'CheckoutView' 對象有沒有屬性 '對象'

Question

我越來越沒有屬性 '對象' 錯誤」

這裏是views.py

class CheckoutView(FormMixin , DetailView): 
    model = Cart 
    template_name = "carts/checkout_view.html" 
    form_class = GuestCheckoutForm 


    def get_object(self , *args , **kwargs): 
     if self.request.user.is_authenticated(): 
      try: 
       cart = Cart.objects.get(user__username=self.request.user) 
      except: 
       cart = None 

      if cart == None: 
       HttpResponseRedirect(reverse("cart")) 

     else: 
      cart_id = self.request.session.get("cart_id") 
      if cart_id == None: 
       HttpResponseRedirect(reverse("cart")) 

      cart = Cart.objects.get(id=cart_id) 

     return cart 

    def get_context_data(self ,*args , **kwargs): 
     context = super(CheckoutView , self).get_context_data(*args , **kwargs) 
     user_can_continue = False 
     if not self.request.user.is_authenticated(): 
      context["login_form"] = AuthenticationForm() 
      context["next_url"] = self.request.build_absolute_uri() 
     if self.request.user.is_authenticated(): 
      user_can_continue = True 

     context["user_can_continue"] = user_can_continue 
     context["form"] = self.get_form() 
     return context 

    def post(self , request , *args , **kwargs): 
     form = self.get_form() 
     if form.is_valid(): 
      email = form.cleaned_data.get("email") 
      return self.form_valid(form) 
     else: 
      return self.form_invalid(form) 

    def get_success_url(self): 
     return reverse('checkout') 

這裏是模板

<form method="POST" action=""> 
{% csrf_token %} 
{{form | crispy }} 
<input type="submit" class="btn btn-success" value="continue"> 
</form> 
</div> 

這裏是追溯

File "C:\Python27\lib\site-packages\django\core\handlers\base.py" in get_response 
    132.      response = wrapped_callback(request, *callback_args, **callback_kwargs) 
File "C:\Python27\lib\site-packages\django\views\generic\base.py" in view 
    71.    return self.dispatch(request, *args, **kwargs) 
File "C:\Python27\lib\site-packages\django\views\generic\base.py" in dispatch 
    89.   return handler(request, *args, **kwargs) 
File "C:\Users\lenovo\Desktop\plump\Plumpin\src\carts\views.py" in post 
    151.   return self.form_invalid(form) 
File "C:\Python27\lib\site-packages\django\views\generic\edit.py" in form_invalid 
    115.   return self.render_to_response(self.get_context_data(form=form)) 
File "C:\Users\lenovo\Desktop\plump\Plumpin\src\carts\views.py" in get_context_data 
    133.  context = super(CheckoutView , self).get_context_data(*args , **kwargs) 
File "C:\Python27\lib\site-packages\django\views\generic\detail.py" in get_context_data 
    101.   if self.object: 

Exception Type: AttributeError at /checkout/ 
Exception Value: 'CheckoutView' object has no attribute 'object' 

ho我能解決上述問題嗎？ 在這裏，我嘗試使用POST方法提交表單，但我得到上述錯誤

謝謝

Answer 1

您需要分配object到您的視圖的post方法使用.get_object()你的看法。

這是因爲Django的get_context_data()函數使用object將它傳遞到上下文中。如果POST請求發生錯誤，將調用此函數，它會查找您未分配的self.object，從而導致錯誤。

class CheckoutView(FormMixin , DetailView): 
    model = Cart 
    template_name = "carts/checkout_view.html" 
    form_class = GuestCheckoutForm 

    ... 

    def post(self , request , *args , **kwargs): 
     self.object = self.get_object() # assign the object to the view 
     form = self.get_form() 
     if form.is_valid(): 
      email = form.cleaned_data.get("email") 
      return self.form_valid(form) 
     else: 
      return self.form_invalid(form) 

而且，這將是更好地使用的DetailViewUpdateView這裏代替。