Django 在视图中定义get_queryset,属性错误
我正试图编写一个自定义的Django 在视图中定义get_queryset,属性错误,django,django-views,django-queryset,Django,Django Views,Django Queryset,我正试图编写一个自定义的get\u queryset函数,因为我想从'request.user.email'访问用户的电子邮件,并用它形成另一个查询,我想用我的视图cartv(generic.ListView)显示该查询。第一次在这里问问题,搜索了一下网站,但是没有发现任何类似的东西,但是如果你发现了什么,请直接告诉我,我会尽快删除这个 环境: Request Method: GET Request URL: http://192.168.24.169:8000/products/cart/
get\u queryset
函数,因为我想从'request.user.email'访问用户的电子邮件,并用它形成另一个查询,我想用我的视图cartv(generic.ListView)
显示该查询。第一次在这里问问题,搜索了一下网站,但是没有发现任何类似的东西,但是如果你发现了什么,请直接告诉我,我会尽快删除这个
环境:
Request Method: GET
Request URL: http://192.168.24.169:8000/products/cart/
Django Version: 3.1.2
Python Version: 3.6.9
Installed Applications:
['products.apps.ProductsConfig',
'accounts.apps.AccountsConfig',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Traceback (most recent call last):
File "/home/nirman/.local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)
File "/home/nirman/.local/lib/python3.6/site-packages/django/core/handlers/base.py", line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/nirman/.local/lib/python3.6/site-packages/django/views/generic/base.py", line 70, in view
return self.dispatch(request, *args, **kwargs)
File "/home/nirman/.local/lib/python3.6/site-packages/django/views/generic/base.py", line 98, in dispatch
return handler(request, *args, **kwargs)
File "/home/nirman/.local/lib/python3.6/site-packages/django/views/generic/list.py", line 142, in get
self.object_list = self.get_queryset()
File "/home/nirman/Desktop/login/products/views.py", line 91, in get_queryset
self.user = request.user
Exception Type: AttributeError at /products/cart/
Exception Value: 'cartv' object has no attribute 'user'
观点:
class cartv(generic.ListView):
model = cart
context_object_name = 'cart_list'
template_name='products/cartview.html'
def get_queryset(request):
qs = cart.objects.filter(user__email=request.user.email) #error points here
if qs.exists():
c = qs[0]
return c.items.all()
else:
return redirect('failure')
型号:
class cart_item(models.Model):
products = models.ManyToManyField(product)
quantity = models.IntegerField(null=False, default=1)
user = models.ManyToManyField(User)
class cart(models.Model):
items = models.ManyToManyField(cart_item)
user = models.ManyToManyField(User)
ordered = models.BooleanField(null=False, default=False)
您应该将
self
参数传递给get\u queryset
方法。然后,在self
参数中,您可以通过self.request
访问request
在您的案例中应该是这样的:
class cartv(generic.ListView):
model = cart
context_object_name = 'cart_list'
template_name='products/cartview.html'
def get_queryset(self):
qs = cart.objects.filter(user__email=self.request.user.email)
if qs.exists():
c = qs[0]
return c.items.all()
else:
return redirect('failure')
不接受参数请求
,它有一个参数self
(与任何对象方法一样)
此外,在这种情况下,重定向将不起作用。get\u queryset
应该返回queryset
,而不是重定向。例如,在这种情况下,您可以引发Http404
异常:
from django.http import Http404
class cartv(generic.ListView):
model = cart_item
context_object_name = 'cart_list'
template_name='products/cartview.html'
def get_queryset(self):
cart = cart.objects.filter(user=self.request.user)
try:
cart[0].items.all()
except IndexError:
raise Http404
从django.http导入Http404
类cartv(generic.ListView):
模型=购物车\商品
上下文\对象\名称='购物车\列表'
模板\u name='products/cartview.html'
def get_queryset(自我):
cart=cart.objects.filter(用户=self.request.user)
尝试:
购物车[0]。商品。全部()
除索引器外:
升起Http404
然而,首先使用cart[0]
有点“奇怪”。如果用户有多个购物车,那么为什么要返回第一个购物车?get\u queryset
不接受参数request
,参数是self
,而且重定向在这种情况下将不起作用。您能否共享购物车和商品模型(其中c.items
指的模型)请回答这个问题。