admin.py 文件源码

def add_view(self, request, form_url='', extra_context=None):
        # Prepopulate new configuration entries with the value of the current config, if given:
        if 'source' in request.GET:
            get = request.GET.copy()
            source_id = int(get.pop('source')[0])
            source = get_object_or_404(self.model, pk=source_id)
            source_dict = models.model_to_dict(source)
            for field_name, field_value in source_dict.items():
                # read files into request.FILES, if:
                # * user hasn't ticked the "clear" checkbox
                # * user hasn't uploaded a new file
                if field_value and isinstance(field_value, File):
                    clear_checkbox_name = '{0}-clear'.format(field_name)
                    if request.POST.get(clear_checkbox_name) != 'on':
                        request.FILES.setdefault(field_name, field_value)
                get[field_name] = field_value
            request.GET = get
        # Call our grandparent's add_view, skipping the parent code
        # because the parent code has a different way to prepopulate new configuration entries
        # with the value of the latest config, which doesn't make sense for keyed models.
        # pylint: disable=bad-super-call
        return super(ConfigurationModelAdmin, self).add_view(request, form_url, extra_context)