如何使用django-rest-framework中的序列化程序将相似数据合并到自定义字段中？

from rest_framework import serializers

class MySerializer(serializers.Serializer):
    field1 = serializers.CharField()
    field2 = serializers.CharField()
    custom_field = serializers.SerializerMethodField()

    def get_custom_field(self, obj):
        request = self.context['request']
        # 获取请求参数
        param = request.query_params.get('param')
        
        # 查询相似数据并合并到自定义字段中
        similar_data = MyModel.objects.filter(field1__icontains=param)
        custom_field_data = [data.field2 for data in similar_data]
        
        return custom_field_data

# 在视图函数或视图类中使用该序列化器类
serializer = MySerializer(instance=queryset, context={'request': request})