[英]Django change field value in queryset
#models.py #models.py
class Product(models.Model):
price = models.DecimalField(max_digits=10, decimal_places=2, blank=True, default=0.0000)
discount = models.DecimalField(max_digits=10, decimal_places=2, blank=True, default=0.0000)
is_discount = models.BooleanField(default=False)
#views.py #views.py
def page(request):
product = Product.objects.get(pk=1)
I have main product price, sometime I need to enable discount price, so if I enabled it in "is_discount" and when I make product instance at result I need to get by product.price the value from "discount".我有主要产品价格,有时我需要启用折扣价,所以如果我在“is_discount”中启用它,当我在结果中创建产品实例时,我需要通过 product.price 从“折扣”中获取值。
I understand that I can make it with我知道我可以做到
price = product.price
if product.is_discount:
price = product.discount
but this solution is not good for me.但这个解决方案对我不利。
Consider using a calculated field ( property
):考虑使用计算字段 ( property
):
class Product(models.Model):
price = models.DecimalField(max_digits=10, decimal_places=2, blank=True, default=0.0000)
discount = models.DecimalField(max_digits=10, decimal_places=2, blank=True, default=0.0000)
is_discount = models.BooleanField(default=False)
@property
def current_price(self):
return self.discount if self.is_discount else self.price
Product.objects.get(pk=1).current_price
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