如何在创建ModelSerializer后添加嵌套字段？不在班上

from rest_framework import serializers

class MyNestedSerializer(serializers.ModelSerializer):
    # 这里是你的嵌套字段定义

    class Meta:
        model = MyModel
        fields = '__all__'

class MyModelSerializer(serializers.ModelSerializer):
    nested_field = serializers.SerializerMethodField()

    def get_nested_field(self, obj):
        # 这里是你生成嵌套字段值的逻辑
        return "Nested Field Value"

    def to_representation(self, instance):
        representation = super().to_representation(instance)
        representation["nested_field"] = self.get_nested_field(instance)
        return representation