相同的模型這裏是我的模型我如何兩場的總和與另一場關於在Django
class Wallet(models.Model):
"""
Keep track of the monetary values of a company's wallet
"""
serializer_class = WalletSocketSerializer
company = models.OneToOneField(Company, verbose_name=_('company'))
packaged_credits = models.BigIntegerField(_('packaged credits'), default=0)
purchased_credits = models.BigIntegerField(_('purchased credits'), default=0)
low_credits_threshold = models.BigIntegerField(default=0)
現在我想發送警報如果總學分低於閾值,這將是讓所有的小錢包在這SQL相當於
select * from wallets_wallet where (packaged_credits + purchased_credits) < low_credits_threshold;
我想知道如何執行,在Django的,現在我已經試過以下,它的工作原理,但我認爲它應該是以更多的Django方式完成:
low_wallets = []
for wallet in Wallet.objects.all():
if wallet.packaged_credits + wallet.purchased_credits < wallet.low_credits_threshold:
low_wallets.append(wallet)
感謝弗拉基米爾,我將與曼哈頓博士的回答去,因爲它看起來更優雅 –
毫米優雅,但我看到django文檔聲稱使用它作爲最後的手段,所以你的答案在這裏 –