python - 在哪里/如何替换 Django CBV 中的默认上传处理程序？

Question

我正在尝试为基于类的 View 指定处理文件上传的特定方法。根据 docs这可以通过类似的方式实现:

from django.core.files.uploadhandler import TemporaryFileUploadHandler
request.upload_handlers = [TemporaryFileUploadHandler(request=request)]

如果我在 FormView 的 post 方法中指定它，如下所示:

def post(self, request, *args, **kwargs):
    request.upload_handlers = [TemporaryFileUploadHandler(request=request)]
    return super().post(self,  request, *args, **kwargs)

我得到:

AttributeError: You cannot set the upload handlers after the upload has been processed.

类似的变体产生相同的结果:

def post(self, request, *args, **kwargs):
    self.request.upload_handlers = [TemporaryFileUploadHandler(request=self.request)]
    form = self.get_form()
    if form.is_valid():
        return self.form_valid(form)
    else:
        return self.form_invalid(form)

但是，当我在 get 方法中执行此操作时，这是无效的:

 def get(self, request, *args, **kwargs):
    request.upload_handlers = [TemporaryFileUploadHandler(request=self.request)]  
    return super().get(self,  request, *args, **kwargs)

如果我上传一个小文件，它仍然使用默认的 django.core.files.uploadhandler.MemoryFileUploadHandler。

我做错了什么？

编辑

此外，当我尝试反射(reflect) note 中的建议时, 我得到相同的 AttributeError:

from django.views.decorators.csrf import csrf_exempt, csrf_protect

@csrf_exempt
def post(self, request, *args, **kwargs):
    request.upload_handlers = [TemporaryFileUploadHandler(request=request)]
    return self._post(request, *args, **kwargs)

@csrf_protect
def _post(self, request, *args, **kwargs):
    form = self.get_form()
    if form.is_valid():
        return self.form_valid(form)
    else:
        return self.form_invalid(form)

Answer 1

好的，终于让它工作了(使用@Alasdair 提供的建议)。在 post 上设置一个 method decorator(crsf_exempt) 是不够的，它需要在 dispatch 上。对于将来为此苦苦挣扎的任何人，它是这样的:

from django.views.generic import FormView
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_exempt, csrf_protect


@method_decorator(csrf_exempt, 'dispatch')
class UploadDataSetView(FormView):

    def post(self, request, *args, **kwargs):
        request.upload_handlers = [TemporaryFileUploadHandler(request=request)]  
        return self._post(request)

    @method_decorator(csrf_protect)
    def _post(self, request):
        form = self.get_form()
        if form.is_valid():
            return self.form_valid(form)
        else:
            return self.form_invalid(form)

如果您从模板中删除 {% csrf_token %}(这正是您想要的)，它也会失败。