From: Taylor Strait <taylorstrait@...>
Date: 2009-02-10T00:23:43+09:00
Subject: sort_by different variables?

I have a user control panel that generates an event log by merging
various things that can happen on the site. These are:

user joins
user receives invitation
user completes invitation
user refers someone
user referee activates account

So I want to merge these events into a single array and sort them. It
works well sorting by created_at. However, I do not have unique classes
for all of the events I want to merge (yeah, REST would have worked well
here).  So when I populate the array I do this:

      # create array of all events for the log
      @events = []
      @events << @user.invitations
      @events << @user.pending_referrals
      @events << @user.active_referrals
      @events = @events.flatten!.sort_by {|x| x.created_at }.reverse

A pending_referral and active_referral are the same object,but pending
has an activated_at = nil and an active_referral has activated_at =
datetime.  So, it is possible to sort this array by created_at OR
activated_at?
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