将额外的参数传递给Django Rest框架中的嵌套序列化程序

from rest_framework import serializers

class ChildSerializer(serializers.ModelSerializer):
    # 定义子模型的序列化器
    class Meta:
        model = ChildModel
        fields = '__all__'

class ParentSerializer(serializers.ModelSerializer):
    # 定义父模型的序列化器
    children = ChildSerializer(many=True)  # 嵌套子模型的序列化器

    def to_representation(self, instance):
        # 重写to_representation方法，可以在此处传递额外的参数给嵌套序列化程序
        representation = super().to_representation(instance)
        # 通过self.context获取传递的额外参数
        extra_param = self.context.get('extra_param')
        representation['extra_param'] = extra_param
        return representation

    class Meta:
        model = ParentModel
        fields = '__all__'

serializer = ParentSerializer(instance, context={'extra_param': '额外参数值'})