[英]How to add/modify an attribute to a Django class based view from a Decorator?
我有一個基於類的Django視圖,如下所示:
class myView(TemplateView):
template_name = 'templateFile.html'
request = None
@method_decorator(request_management)
def dispatch(self, request, *args, **kwargs):
...
return super(myView, self).dispatch(request, *args, **kwargs)
def get_context_data(self, *args, **kwargs):
ctx = super(newFeatures, self).get_context_data(**kwargs)
ctx['requester'] = self.requester
return ctx
在我的request_management裝飾器中,我想將myView.request的值設置為傳遞給調度函數的參數。 所以我做這樣的事情:
def request_management(function):
@wraps(function)
def decorator(*args, **kwargs):
logger.debug("request = %s" % str(args[0]))
# I want to say here something like:
# self.request = args[0]
# but of course, "self" is not defined in this context.
return function(*args, **kwargs)
return decorator
但是從裝飾器內部,我無法訪問裝飾方法的“自身”實例。 如何獲得該實例並將一個名為request的屬性附加到該實例,以便可以在該實例的其他方法中使用該屬性?
method_decorator
的目的是將函數裝飾器轉換為方法裝飾器 。 但是由於您正在編寫自己的裝飾器,因此可以繼續將其編寫為實際的方法裝飾器:
class myView(TemplateView):
@request_management
def dispatch(self, request, *args, **kwargs):
...
return super(myView, self).dispatch(request, *args, **kwargs)
def request_management(method):
@wraps(method)
def decorator(self, request, *args, **kwargs):
logger.debug("request = %s" % str(request))
self.request = request
return method(self, request, *args, **kwargs)
return decorator
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