我正在使用Django Filters软件包。
我在视图中以下列方式定义我的过滤器
class UnitFilter(django_filters.FilterSet):
class Meta:
model = Unit
fields = [
'floor', 'number', 'building','lease','leaseterm',
'lease__is_active','lease__is_terminated','lease__is_renewed',]
我过滤的我的单位模型是
class Unit(CommonInfo):
version = IntegerVersionField( )
number = models.CharField(max_length=30,null=True, blank=True)
max_occupants = models.PositiveSmallIntegerField()
floor = models.PositiveSmallIntegerField()
rooms = models.PositiveSmallIntegerField()
is_disabled_access = models.BooleanField(default=False)
balcony_quantity = models.PositiveSmallIntegerField()
building = models.ForeignKey(Building)
recomended_price = models.DecimalField(max_digits=7, decimal_places=2)
_lease = None
_leaseterm = None
#check = models.ManyToManyField(UnitCheck, through='UnitChecklist')
def _get_total(self):
from conditions.models import LeaseTerm
from lease.models import Lease
lease_dict = Lease.objects.filter(unit_id=self.id, is_active = True , is_terminated = False).aggregate(Max('id'))
if lease_dict['id__max']:
lease = lease_dict['id__max']
else:
lease = 0
leaseterm_dict = LeaseTerm.objects.filter(lease_id=lease, is_active = True , is_terminated = False).aggregate(Max('id'))
if leaseterm_dict['id__max']:
leaseterm = leaseterm_dict['id__max']
else:
leaseterm = 0
self._lease = lease
self._leaseterm = leaseterm
@property
def lease(self):
if self._lease is None:
self._get_total()
return self._lease
@property
def leaseterm(self):
if self._leaseterm is None:
self._get_total()
return self._leaseterm
此模型中有2个计算属性 租赁和租赁期
当leaseterm给我这个错误时,lease属性没有问题
Meta.fields包含未在此FilterSet上定义的字段: leaseterm
为什么呢?它是django-filter中的一个错误?有什么解决方法吗?
答案 0 :(得分:7)
有关详细说明,请参阅this。
当您执行queryset.filter(field_name=field_value)
时,Django会将其转换为SQL查询。遗憾的是,计算出的属性仅存在于Python对象上,因此您无法通过它们进行过滤。
解决方法是,每当您按其中一个进行过滤时,请在查询集中包含一个注释,该注释会在SQL中添加适当的字段。该链接有一个很好的例子,说明如何做到这一点。它比在Python中更难,但唯一的方法就是去。