring from class
update_wrapper(view, cls, updated=())

# and possible attributes set by decorators
# like csrf_exempt from dispatch
update_wrapper(view, cls.dispatch, assigned=())
return view

[honmaple]

打个断点，一步一步的看执行的流程,你就明白了