在基于 class 的视图中使用 get 方法访问 form.cleaned_data

Question

我有一种情况，我应该首先向用户显示一个表单，用户在其中填写两个字段，然后根据表单字段查询数据库并向用户显示对象列表。
但问题是我使用基于 class 的视图，我无法在我的 get 方法中访问清理后的数据。我知道必须在 post 方法中处理表单而不是 get 方法，所以我无法在 get 方法中处理表单。
这是我的代码：

views.py

class IncomeTransactionReport(LoginRequiredMixin, ListView):
    def post(self, request, *args, **kwargs):
        # here I get form from post request
        form = IncomeReportForm(request.POST)
        # if form is valid redirect user to the same page to show the results based on the filled
        # in form  fields 'from_date' and 'to_date'
        if form.is_valid():
            from_date = form.cleaned_data['from_date']
            to_date = form.cleaned_data['to_date']
            return redirect('income_report')
        # else render the same page with the form and form errors
        else:
            error_message = 'Please solve the error and try again'
            return render(request, 'report_income.html', context={'error_message': error_message,
            'form': form}, status=422)

    def get(self, request, *args, **kwargs):
        # here I need to access 'from_date' and 'to_date' to query the database and show the results
        # in paginated pages to the user
        if from_date != None and to_date != None:
            incomes = Income.objects.filter(user=user,
            date__gte=datetime.date.fromisoformat(from_date),
            date__lte=datetime.date.fromisoformat(to_date)).all()
        elif from_date != None:
            incomes = Income.objects.filter(user=user,
            date__gte=datetime.date.fromisoformat(from_date),
            date__lte=datetime.date.fromisoformat(from_date) + \
            relativedelta.relativedelta(months=+1)).all()
        else:
            incomes = Income.objects.filter(user=user).all()
        page = request.POST.get('page', 1)
        paginator = Paginator(incomes, 5)
        try:
            incomes = paginator.page(page)
        except PageNotAnInteger:
            incomes = paginator.page(1)
        except EmptyPage:
            incomes = paginator.page(paginator.num_pages)
        message = 'This is your requested list of incomes'
        # here I return the results
        return render(request, 'report_income.html', {'message': message, 'incomes': incomes})

如果您需要更多信息，请在此处 post 告诉我。

Answer 1

为了回答您的问题，我将只描述 Django 中正确的表单处理。但看在上帝的份上，请不要 post 在阅读完美解释所有内容的文档之前提出此类问题 here 这是如何处理其中包含表单的视图的示例：

SomeClassBasedView(TemplateView):

    template_name = 'some_template.html'

    def get(self, request):
        # some custom get processing
        form = SomeForm()  # inhereting form.Form or models.ModelForm
        context = { 'form': form,
                    # other context
                   }
        return render(request, self.template, context)

    def post(self, request):

        # this works like 'get data from user and populate form'
        form = SomeForm(request.POST)

        if form.is_valid():
            # now cleaned_data is created by is_valid
            # example:
            user_age = form.cleaned_data['age']
            # some other form proccessing
            context = {
                'form': SomeForm(),
                # other context
            }
            return render(request, self.template, context)

        # if there were errors in form
        # we have to display same page with errors
        context = {
            'form': form,
            # other context
        }
        return render(request, self.template, context)

Answer 2

经过深入的搜索和思考，我发现最好的办法是将表单清理后的数据放入会话中，然后使用其他方法（例如 get 方法）访问它。

在基于 class 的视图中使用 get 方法访问 form.cleaned_data

Accessing form.cleaned_data in get method in class based views

python

django

django-forms

django-class-based-views