在带有Squeel的select中使用NOW（）-UsingNOW()inaselectwithSqueel

I want to get the average of the difference between the current time and a datetime value in the database with Squeel:

我想用Squeel获取数据库中当前时间和日期时间值之间的差异的平均值：

Car.select{average(NOW() - created_at)}

Which tries to take "NOW" as a column in the database:

哪个尝试将“NOW”作为数据库中的列：

ActiveRecord::StatementInvalid: PGError: ERROR:  column cars.NOW does not exist
LINE 1: SELECT avg("cars"."NOW" - "cars"."created_at") FROM "cars"  ...

Any way to do this in Squeel?

在Squeel有什么办法吗？

1 个解决方案