What did mean by AttributeError at /login_user/? - django

Question

My target is to get all the products a user added to the cart, that's why I decided to fetch the ShopingCart model from the context processor. And I added it to the context processor, and it worked well. But the problem is when I try to log out, then I get an error. Where did the actual problem occur? 😢...
models.py:
class ShopingCart(models.Model):
User = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='UserShoppingCartRelatedName',on_delete=models.CASCADE)
Product = models.ForeignKey(Products, related_name='ShoppingCartRelatedName',on_delete=models.CASCADE)
context_processors:
def ShoppingCart(request):
return {"ShoppingCart":request.user.UserShoppingCartRelatedName.all()}
error:
AttributeError at /login_user/
'AnonymousUser' object has no attribute 'UserShoppingCartRelatedName'
Request Method: GET
Request URL: http://127.0.0.1:8000/login_user/
Django Version: 4.0.4
Exception Type: AttributeError
Exception Value:
'AnonymousUser' object has no attribute 'UserShoppingCartRelatedName'
Exception Location: D:\1_WebDevelopment\17_Ecomerce Website\ecomerce site\env\lib\site-packages\django\utils\functional.py, line 259, in inner
Python Executable: D:\1_WebDevelopment\17_Ecomerce Website\ecomerce site\env\Scripts\python.exe
Python Version: 3.9.5
Python Path:
['D:\\1_WebDevelopment\\17_Ecomerce Website\\ecomerce site',
'c:\\users\\dcl\\appdata\\local\\programs\\python\\python39\\python39.zip',
'c:\\users\\dcl\\appdata\\local\\programs\\python\\python39\\DLLs',
'c:\\users\\dcl\\appdata\\local\\programs\\python\\python39\\lib',
'c:\\users\\dcl\\appdata\\local\\programs\\python\\python39',
'D:\\1_WebDevelopment\\17_Ecomerce Website\\ecomerce site\\env',
'D:\\1_WebDevelopment\\17_Ecomerce Website\\ecomerce '
'site\\env\\lib\\site-packages']
Server time: Tue, 09 Aug 2022 11:48:23 +0000

Answer 1

Check if user is not none and authenticated.
def ShoppingCart(request):
if request.user is not None and request.user.is_authenticated():
return {"ShoppingCart":request.user.UserShoppingCartRelatedName.all()}
else:
return {}

Answer 2

It looks as if you are not logged in!
You must login before you can access the user atrubute.
If you are not loged in it says you are 'AnonymousUser'
'AnonymousUser' object has no attribute 'UserShoppingCartRelatedName'
Login and then try it!!