Django REST Framework - get_queryset: 'MyModel' 对象没有属性 'model'

Question

我在 Django REST 框架中编辑查询集时遇到问题。基本上我需要过滤我的查询和 return 单个查询，所以我的 DRF 视图如下所示：

class MyModelViewSet(viewsets.ModelViewSet):
    queryset = MyModel.objects.all()
    serializer_class = MyModelSerializer

    def get_queryset(self):
        start = self.kwargs['start']
        end = self.kwargs['end']
        qs, created = MyModel.objects.get_or_create(start=start, end=end)
        return qs

所以我 return 单个模型实例，但是当我尝试访问真实的 DRF Web 界面时，我收到一个错误 'MyModel' object has no attribute 'model'

回溯：

File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/django/views/decorators/csrf.py" in wrapped_view
  58.         return view_func(*args, **kwargs)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/viewsets.py" in view
  85.             return self.dispatch(request, *args, **kwargs)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/views.py" in dispatch
  456.             response = self.handle_exception(exc)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/views.py" in dispatch
  444.             self.initial(request, *args, **kwargs)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/views.py" in initial
  359.         self.check_permissions(request)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/views.py" in check_permissions
  304.             if not permission.has_permission(request, self):
File "/Users/stay-wide-awake/code/asp/src/apps/api2/permission.py" in has_permission
  34.         perms = self.get_required_permissions(request.method, queryset.model)

Exception Type: AttributeError at /api/v2/geo/36.606111,-118.062778|36.578581,-120.291994/
Exception Value: 'MyModel' object has no attribute 'model'

路由器和所有其他部件都正常（通过打印测试:)）

如有任何提示，我们将不胜感激。

Answer 1

通过 MyModel.objects.get_or_create(start=start, end=end) 收到的 object 不是查询集，因此您会收到此错误。

Django 的 get_or_create() return 是一个 (object, created) 的元组，其中 object 是检索或创建的对象， created 是一个布尔值，指定是否是一个新对象已创建。

在您的 get_queryset() 方法中，您将查询集 qs 设置为收到的 object ，而实际上它是一个模型对象。

get_queryset() 应该 return 一个 queryset 而不是你正在做的模型对象。

您可以这样做：

def get_queryset(self):
    start = self.kwargs['start']
    end = self.kwargs['end']
    mymodel_obj, created = MyModel.objects.get_or_create(start=start, end=end)
    return MyModel.objects.filter(id=mymodel_obj.id) # returns a queryset now

Django REST Framework - get_queryset: 'MyModel' 对象没有属性 'model'

Django REST Framework - get_queryset: 'MyModel' object has no attribute 'model'

django

django-rest-framework