使用包含 defer 的查询集在 django 中序列化
我有一个小问题，那就是如何使用 defer 序列化 django 查询？ 我有这个模型：
class Evento(models.Model):
nome=models.CharField(max_length=100)
descricao=models.CharField(max_length=200,null=True)
data_inicio= models.DateTimeField()
data_fim= models.DateTimeField()
preco=models.DecimalField(max_digits=6,decimal_places=2)
consumiveis= models.CharField(max_length=5)
dress_code= models.CharField(max_length=6)
guest_list=models.CharField(max_length=15)
local = models.ForeignKey(Local)
user= models.ManyToManyField(User,null=True,blank=True)
def __unicode__(self):
return unicode('%s %s'%(self.nome,self.descricao))
我的查询是这样的：
eventos_totais = Evento.objects.defer("user").filter(data_inicio__gte=default_inicio,
data_fim__lte=default_fim)
我认为它工作得很好（我如何检查查询是否确实延迟了字段用户？）但是当我这样做时：
json_serializer = serializers.get_serializer("json")()
eventos_totais = json_serializer.serialize(eventos_totais,
ensure_ascii=False,
use_natural_keys=True)
它总是遵循用户和本地的自然键，我需要自然由于本地字段，此查询的键。但我不需要现场用户。
i have i little problem, and that is how can serialize a django query with defer ?
I have this model :
class Evento(models.Model):
nome=models.CharField(max_length=100)
descricao=models.CharField(max_length=200,null=True)
data_inicio= models.DateTimeField()
data_fim= models.DateTimeField()
preco=models.DecimalField(max_digits=6,decimal_places=2)
consumiveis= models.CharField(max_length=5)
dress_code= models.CharField(max_length=6)
guest_list=models.CharField(max_length=15)
local = models.ForeignKey(Local)
user= models.ManyToManyField(User,null=True,blank=True)
def __unicode__(self):
return unicode('%s %s'%(self.nome,self.descricao))
my query is this :
eventos_totais = Evento.objects.defer("user").filter(data_inicio__gte=default_inicio,
data_fim__lte=default_fim)
it works fine i think (how can i check if the query has realy defer the field user ? ) but when i do:
json_serializer = serializers.get_serializer("json")()
eventos_totais = json_serializer.serialize(eventos_totais,
ensure_ascii=False,
use_natural_keys=True)
it always folow the natural keys for user and local, i need natural keys for this query because of the fields local. But i do not need the field user.
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要序列化模型字段的子集，您需要为serializers.serialize()指定fields参数
from django.core import serializers data = serializers.serialize('xml', SomeModel.objects.all(), fields=('name','size'))参考：Django 文档
To serialize a subset of your models fields, you need to specify the fields argument to the serializers.serialize()
from django.core import serializers data = serializers.serialize('xml', SomeModel.objects.all(), fields=('name','size'))Ref: Django Docs