Question

我无法弄清楚如何为我的formset进行自定义验证。我试图阻止用户在同一年选择超过12次，但是当我打印它时，cleaning_data作为每个表单的不同字典进入。

我希望将所有表格分成1个字典，以检查一年是否出现超过12次，或以更好的方式写出来。

我的代码：

forms.py

class SellerResultForm(forms.ModelForm):

    class Meta:
        model = SellerResult
        fields = ('month', 'year', 'result',)
        widgets = {
            'month': forms.Select(attrs={'class': 'form-control',}),
            'year': forms.Select(attrs={'class': 'form-control',}),
            'result': forms.TextInput(attrs={'class': 'form-control',}),
        }

    def has_changed(self): #used for saving data from initial
        changed_data = super(SellerResultForm, self).has_changed()
        return bool(self.initial or changed_data)

    def clean(self):
        cleaned_data = super(SellerResultForm, self).clean()
        print(cleaned_data)
        # prints a set of dictionaries
        # {'month': 4, 'year': 2017, 'id': 1, 'result': 1000}
        # {'month': 5, 'year': 2017, 'id': 1, 'result': 1000}
        # {'month': 6, 'year': 2017, 'id': 1, 'result': 1000}

views.py

def seller_result(request, user_id):

    SellerResultFormSet = modelformset_factory(SellerResult, form=SellerResultForm, extra=1, max_num=1)

    queryset = SellerResult.objects.filter(seller=user_id,).order_by('year', 'month')
    formset = SellerResultFormSet(request.POST or None,
                                           queryset=queryset,
                                           initial=[
                                           {'month': datetime.now().month,
                                           'year': datetime.now().year,
                                           'result': 1000,}])

    if formset.is_valid():
        instances = formset.save(commit=False)
        for instance in instances:
            instance.seller_id = user_id
            instance.save()

    context = {
        'formset': formset,
        }
    return render(request, 'app/seller_result.html', context)

Answer 1

管理以使其工作，下面的完整工作代码：

forms.py

class SellerResultForm(forms.ModelForm):

    class Meta:
        model = SellerResult
        fields = ('month', 'year', 'result',)
        widgets = {
            'month': forms.Select(attrs={'class': 'form-control',}),
            'year': forms.Select(attrs={'class': 'form-control',}),
            'result': forms.TextInput(attrs={'class': 'form-control',}),
        }

    def has_changed(self): #used for saving data from initial
        changed_data = super(SellerResultForm, self).has_changed()
        return bool(self.initial or changed_data)

    #no clean method here anymore

class BaseSellerResultFormSet(BaseModelFormSet):
    def clean(self):
        super(BaseSellerResultFormSet, self).clean()

        years = []
        for form in self.forms:
            year = form.cleaned_data['year']
            years.append(year)
        if years.count(2017) > 12:
            raise forms.ValidationError('You selected more than 12 months for 2017')

然后我很难在我的模板中渲染此ValidationError，错误可以在{{ formset.non_form_errors }}而不是{{ formset.errors }}中提供，正如我最初预期的那样。

Answer 2

覆盖formset的clean方法。 self.forms将包含所有表单。

Django中formset的自定义验证

2 个答案: