Question

I'm trying to use Django signals in my application but the post_save signal is sending two times, and the post_delete is sending once like it's supposed to.

My signals.py:

@receiver([post_save,post_delete], sender=Award)
def print_request(sender, **kwargs):
    print('Request finished!')

The result in my terminal when I save an object:

Request finished!
Request finished!

My CreateView:

class ResearcherPrizeCreateView(LoginRequiredMixin, CreateView):
    model = Award
    form_class = ResearcherPrizeCreateForm
    success_url = reverse_lazy('prize_list')
    template_name = 'researcher/award/award_create_form.html'

    def form_valid(self, form):
        researcher = Researcher.objects.get(user_id=self.request.user.id)
        self.object = form.save(commit=False)
        self.object.researcher = researcher
        self.object.save()
        return super(ResearcherPrizeCreateView, self).form_valid(form)

My form.py

class ResearcherPrizeCreateForm(forms.ModelForm):
    class Meta:
        model = Award
        fields = ('title', 'category')

        widgets = {
            'title':forms.TextInput(attrs={
                'class':'form-control',
                'placeholder':'Titulo da Premiação'
        }),
            'category':forms.Select(attrs={
                'class':'form-control',                
        })
    }

Answer 1

当您致电self.object.save()时，该对象会被保存一次，而当您致电super().form_valid(form)时，该对象会被保存。

一种选择是在form_valid方法中重定向。

def form_valid(self, form):
    researcher = Researcher.objects.get(user_id=self.request.user.id)
    self.object = form.save(commit=False)
    self.object.researcher = researcher
    self.object.save()
    return redirect(self.success_url)

另一个选择是将研究人员分配给表单实例，然后调用super(...).form_valid()来保存表单并重定向。

def form_valid(self, form):
    researcher = Researcher.objects.get(user_id=self.request.user.id)
    form.instance.researcher = researcher
    return super(ResearcherPrizeCreateView, self).form_valid(form)

Django signal is sending two times

1 个答案: