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Django嵌套的序列化程序筛选器仅用于一个字段,而不是所有字段

django-serializer django-rest-framework django-models django

Naroju · 技术社区 · 6 年前

我有两个序列化程序如下。下面代码段的输出是Workers,并带有与所有字段相关联的票证计数器详细信息( ticket_counter , ticket_counter_name worker ). 但我只需要一个领域 售票处名称

class WorkerSerializer(serializers.ModelSerializer):

    ticket_counter = WorkerToCounterSerializer(many=True, read_only=True)

    class Meta:
        model = User
        fields = (
                  'username',
                  'ticket_counter',
                  )

class WorkerToCounterSerializer(serializers.ModelSerializer):
    ticket_counter = SerializerMethodField()
    ticket_counter_name = serializers.CharField(source='ticket_counter.ticket_counter_name')

    class Meta:
        model = WorkerToTicketCounter
        list_serializer_class = FilteredListSerializer
        fields = (
            'ticket_counter',
            'ticket_counter_name',
            'worker',
        )

    def get_ticket_counter(self, obj):
        return obj.ticket_counter.pk

class FilteredListSerializer(ListSerializer):
    def to_representation(self, data):
        data = data.filter(worker_to_ticket_counter_is_deleted=False)[:1]
        return super(FilteredListSerializer, self).to_representation(data)

上面的代码段输出了什么

{
        "username": "xxxxxxxxxxx",
        "ticket_counter": [
            {
                "ticket_counter": 7,
                "ticket_counter_name": "Entrance Counter",
                "worker": 4,

            }
        ]
 }

但我想要的是

 {
        "username": "xxxxxxxxxxx",
        "ticket_counter": "Entrance Counter"
 }

我只需要你的名字 . 就我而言,一个工人不能有两个售票处。显然,它只给出了一个 售票柜台 . 有可能吗?

编辑:使用字符串 StringRelatedField

{
    "username": "xxxxxxxxxxx",
    "ticket_counter": [
          "Entrance Counter",
          "xxxxxxxxxxxxxxxx",
          "xxxxxxxxxxxxxxxx",
          "xxxxxxxxxxxxxxxx"
    ]
}

编辑: WorkerToTicketCounter

class WorkerToTicketCounter(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    ticket_counter = models.ForeignKey(TicketCounter, related_name="workers")
    worker = models.ForeignKey(User, related_name='ticket_counter')
    worker_to_ticket_counter_is_deleted = models.BooleanField(default=False)

2 回复 | 直到 6 年前

JPG 6 年前

序列化方法字段 两者兼而有之过滤和 字符串表示

class WorkerSerializer(serializers.ModelSerializer):
    ticket_counter = serializers.SerializerMethodField(read_only=True)

    def get_ticket_counter(self, user):
        qs = user.ticket_counter.filter(worker_to_ticket_counter_is_deleted=False)
        if qs.exists() and hasattr(qs.first().ticket_counter, 'ticket_counter_name'):
            return qs.first().ticket_counter.ticket_counter_name
        return None

    class Meta:
        model = User
        fields = ('username', 'ticket_counter',)

neverwalkaloner 6 年前

你可以用 StringRelatedField :

class WorkerSerializer(serializers.ModelSerializer):

    ticket_counter = StringRelatedField(many=True, read_only=True)

    class Meta:
        model = User
        fields = (
                  'username',
                  'ticket_counter',
                  )

字符串相关字段 __str__ WorkerToTicketCounter 型号:

class WorkerToTicketCounter:
    ...
    def __str__(self):
        return self.ticket_counter.ticket_counter_name