在django中加入一列的總和

Question

我試圖用django orm模型運行這個sql查詢，需要一些幫助。

SELECT SUM(CAPITAL) AS PRODUCT_CAPITAL, PRODUCT FROM CAPITAL_SHEET 
WHERE CLIENT_ID = 'X1234' 
GROUP BY PRODUCT 

我這樣做

CapitalSheet.objects.filter(client_id="X1234").values("product").annotate(Sum("capital")) 

這是我得到在JSON結果：

[ 
    { 
     "product": "product1" 
    }, 
    { 
     "product": "product2" 
    } 
] 

我期待這是輸出：

[ 
    { 
     "product": "product1", 
     "capital": 1234.00 
    }, 
    { 
     "product": "product2", 
     "capital": 1234.00 
    } 
] 

這裏是我的看法：

class CapitalListView(ListAPIView): 
    serializer_class = CapitalSheetSerializer 

    def get_queryset(self): 
     return CapitalSheet.objects.filter(client_id="X1234").values("product").annotate(Sum("capital")) 

這裏是我的模型：

class CapitalSheet(models.Model): 
    log_id = models.AutoField(db_column='LOG_ID', primary_key=True) 
    client_id = models.CharField(db_column='CLIENT_ID', max_length=25) 
    capital = models.DecimalField(db_column='CAPITAL', max_digits=10, decimal_places=2, blank=True, null=True) 
    payout_booked_profit = models.DecimalField(db_column='PAYOUT_BOOKED_PROFIT', max_digits=10, decimal_places=2, blank=True, null=True) 
    voucher_number = models.CharField(db_column='VOUCHER_NUMBER', max_length=45, blank=True, null=True) 
    ledger_date = models.DateField(db_column='LEDGER_DATE', blank=True, null=True) 
    amount = models.DecimalField(db_column='AMOUNT', max_digits=10, decimal_places=2, blank=True, null=True) 
    product = models.CharField(db_column='PRODUCT', max_length=45, blank=True, null=True) 
    transaction_type = models.CharField(db_column='TRANSACTION_TYPE', max_length=45, blank=True, null=True) 
    sebi_payin_flag = models.IntegerField(db_column='SEBI_PAYIN_FLAG', blank=True, null=True) 
    dividend_payout_flag = models.IntegerField(db_column='DIVIDEND_PAYOUT_FLAG', blank=True, null=True) 

我的串行：

class CapitalSheetSerializer(serializers.ModelSerializer): 

    class Meta: 
     model = CapitalSheet 
     fields = ['capital','product'] 

我到底錯在這裏做什麼？

Answer 1

嘗試，爲註釋列添加名稱：

CapitalSheet.objects.filter(
    client_id="X1234" 
).values("product").annotate(capital=Sum("capital")) 
#       ^^^^^^^