Robert Klemme
2/9/2009 4:50:00 PM
2009/2/9 Taylor Strait <taylorstrait@gmail.com>:
> 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
First of all, I believe you want #concat and not #<<:
irb(main):003:0> a = []
=> []
irb(main):004:0> a << [1,2,3]
=> [[1, 2, 3]]
irb(main):005:0> a << [6,7,8]
=> [[1, 2, 3], [6, 7, 8]]
irb(main):006:0> a
=> [[1, 2, 3], [6, 7, 8]]
irb(main):007:0> a = []
=> []
irb(main):008:0> a.concat [1,2,3]
=> [1, 2, 3]
irb(main):009:0> a.concat [6,7,8]
=> [1, 2, 3, 6, 7, 8]
irb(main):010:0> a
=> [1, 2, 3, 6, 7, 8]
> 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?
arr.sort_by {|x| x.activated_at || x.created_at}
Kind regards
robert
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