带有客户参数的django表单中的键错误

Question

我有以下表格：

class QuestionForm(forms.Form):

    options = forms.ModelMultipleChoiceField(queryset=Option.objects.none(), 
                                    widget=forms.RadioSelect)


    def __init__(self, *args, **kwargs):
        question_id = kwargs.pop('question_id', None)
        super(QuestionForm, self).__init__(*args, **kwargs)

        if question_id:
            print question_id

            question = Question.objects.get(pk=question_id)
            ts = Option.objects.filter(question = question)
            for t in ts:
                print t.name
            self.fields['options'].queryset = Option.objects.filter(question = question)

    def clean(self):
        print 'in clean'
        #this is the last thing to print before failing
        cleaned_options = self.cleaned_data['options']
        try:
            print cleaned_options
            raise forms.ValidationError('That is not the right answer.  Try again.')
        except:
            return cleaned_options

我在我看来这样称呼它：

if request.method == "POST":
        print 'in post'
        form = QuestionForm(request.POST, question_id=question.id)
        print '---'
        options = request.POST.getlist('options')
        option = options[0]
        print option
        if form.is_valid():
            print '******'
            print form
        else:
            print '######'
            print form.errors

我的模板如下所示：

<form action="" method="post">
    {% csrf_token %}
    {{ form }}
    {{ form.errors }}
    <br />
    <button type="submit">Save</button>
</form>

我在使用Form的行的模板中遇到一个关键错误：

抛出错误的行似乎是：

cleaned_options = self.cleaned_data['options']

Answer 1

您永远不会在视图中返回HttpResponse。

试试这个：

if request.method == "POST":
        print 'in post'
        form = QuestionForm(request.POST, question_id=question.id)
        print '---'
        options = request.POST.getlist('options')
        option = options[0]
        print option
        if form.is_valid():
            print '******'
            print form
            return HttpResponseRedirect('/admin/')
 else:
     form=QuestionForm()
     return render(request,'myapp/form.html',{'form':form})

Answer 2

覆盖clean()方法时，您应该使用super()。这会调用clean()的继承功能。所以你的表格应该是这样的：

class QuestionForm(forms.Form):
    # for logic
    def clean(self):
        super(QuestionForm, self).clean()
        # get the initial 'cleaned_data' Dict from the form
        cleaned_data = self.cleaned_data
        # clean it however you wish, just make sure to return it at the end of clean()
        return cleaned_data

同样如上所述的“脑风暴”，观点必须返回Http Responses。