将两个模型实例合并为一个序列化对象django rest框架

from rest_framework import serializers

class Model1Serializer(serializers.ModelSerializer):
    class Meta:
        model = Model1
        fields = '__all__'

class Model2Serializer(serializers.ModelSerializer):
    class Meta:
        model = Model2
        fields = '__all__'

class MergedSerializer(serializers.Serializer):
    model1 = Model1Serializer()
    model2 = Model2Serializer()

    def to_representation(self, instance):
        data = super().to_representation(instance)
        merged_data = {
            'model1': data['model1'],
            'model2': data['model2']
        }
        return merged_data