class ListModelMixin(object):

    """

    List a queryset.

    """

    def list(self, request, *args, **kwargs):

        queryset = self.filter_queryset(self.get_queryset())  # 对获取ORM集合进行过滤

        page = self.paginate_queryset(queryset)  # 对过滤好的数据进行分页

        if page is not None:

            serializer = self.get_serializer(page, many=True)   # 获取序列化器, 对分页好的数据进行序列化

            return self.get_paginated_response(serializer.data) # 直接返回Response对象

        serializer = self.get_serializer(queryset, many=True)

        return Response(serializer.data)

    def get_serializer(self, *args, **kwargs):

        """

        Return the serializer instance that should be used for validating and

        deserializing input, and for serializing output.

        """

        serializer_class = self.get_serializer_class()

        kwargs['context'] = self.get_serializer_context()   # 获取参数集合, 封装参数到kwargs的context中

        return serializer_class(*args, **kwargs)    # 将kwargs封装到序列化器对象中

    def get_serializer_context(self):

        """

        Extra context provided to the serializer class.

        """

        return {

            'request': self.request,

            'format': self.format_kwarg,

            'view': self

        }