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

hello guys idea solve error, using django framework develop simple application using class based views.

here view codes:

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 not none:                 if obj.is_active():                     login(self.request, obj)                     if next_url not none:                         return httpresponseredirect(next_url)                     else:                         return httpresponseredirect(reverse('index'))                 else:                     messages.error(self.request, 'error! sorry account not active')                     return httpresponseredirect(reverse('signin'))             else:                 messages.error(self.request, 'error!, sorry account not found')                 return httpresponseredirect(reverse('signin'))         else:             messages.error(self.request, 'sorry! 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 

and here form class:

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 not exist'             return false         if not check_password(self.cleaned_data['password'], user.password):             self._errors['invalid_password'] = 'password invalid'             return false         return true 

after submitting form end following error:

unbound method is_valid() must called userloginform instance first argument (got nothing instead) 

where mistake? out

you have couple of problems here, 1 that's causing immediate error:

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

self.form_class reference class, not form instance. should construct form instance based on request, , validate that:

form = self.form_class(request.post) 

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