我想通过循环对象字段来更新它们的值,但我不太确定如何做到这一点
class FinancePending(models.Model):
invoiceNumber = models.IntegerField
amountPaid = models.CharField(max_length=20)
AmountPending = models.IntegerField( blank=True, null=True)
TotalAmount = models.CharField(max_length=50, default=0)
现在我想计算函数中的amountpending。但它不起作用
amount_paid = FinancePending.objects.values_list('amountPaid', flat=True)
amount_paid = list(amount_paid)
total_amount = FinancePending.objects.values_list('TotalAmount', flat=True)
total_amount = list(total_amount)
# total - paid
TotalFee = [float(s.replace(',', '')) for s in total_amount]
AmountPaid = [float(s.replace(',', '')) for s in amount_paid]
finance_pending = FinancePending.objects.all()
i = 0
while i < len(TotalFee):
amount_pending = TotalFee[i] - AmountPaid[i]
FinancePending.objects.filter(invoiceNumber=i).values(AmountPending=amount_pending)
setattr(finance_pending, 'AmountPending', str(amount_pending))
i = 1 + i
建议使用Query Expression,更强大、更健壮
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