未绑定的方法is_valid（）必须调用UserLoginForm实例作为第一个参数

Question

你好家伙有想法的人有助于解决这个错误，我正在使用Django框架开发一个简单的应用程序使用基于类的视图。

这里是我查看代码：

class OpenLogin(FormView): 
    template_name = 'signin.html' 
    form_class = UserLoginForm 

    def post(self, request, *args, **kwargs): 
     form = self.form_class 
     next_url = self.request.GET.get('next') 
     if form.is_valid(): 
      username = form.cleaned_data.get('username') 
      password = form.cleaned_data.get('password') 

      obj = authenticate(username=username, password=password) 
      if obj is not None: 
       if obj.is_active(): 
        login(self.request, obj) 
        if next_url is not None: 
         return HttpResponseRedirect(next_url) 
        else: 
         return HttpResponseRedirect(reverse('index')) 
       else: 
        messages.error(self.request, 'Error! sorry account is not active') 
        return HttpResponseRedirect(reverse('signin')) 
      else: 
       messages.error(self.request, 'Error!, sorry account is not found') 
       return HttpResponseRedirect(reverse('signin')) 
     else: 
      messages.error(self.request, 'Sorry! an error occurred, try again') 
      context = { 
       'title': 'Sign In', 
       'next_url': next_url, 
       'messages': messages.get_messages(self.request), 
       'user': self.request.user, 
       'form':form, 
      } 

      return context 

，这里是我的表单类：

unbound method is_valid() must be called with UserLoginForm instance as first argument (got nothing instead) 

：

class UserLoginForm(forms.Form): 
    username = forms.CharField(max_length=User._meta.get_field('email').max_length) 
    password = forms.CharField(min_length=6, max_length=16, widget=forms.PasswordInput()) 

    def is_valid(self): 
     valid = super(UserLoginForm, self).is_valid() 
     if not valid: 
      return valid 
     try: 
      user = User.objects.get(
       Q(username=self.cleaned_data['username']) | Q(email=self.cleaned_data['username']) 
      ) 
     except User.DoesNotExist: 
      self._errors['no_user'] = 'User does not exist' 
      return False 
     if not check_password(self.cleaned_data['password'], user.password): 
      self._errors['invalid_password'] = 'Password is invalid' 
      return False 
     return True 

提交我结束了以下错误表格后我的错误在哪里？帮帮忙

Answer 1

你有一对夫妇在这里的问题，但是这是造成你的即时错误之一：

form = self.form_class 
... 
if form.is_valid(): 

self.form_class是对类的引用，而不是一个表单实例。你应该根据你的要求构建一个表单实例，并验证：

form = self.form_class(request.POST)