在django rest框架中过滤嵌套的序列化程序

我正在使用django rest框架在django中构建一个序列化器 . 我需要过滤嵌套模型的查询集 .

我找到了How do you filter a nested serializer in Django Rest Framework?，它似乎有答案，但是当我实现它时，我的数据没有变化 . 我能看到的唯一区别是引用过滤列表序列化器的序列化器也有其他字段 .

模型（为清晰起见缩写）：

class GCUser(models.Model):
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)
    email = models.EmailField()
    is_member = models.BooleanField(default=False)
    age = models.SmallIntegerField(blank=True, null=True)
    session_key = models.CharField(max_length=100, db_index=True, blank=True, null=True)


class Connection(models.Model):
    creation_date = models.DateTimeField(auto_now_add=True)
    user = models.ForeignKey(GCUser, related_name='user_connection')
    event = models.ForeignKey(Event, related_name='event_connection')
    role = models.CharField(max_length=8, choices=constants.Roles.ROLE_CHOICES,)

class Event(Game):
    creation_date = models.DateTimeField(auto_now_add=True)
    public = models.BooleanField(default=False)
    start_time = models.DateTimeField(null=True, blank=True)
    end_time = models.DateTimeField(null=True, blank=True)
    gm_is_player = models.BooleanField(default=False,
                                       help_text='Check if GM will be playing the game',
                                       verbose_name='GM is a player')
    gm_is_designer = models.BooleanField(default=False, help_text='Check if GM designed the game')
    user_notes = models.TextField(blank=True, default='', verbose_name='Note to Scheduler')
    scheduler_notes = models.TextField(blank=True, default='')
    experience = models.CharField(max_length=3, choices=constants.ExpLevels.EXPERIENCE_CHOICES,
                                  default=constants.ExpLevels.NOVICE,)
    status = models.CharField(max_length=4, db_index=True,
                              choices=constants.Status.STATUS_CHOICES,)

这是我的代码：

class FilteredListSerializer(serializers.ListSerializer):
    def to_representation(self, data):
        data = data.filter(status=constants.Status.ASSIGNED).order_by('start_time')
        return super(FilteredListSerializer, self).to_representation(data)


class UserEventSerializer(serializers.ModelSerializer):
    class Meta:
        list_serializer_class = FilteredListSerializer
        model = models.Event
        fields = ('id', 'event_name', 'conflict_type', 'start_time', 'end_time')


class UserConnectionSerializer(serializers.ModelSerializer):
    event = UserEventSerializer()

    class Meta:
        model = models.Connection
        fields = ('get_role_display', 'conflict_type', 'event')


class GCUserSerializer(serializers.ModelSerializer):
    user_connection = UserConnectionSerializer(many=True)

    class Meta:
        model = models.GCUser
        fields = ('pk', 'first_name', 'last_name', 'email',
                  'is_member', 'age', 'user_connection')

PyCharm告诉我“类FilteredListSerializer必须实现所有抽象方法”但它实际上并没有抛出错误 . 我在列表序列化程序的第一行放了一个断点，但它没有被触发 .

我正在使用Python 3.4和django 1.7 .

在此先感谢您的帮助 .

编辑添加：查看序列化器代码，我意识到可能是关键区别：我的调用有 many=True ，而上一篇文章没有 . 我尝试取出 model= ，但正如预期的那样抛出一个错误，显然早期帖子中的"working"代码实际上并没有按照书面形式运行 .