Question

我想获取列数量中所有先前值的按行求和。

models.py

class PaymentRecord(models.Model):
    invoice_no = models.ForeignKey(Invoice, unique=False, related_name='paymentrecord', on_delete=models.CASCADE)
    amount = models.CharField(max_length=10)
    paid_into = models.CharField(max_length=40, choices=PAID)
    payment_date = models.DateField(auto_now=False, auto_now_add=False)
    cheque_date = models.DateField(auto_now=False, auto_now_add=False, null=True, blank=True)
    cheque_no = models.CharField(max_length=20, null=True, blank=True)
    notes = models.CharField(max_length=100, null=True, blank=True)

我尝试了查询集

pay_receipt = PaymentRecord.objects.filter(Q(payment_date__range=[startdate, enddate]),Q(paid_into='ONLINE') | Q(paid_into='CHEQUE')).annotate(totals=Sum('amount')).order_by('payment_date')

我想要这样的结果

Id   paid_into   payment_date   amount    SumAmount
---------------------------------------------------------
1     ONLINE      12-09-2019        40.00     40.00
2     ONLINE      12-09-2019        40.00     80.00
3     ONLINE      12-09-2019        45.00     125.00         
4     ONLINE      12-09-2019        50.00     175.00

Answer 1

在Django> = 2和受支持的数据库上，您可以使用Window函数来获得累加值：

from django.db.models import Window, Sum

PaymentRecord.objects.filter(...).annotate(
    SumAmount=Window(Sum(F('amount')), order_by=F('pk').asc())
).values('id', 'paid_into', 'payment_date', 'amount', 'SumAmount')

Answer 2

您可能会通过以下方法实现您想要的：

from django.db.models import Window, Sum
PaymentRecord.objects.filter(...).annotate(
    SumAmount=Window(
        Sum(F('amount')),
        partition_by=F('paid_into'),
        order_by=F('payment_date').asc()
    )
).values('id', 'paid_into', 'payment_date', 'amount', 'SumAmount')

Answer 3

您可以尝试这只是简单的代码，希望它能起作用！

query = ModelName.objects.aggregate(Sum('field_name'))
context = {'query':query}
reutrn render(request,'your_template_name',context)

在 html文件中：

<td>{{ query}}</td>

如何使用Django queryset

3 个答案: