python - django不能在基于类的 View 中使用全局变量

我的看法是这样的

class RecordView(View):
    record_form = RecordForm
    record_files = {}
    templare = 'acquisition.html'

    def get(self, request, *args, **kwargs):
        fil = urllib.urlopen('/home/student/wwww.jpg')
        self.record_files = {'small_cover': SimpleUploadedFile('hehe.jpg', fil.read())}
        rr_form = self.record_form()
        return render(request, self.template_name, {'rr_form': rr_form,
                                            })
    def post(self, request, *args, **kwargs):
        record = RecordForm(request.POST, self.record_files)
        record.save()
        HttpResponseRedirect('/')

在这里，我在get方法中填充了self.record_files。但是发布数据后，我看到self.record_files为空字典。我在这里感到困惑。我该怎么办。

最佳答案

您的视图实例的状态不会在get和post之间维护，因此在实例上设置record_files不会将其保留用于下一个请求。您需要将该逻辑放入dispatch方法中，或将信息存储在用户的session中。

class RecordView(View):
    record_form = RecordForm
    record_files = {}
    templare = 'acquisition.html'

    # dispatch is called before deciding whether to use get() or post()
    # so any instance-level properties that require the request can go here.
    # This could even go in __init__().
    def dispatch(self, request, *args, **kwargs):
        fil = urllib.urlopen('/home/student/wwww.jpg')
        self.record_files = {'small_cover': SimpleUploadedFile('hehe.jpg', fil.read())}
        return super(RecordView, self).dispatch(request, *args, **kwargs)

    def get(self, request, *args, **kwargs):
        rr_form = self.record_form()
        return render(request, self.template_name, {'rr_form': rr_form,
                                        })

    # self.record_files will be available in a get, or a post (or any valid
    # method for that matter).
    def post(self, request, *args, **kwargs):
        record = RecordForm(request.POST, self.record_files)
        record.save()
        return HttpResponseRedirect('/')

关于python - django不能在基于类的 View 中使用全局变量，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/28248033/