Rails: ActiveRecord custom average calculation

Question

Outside of using a raw SQL query, is there a nice way to divide an active record query result by a constant? A variable?

Example:

Phones.group(:year).order(:year).average(:talk_time_min)

If I wanted to retrieve the talk_time_min in seconds, how could I do talk_time_min / 60?

Answer 1

Like this:

Phones.group(:year).order(:year).average('talk_time_min/60')