Python 每月盘点记录的Django查询集

我想在模型中显示每个月的总记录。我找到的解决方案要求我进入第二年

class Orders(models.Model):
  orderid = models.IntegerField(db_column='orderID', primary_key=True) 
  pickupdate = models.DateField(db_column='pickupDate', blank=True, null=True)  

上述查询集的结果如下所示：

Orders.objects.filter(pickupdate__year = '2006').values_list('pickupdate__month').annotate(total = Count('orderid')

使用db函数从日期字段中提取月份

这样做,

Month        | Total 
January 2007 | 1
February 2007| 2
etc


enter code here

此ORM将生成SQL查询，如下所示：

from django.db.models import Count
from django.db.models.functions import TruncMonth

Orders.objects.annotate(month=TruncMonth('pickupdate')).values('month').annotate(total=Count('orderid'))

示例

SELECT django_date_trunc('month', "sample_orders"."pickupDate") AS "month", COUNT("sample_orders"."orderID") AS "total" FROM "sample_orders" GROUP BY django_date_trunc('month', "sample_orders"."pickupDate")

[8]中的

：来自django.db.models导入计数
在[9]中：从django.db.models.functions导入TruncMonth
[10]中的Orders.objects.annotate（month=truncmount（'pickupdate'））.values（'month'）.annotate（total=Count（'orderid'））
出[10]：

SELECT django_date_trunc('month', "sample_orders"."pickupDate") AS "month", COUNT("sample_orders"."orderID") AS "total" FROM "sample_orders" GROUP BY django_date_trunc('month', "sample_orders"."pickupDate")

In [8]: from django.db.models import Count

In [9]: from django.db.models.functions import TruncMonth

In [10]: Orders.objects.annotate(month=TruncMonth('pickupdate')).values('month').annotate(total=Count('orderid'))
Out[10]: <QuerySet [{'month': datetime.date(2018, 8, 1), 'total': 2}, {'month': datetime.date(2018, 9, 1), 'total': 4}]>