Django中序列化器or模型单独使用

serializer = OrderSerializer(Order.objects.all(), many=True).data
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serializers.ListSerializer:-->def to_representation(self, data):
    class Meta:
        list_serializer_class = ListSerializer
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def save(self, force_insert=False, force_update=False, using=None,
         update_fields=None):
    # 执行 save(), 将数据保存进数据库
    super().save(
        force_insert=force_insert,
        force_update=force_update,
        using=using,
        update_fields=update_fields
    )
    self.the_id = self._create_the_id()

    # 再次执行 save(), 将数据更新到数据库
    # 注意这里的参数，必须设置 force_update=True,否则会创建新的数据
    super().save(
        force_insert=False,
        force_update=True,
        using=using,
        update_fields=['the_id']
    )
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class DesignInitSerializer(serializers.ModelSerializer):
	element = serializers.SerializerMethodField()


	class Meta:
		model = Design
		fields = ("id", "name", "element", "category")

	def get_element(self, instance):
		user = self.context["request"].user  # todo 报错
		details = Details.objects.filter(design=instance, category__in=(1, 2), user=user).order_by("category")
		serializer = ElementSerializer(details, many=True)
		return serializer.data
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