如何显示自己的订单列表

Question

我想显示单个用户的所有订单。此代码运行良好。但问题是，当我注销时，会显示以下错误。甚至连上一页都没有。现在，我能做什么？

错误：

AttributeError at /
'AnonymousUser' object has no attribute 'user_frontend_order'
Request Method: GET
Request URL:    http://127.0.0.1:8000/
Django Version: 3.2.3
Exception Type: AttributeError
Exception Value:    
'AnonymousUser' object has no attribute 'user_frontend_order'
Exception Location: C:UsersDCLAppDataLocalProgramsPythonPython39libsite-packagesdjangoutilsfunctional.py, line 247, in inner
Python Executable:  C:UsersDCLAppDataLocalProgramsPythonPython39python.exe
Python Version: 3.9.5
Python Path:    
['D:\1_WebDevelopment\Business_Website',
'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',
'C:\Users\DCL\AppData\Roaming\Python\Python39\site-packages',
'C:\Users\DCL\AppData\Roaming\Python\Python39\site-packages\win32',
'C:\Users\DCL\AppData\Roaming\Python\Python39\site-packages\win32\lib',
'C:\Users\DCL\AppData\Roaming\Python\Python39\site-packages\Pythonwin',
'C:\Users\DCL\AppData\Local\Programs\Python\Python39\lib\site-packages']
Server time:    Sun, 13 Mar 2022 18:12:22 +0000
Traceback Switch to copy-and-paste view
C:UsersDCLAppDataLocalProgramsPythonPython39libsite-packagesdjangocorehandlersexception.py, line 47, in inner
response = get_response(request) …
▶ Local vars
C:UsersDCLAppDataLocalProgramsPythonPython39libsite-packagesdjangocorehandlersbase.py, line 181, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs) …
▶ Local vars
D:1_WebDevelopmentBusiness_Websitebusiness_appviews.py, line 16, in index
queryset = request.user.user_frontend_order.all() …

视图：

def index(request):
total_user = User.objects.count()-1
frontend_order_list = request.user.user_frontend_order.all()

context = {
"total_user":total_user,
"frontend_order_list":frontend_order_list
}
return render(request,'0_index.html',context)

型号：

class Frontend_Order(models.Model):
USer = models.ForeignKey(User,default=None,on_delete=models.CASCADE,related_name='user_frontend_order')
Service_Type = models.CharField(max_length=250, null=True)
Price = models.CharField(max_length=250, null=True)
def __str__(self):
return str(self.pk)+ str(".") + str(self.USer)

Answer 1

它将转到上一页。问题是，在评估索引的逻辑时，存在一个问题：它旨在找到用户的Frontend_Order对象，但request.user不是User对象，而是AnonymousUser对象。因此，您应该进行适当的检查：

def index(request):
total_user = User.objects.count()-1

ifrequest.user.is_authenticated:
frontend_order_list = request.user.user_frontend_order.all()
else:
frontend_order_list = Frontend_Order.objects.none()

context = {
'total_user': total_user,
'frontend_order_list': frontend_order_list
}
return render(request, '0_index.html', context)

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注意：通常最好使用settings.AUTH_USER_MODEL^[Django-doc]来引用用户模型，而不是直接使用User模型^{Django-dok]分。}

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注意：Django中的模型是用PascalCase编写的，而不是用snake_case，因此，您可能希望将模型从Frontend_Order重命名为FrontendOrder。