如何将django模型对象的嵌套序列化列表定制为键/值对？

from django.core.serializers import Serializer

class CustomSerializer(Serializer):
    def to_representation(self, instance):
        ret = {}
        for field in instance._meta.fields:
            field_name = field.name
            field_value = getattr(instance, field_name)
            ret[field_name] = field_value

        for related_field in instance._meta.related_objects:
            related_name = related_field.get_accessor_name()
            related_value = getattr(instance, related_name)
            if related_value:
                ret[related_name] = self.to_representation(related_value)

        return ret

from myapp.models import MyModel
from myapp.serializers import CustomSerializer

# 获取模型对象
my_model = MyModel.objects.get(pk=1)

# 创建自定义序列化器对象
serializer = CustomSerializer()

# 序列化模型对象为键/值对
data = serializer.serialize([my_model])

# 打印序列化结果
print(data)