Django我的表单不会保存添加的M2M对象。为什么？

Question

我的代码：

class DataSourceCreateView(CreateView):
    model = DataSource
    form_class = DataSourceForm
    template_name = 'engine/datasource_create.html'

    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        kwargs['user'] = self.request.user
        return kwargs

    def form_valid(self, form):

        f = form.save(commit=False)
        f.creator = self.request.user

        f.save()
        dsr_pk = form.cleaned_data['dataset_request']
        if dsr_pk != 'noval':
            print(dsr_pk)
            dsr = DatasetRequest.objects.get(pk=dsr_pk)
            f.dataset_requests.add(dsr)
            print(f)
            print(f.dataset_requests)
            f.save()

        return super(DataSourceCreateView, self).form_valid(form)

为什么我的表单不将dsr添加到f.dataset_requests？表单保存并继续，而不将dsr添加到f.dataset_requests。我在DataSourceForm中将dataset\u request字段设置为单个select字段，而不是多个select字段。提前谢谢

Answer 1

我认为您可以使用save_m2m来保存许多关系。您可以这样尝试：

class DataSourceCreateView(CreateView):
    model = DataSource
    form_class = DataSourceForm
    template_name = 'engine/datasource_create.html'

    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        kwargs['user'] = self.request.user
        return kwargs

    def form_valid(self, form):

        f = form.save(commit=False)
        f.creator = self.request.user
        f.save()
        form.save_m2m()
        return HttpResponseRedirect(self.get_success_url())  # Not calling Super here

Answer 2

最后重写了DataSourceForm的save方法以使其正常工作。你知道吗