django-为什么重定向后,表单显示"无"

Question

我有一个表单,在输入信息后,根据信息过滤数据库并进行一些计算,最后将结果显示给重定向的URL.

我确实可以重定向到另一个URL并成功显示结果.但问题在于它无法显示用户提交的任何数据,只显示每个字段的内容,结果不是基于fitered queryset.让我们说总和,它只是总结数据库中的所有列,而不使用过滤结果.

我怀疑查询集没有将过滤后的结果传递给def get_context_data,因此get_context_data中的查询集不起作用.

如果你解开我的疑问,真的非常感谢你.

(我根据建议合并了2个类的EDIT版本,希望有人能纠正这个EDIT版本,谢谢)

urls.py

url(r'^result_list/$',ResultView.as_view(),name='result'),
url(r'^input/$',InputFormView.as_view(),name='input'),

views.py

class InputFormView(request):
#class InputFormView(FormView):
    template_name = 'inputform.html'
    form_class = InputForm

    response = HttpResponse( 'result' )
    request_form_data = request.POST #you need to sanitize/clear this data
    response.set_cookie('form_data', request_form_data)

#redirect to result page with submitted form information

    def get_success_url(self):
        return ''.join(
        [
            reverse('result'),
            '?company=',self.request.POST.get('company'),  <--do I need to change "POST" into "USER"?
            '&region=',self.request.POST.get('region')
        ]
        )

#class ResultView(ListView):
class ResultView(request):
    context_object_name = 'result_list'
    template_name = 'result_list.html'
    model = Result

    def get_context_data(self, **kwargs):
        context = super(ResultView, self).get_context_data(**kwargs)
        context["sales"] = self.get_queryset().aggregate(Sum('sales'))
        context["company"] = self.request.POST.get("company")
        context["region"] = self.request.POST.get("region")

        return context

    def get_queryset(self):
        if self.request.method == 'POST': 
            form = InputForm(self.request.POST)
            if form.is_valid():
                company = form.cleaned_data['company']
                region = form.cleaned_data['region']

                queryset=Result.objects.filter(region=region)
                return queryset
        return Result.objects.all()

    if request.COOKIES.has_key('form_data'):
        value = request.COOKIES['form_data'] #this data also should be sanitized

HTML

<div class="basicinfo">         <!--Entry Form information submitted by user-->
    <table border="1" cellpadding="1">
    <tr>
        <td align="left">Company</td>
        <td>{{ company }}</td>
    </tr>
    <tr>
        <td align="left">Region</td>
        <td>{{ region }}</td>
    </tr>
  </table>
</div>     

<!--Showing the filtered result in database-->  
<td><table border="0" cellspacing="10" cellpadding="10">
<tr><b>Sales</b></tr>
<td bgcolor="#F0F0F0"> {{ sales.sales__sum }}</td>

</tr>
<tr><b>Employee</b></tr>
<tr>
<td bgcolor="#F0F0F0"> {{ employee.employee__sum }}</td>

</table>

编辑 - 结合2类视图

import urllib

#@csrf_exempt

class ResultView(ListView):
    context_object_name = 'result_list'
    template_name = 'result_list.html'
    model = Result

    def get_queryset(self):
        form = InputForm(self.request.GET)
        if form.is_valid():
            company = form.cleaned_data['company']
            region = form.cleaned_data['region']         
            queryset=Result.objects.filter(region=region)
            return queryset
        return Result.objects.all()

    def get_success_url(self):
        params = {
            'company': self.request.POST.get('company'),
            'region': self.request.POST.get('region')
        }
        return ''.join([reverse('result'), '?', urllib.urlencode(params.items())])

    def get_context_data(self,**kwargs):
            context = super(ResultView, self).get_context_data(**kwargs)
            context["sales"] = self.get_queryset().aggregate(Sum('sales'))         
            context["company"] = self.request.GET.get("company")
            context["region"] = self.request.GET.get("region")       
            return context

**EDIT- urls.py**

url(r'^result_list/$',ResultView.as_view(),name='result'),----for the result page
url(r'^input/$',result.views.get_success_url,name='input') -----for the form, I am not sure if this line correct or not?

Answer 1

如果您将get_queryset方法更改为：您的代码应该可以工作：

def get_queryset(self):
    # You are sending GET params here, not POST
    form = InputForm(self.request.GET)
    if form.is_valid():
        company = form.cleaned_data['company']
        region = form.cleaned_data['region']

        queryset=Result.objects.filter(region=region)
        return queryset
    return Result.objects.all()

以及您的get_context_data方法：

def get_context_data(self, **kwargs):
    context = super(ResultView, self).get_context_data(**kwargs)
    context["sales"] = self.get_queryset().aggregate(Sum('sales'))
    # Your variables are in GET, not POST
    context["company"] = self.request.GET.get("company")
    context["region"] = self.request.GET.get("region")
    return context

也就是说，您的代码可以进行一些重构。您真的需要FormView接受 POST 请求吗？您可以使用一个通过 GET 直接提交到结果视图的表单。

使用您当前的方法，您实际上会处理表单两次 - 每个视图一次。

编辑：此外，您生成重定向网址的方式并不安全。你应该这样：

import urllib
def get_success_url(self):
    params = {
        'company': self.request.POST.get('company'),
        'region': self.request.POST.get('region')
    }

    return ''.join([reverse('result'), '?', urllib.urlencode(params.items())])