class MixinCreate():
    form_model = None
    template = None
    redirect_url = None
    sum_amaunt = None
    url_post = None

    def get(self, request):
        raise NotImplementedError(
            form = self.form_model()
            return render(request, self.template, {'form': form, 'url_post': self.url_post})
        )

    def post(self, request):
        bound_form = self.form_model(request.POST)
        if bound_form.is_valid():
            bound_form.save()
            return redirect(self.redirect_url)
        return render(request, self.template, {'form': bound_form, 'url_post': self.url_post})