假设我有2个客户和帐户模型。
模型
class Account(models.Model):
customer = models.ForeignKey(Customer,on_delete=models.CASCADE,
blank=True,null=True,related_name='account')
desc = models.CharField(max_length=100)
paid = models.IntegerField(default=0)
received = models.IntegerField(default=0)
created_at = models.DateTimeField(auto_now_add=True)
class Customer(models.Model):
name = models.CharField(max_length=30,unique=True)
contact = models.CharField(max_length=10)
我要访问模板中的收款额和付款额字段
客户视图
def show_customer(request,id=None):
customer = Customer.objects.filter(user=request.user)
return render(request,'customer/show_customer.html',{'customer':customer})
show_customer.html
<html>
{% for cust in customer %}
{{cust.name}}
{{cust.contact}}
**Here I want sum of paid & sum of receive for current customer**
</html>
您可以使用Django模型@property装饰器。
您的客户模型
class Customer(models.Model):
name = models.CharField(max_length=30,unique=True)
contact = models.CharField(max_length=10)
@property
def received_amount(self, obj):
return obj.account.all().aggregate(Sum('received'))['received__sum']
@property
def paid_amount(self, obj):
return obj.account.all().aggregate(Sum('paid'))['paid__sum']
然后您可以在模板中访问它
<html>
{% for cust in customer %}
{{cust.name}}
{{cust.contact}}
{{ cust.received_amount }}
{{ cust.paid_amount }}
</html>
希望这会帮到您！