我有一个类交易:
class Transaction(models.Model):
Driver = models.ForeignKey(User,related_name='Driver')
Passenger = models.ForeignKey(User,related_name='Passenger')
DriverRoute = models.ForeignKey(ServiceProviderRouteDetails)
PassengerRoute = models.ForeignKey(PassengerRouteDetails)
Status = models.CharField(max_length=20)
然后我有一个类 TransactionHistory :
class TransactionHistory(models.Model):
Transaction = models.ForeignKey(Transcation)
User = models.ForeignKey(User)
Debit = models.FloatField(null='true')
Credit = models.FloatField(null='true')
Status = models.CharField(max_length=25)
DateOfPayment = models.DateTimeField(default=now)
Transaction History 具有 Transaction 列作为指向 Transaction 表的外键。我的问题是我想为登录用户计算每个司机路线的借方总和。一个 DriverRoute 的事务表可以有不止一行。
我想做这样的事情:
TranscationHistory.objects.values('Transcation.DriverRoute.id').filter(User_id=request.user.id,Status='Completed').annotate(sum_score=Sum('Credit'))
但它不工作......任何猜测?