class RegistrationView(View):
    template_name = 'registration.html'

    def get(self, request):
        form = UserCreationForm(request.POST)
        return render(request, self.template_name, {'form': form})

    def post(self, request, *args, **kwargs):
        form = UserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            username = form.cleaned_data.get('username')
            raw_password = form.cleaned_data.get('password1')
            user = authenticate(username=username, password=raw_password)
            login(request, user)
            return redirect('main_page')
        return render(request, self.template_name, {'form': form})