DRF最高封装的子类视图

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• 子类视图：

视图	作用	方法	父类
ListAPIView	查询多条数据	get	GenericAPIView ListModelMixin
CreateAPIView	新增一条数据	post	GenericAPIView CreateModelMixin
RetrieveAPIView	查询一条数据	get	GenericAPIView RetrieveModelMixin
UpdateAPIView	修改一条数据	put，patch	GenericAPIView UpdateModelMixin
DestroyAPIView	删除一条数据	delete	GenericAPIView DestroyModelMixin
RetrieveUpdateAPIView	查询，更新一条数据	get，put，patch	GenericAPIView RetrieveModelMixin UpdateModelMixin
RetrieveUpdateDestroyAPIView	获取，更新，删除一条数据	get，put，patch，delete	GenericAPIView RetrieveModelMixin UpdateModelMixin DestroyModelMixin

• 对比以及使用(GenericAPIView+五个拓展类 VS 子类视图)

1.GenericAPIView+五个拓展类

class DepartmentListAPIView(ListModelMixin,CreateModelMixin,GenericAPIView):

    queryset = Department.objects.all()
    serializer_class = DepartmentSerializer

    def get(self,request):
        """查询多条数据"""
        return self.list(request)

    def post(self,request):
        """新增一条数据"""
        return self.create(request)

class DepartmentDetailAPIView(RetrieveModelMixin,UpdateModelMixin,DestroyModelMixin,GenericAPIView):

    queryset = Department.objects.all()
    serializer_class = DepartmentSerializer

    def get(self,request,pk):
        """查询一条数据"""
        return self.retrieve(request,pk)

    def post(self,request,pk):
        """修改部门"""
        return self.update(request,pk)

    def delete(self,request,pk):
        """删除一个部门"""
        return self.destroy(request,pk)

2.子类视图

class DepartmentListAPIView(ListAPIView,CreateAPIView):
    ”“”实现了查询多条数据和新增一条数据的功能"""
    queryset = Department.objects.all()
    serializer_class = DepartmentSerializer

class DepartmentDetailAPIView(RetrieveUpdateDestroyAPIView):
    """实现了查询一条数据、修改一条数据、删除一条数据的功能"""
    queryset = Department.objects.all()
    serializer_class = DepartmentSerializer

3.子类视图的源码分析

# Concrete view classes that provide method handlers
# by composing the mixin classes with the base view.

class CreateAPIView(mixins.CreateModelMixin,
                    GenericAPIView):
    """
    Concrete view for creating a model instance.
    """
    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)

class ListAPIView(mixins.ListModelMixin,
                  GenericAPIView):
    """
    Concrete view for listing a queryset.
    """
    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

class RetrieveAPIView(mixins.RetrieveModelMixin,
                      GenericAPIView):
    """
    Concrete view for retrieving a model instance.
    """
    def get(self, request, *args, **kwargs):
        return self.retrieve(request, *args, **kwargs)

class DestroyAPIView(mixins.DestroyModelMixin,
                     GenericAPIView):
    """
    Concrete view for deleting a model instance.
    """
    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)

class UpdateAPIView(mixins.UpdateModelMixin,
                    GenericAPIView):
    """
    Concrete view for updating a model instance.
    """
    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def patch(self, request, *args, **kwargs):
        return self.partial_update(request, *args, **kwargs)

class ListCreateAPIView(mixins.ListModelMixin,
                        mixins.CreateModelMixin,
                        GenericAPIView):
    """
    Concrete view for listing a queryset or creating a model instance.
    """
    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)

class RetrieveUpdateAPIView(mixins.RetrieveModelMixin,
                            mixins.UpdateModelMixin,
                            GenericAPIView):
    """
    Concrete view for retrieving, updating a model instance.
    """
    def get(self, request, *args, **kwargs):
        return self.retrieve(request, *args, **kwargs)

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def patch(self, request, *args, **kwargs):
        return self.partial_update(request, *args, **kwargs)

class RetrieveDestroyAPIView(mixins.RetrieveModelMixin,
                             mixins.DestroyModelMixin,
                             GenericAPIView):
    """
    Concrete view for retrieving or deleting a model instance.
    """
    def get(self, request, *args, **kwargs):
        return self.retrieve(request, *args, **kwargs)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)

class RetrieveUpdateDestroyAPIView(mixins.RetrieveModelMixin,
                                   mixins.UpdateModelMixin,
                                   mixins.DestroyModelMixin,
                                   GenericAPIView):
    """
    Concrete view for retrieving, updating or deleting a model instance.
    """
    def get(self, request, *args, **kwargs):
        return self.retrieve(request, *args, **kwargs)

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def patch(self, request, *args, **kwargs):
        return self.partial_update(request, *args, **kwargs)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)

实际上就是把(GenericAPIView+五个拓展类)的函数封装一下，return回去而已......