Question

我的发票型号：

class Invoice(models.Model):
    client = models.ForeignKey(Clients)
    invoice_number = models.CharField(max_length=100)
    invoice_status = models.ForeignKey(Status, on_delete=models.CASCADE,null=True)

状态模型：

class Status(models.Model):
    invoice_status = models.CharField(max_length=50)

客户端模型：

class Clients(models.Model):
    name = models.CharField(max_length=50)
    address = models.TextField(null=True, blank=True)
    contact_person = models.CharField(max_length=50, null=True, blank=True)

状态为

1.Draft 2.Sent 3.Paid

我尝试了多种方法，但都失败了

invoices = Invoice.objects.values("client").aggregate(Paid=Sum(Case(When(invoice_status__id=1, then=1),output_field=IntegerField())))

我想让所有客户的发票状态统计

预期结果：

client_id：1，草稿：4（计数），已发送：5（计数），已付款：0（计数）

Answer 1

from collections import OrderedDict
from pprint import pprint
from django.db.models import Count

data = Invoice.objects.prefetch_related('invoice_status') \
    .values('client', 'invoice_status') \
    .annotate(count=Count('id')) \
    .order_by('client') \
    .values_list('client', 'invoice_status__invoice_status', 'count')
user_statuses = OrderedDict()
for client, status, count in data:
    statuses = user_statuses.get(client) or {}
    statuses[status] = count
    user_statuses[client] = statuses
pprint(user_statuses)

获取具有多个状态ID的所有客户发票的计数

1 个答案: