Django嵌套序列化程序筛选器仅用于一个字段,而不是所有字段
我有两个序列化程序,如下所示。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(Django嵌套序列化程序筛选器仅用于一个字段,而不是所有字段,django,django-models,django-rest-framework,django-serializer,Django,Django Models,Django Rest Framework,Django Serializer,我有两个序列化程序,如下所示。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\u Counter,Ticket\u Counter\u name,worker)。但我只需要一个字段,它是票务\柜台\名称 class WorkerSerializer(serializers.ModelSerializer): ticket_counter = WorkerToCounterSerializer(many=True, read_only=True
Ticket\u Counter
,Ticket\u Counter\u name
,worker
)。但我只需要一个字段,它是票务\柜台\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"
}
我只需要售票柜台的名称
。就我而言,一个工人不能有两个售票柜台。显然,它只提供一个票务计数器。可能吗
编辑:使用字符串StringRelatedField
{
"username": "xxxxxxxxxxx",
"ticket_counter": [
"Entrance Counter",
"xxxxxxxxxxxxxxxx",
"xxxxxxxxxxxxxxxx",
"xxxxxxxxxxxxxxxx"
]
}
编辑:WorkerToTicketCounter
Model
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)
您可以使用:
注意:要使用StringRelatedField
,您应该将\uuu str\uuu
方法添加到您的WorkerToTicketCounter
模型中:
class WorkerToTicketCounter:
...
def __str__(self):
return self.ticket_counter.ticket_counter_name
如果我理解正确,您只需要一个序列化方法字段即可执行过滤和字符串表示
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',)
类WorkerSerializer(serializers.ModelSerializer):
票证计数器=序列化程序。SerializerMethodField(只读=真)
def get_票证计数器(自身、用户):
qs=用户.票证\计数器.过滤器(工作人员\到\票证\计数器\已删除=错误)
如果qs.exists()和hasattr(qs.first().ticket\u counter,“ticket\u counter\u name”):
返回qs.first().ticket\u counter.ticket\u counter\u name
一无所获
类元:
模型=用户
字段=('username','ticket\u counter',)
是\uuuuuunicode\uuuuuu
还是\uuuuuu str\uuuuu
?但是,它是数组中WorkerToTicketCounter
的每个实例的结果字符串。我已使用结果进行了编辑。我使用WorkerToCounterSerializer
的原因是我可以在FilteredListSerializer
中将它们筛选到一个实例。但是我只需要一个字段。你能添加WorkerToTicketCounter
模型吗?你能添加你在下面的回答中提到的过滤器的想法吗?我说的是FilteredListSerializer
来过滤worker\u to\u ticket\u counter\u is\u deleted=False
。我已经添加了它,这意味着您需要显示WorkerToTicketCounter
实例,其中包含worker\u to\u ticket\u counter\u is\u deleted=False
。。。对吧?是的。只有一个WorkerToTicketCounter
的实例会出现。如果工作人员\u到\u票证\u计数器\u被删除=错误
。我能做到。我在问题中已经提到了。但我只需要票务柜台\姓名
。不是所有的ticket\u counter。ticket\u counter\u name
这是访问父模型字段ticket\u counter\u name
的一种方式吗?是的。这都是关于你能看看这个问题吗
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',)