DRF 视图的方法继承

Question

考虑：

class CourseListViewBase():
   def list(self, request, format=None):
      # whatever

class CourseListView(generics.ListAPIView, CourseListViewBase):
   permission_classes = [IsAuthenticated]
   def list(self, request, format=None): # Why can't I omit this?
      return CourseListViewBase.list(self, request, format)

class CourseListViewGuest(generics.ListAPIView, CourseListViewBase):
   permission_classes = []
   authentication_classes = []
   def list(self, request, format=None): # Why can't I omit this?
      return CourseListViewBase.list(self, request, format)

为什么我必须在派生类中定义

list

方法而不是依赖它从基类继承？如果我不定义它，我会收到这样的警告：

AssertionError: 'CourseListViewGuest' 应该包含一个

queryset

属性，或者覆盖

get_queryset()

方法。

Answer 1

问题出在我列出基类的顺序上。似乎

generics.ListAPIView

也定义了一个（退化的）

list

方法。所以，这有效：

class CourseListViewBase():
   def list(self, request, format=None):
      # whatever

class CourseListView(CourseListViewBase, generics.ListAPIView):
   permission_classes = [IsAuthenticated]

class CourseListViewGuest(CourseListViewBase, generics.ListAPIView):
   permission_classes = []
   authentication_classes = []