Question

我正在尝试返回一个用django设置的查询，该查询返回用户进行交易的每种不同货币的购买总金额SUM（amount），支付的总价格SUM（total_price）。这可能吗？建议将不胜感激

下面的交易模型


class Transaction(models.Model):
    currency = models.CharField(max_length=20)
    amount = models.IntegerField()
    total_price = models.DecimalField(max_digits=8, decimal_places=2)
    date_purchased = models.DateTimeField()
    note = models.TextField(default="")
    owner = models.ForeignKey(User, on_delete=models.CASCADE)

下面的功能

@login_required
def portfolio(request):

    sum_amount = Sum('amount')
    sum_total_price = Sum('total_price')

    context = {
        'transactions': Transaction.objects.filter(owner=request.user).annotate(
            current_amount=sum_amount,
            purchased_amount=sum_total_price
        )
    }
    return render(request, 'webapp/portfolio.html', context, {'title': 'Portfolio'})

下面的HTML

            {% for transaction in transactions %}
            <tr>
                <td>{{transaction.current_amount}}</td>
                <td>{{transaction.purchased_amount}}</td>

            </tr>
            {% endfor %}

下面的SaleForm

class SaleForm(forms.ModelForm):

    amount_sold = forms.IntegerField()
    total_price_sold = forms.DecimalField()
    date_sold = forms.DateField(
        widget=forms.TextInput(
            attrs={'type': 'date'}
        )
    )
    note = forms.CharField(widget=forms.TextInput(attrs={'placeholder': 'Keep a Note?'}))

    class Meta:
        model = Sale
        fields = ('date_sold', 'amount_sold', 'total_price_sold', 'note')

        labels = {
            'date_sold': _('Sale Date'),
        }
        help_texts = {
            'date_sold': 'Use Calendar to enter date',
        }

Answer 1

在Django ORM中将 GROUP BY 用作

from django.db.models.aggregates import Sum

Transaction.objects.filter(owner=request.user).values('currency').annotate(
    sum_amount=Sum('amount'),
    sum_total_price=Sum('total_price'))

然后视图变为

from django.db.models.aggregates import Sum


@login_required
def portfolio(request):
    context = {
        'transactions': Transaction.objects.filter(owner=request.user).values('currency').annotate(
            sum_amount=Sum('amount'),
            sum_total_price=Sum('total_price'))
    }
    return render(request, 'webapp/portfolio.html', context, {'title': 'Portfolio'})

Answer 2

尝试一下

Transaction.objects.filter(owner=request.user).values('currency', 'owner').annotate(amount_sum=Sum('amount'), total_price_sum=Sum('total_price'))

这将返回类似这样的内容

<QuerySet [{'currency': 'BDT', 'owner': 1, 'amount_sum': 123, 'total_price_sum': Decimal('90')}, {'currency': 'USD', 'owner': 1, 'amount_sum': 11, 'total_price_sum': Decimal('30')}]>

我如何返回用户与之进行交易的每种不同货币的总和（金额）总和（总计价格）

2 个答案: