viewsets
ViewSetMixin
重写as_view() GenericViewSet
继承自GenericAPIView继承自ViewSetMixin ViewSet
继承自APIView继承自ViewSetMixin默认啥都不支持，需要自己手动实现 ReadOnlyModelViewSet
只读的模型的视图集合继承自RetrieveModelMixin继承自ListModelMixin继承自GenericViewSet ModelViewSet
直接封装对象的所有操作继承自GenericViewSet继承自CreateModelMixin继承自RetrieveModelMixin继承自UpdateModelMixin继承自DestroyModelMixin继承自ListModelMixin
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