collectiveidea/delayed_job — pull request #709 by garethrees (2014-09-23 12:06:42+00:00)
Title: Pluck emails instead of find/collect

> Use pluck as a shortcut to select one or more attributes without
> loading a bunch of records just to grab the attributes you want.
>
> – http://api.rubyonrails.org/classes/ActiveRecord/Calculations.html#method-i-pluck

Use `pluck` so that copy and pasted examples are faster.