From: Josselin <josselin@...>
Date: 2007-06-29T06:20:01+09:00
Subject: Re: Dynamic sort_by criteria, making it DRY...

On 2007-06-28 13:58:47 +0200, Robert Klemme <shortcutter@googlemail.com> said:

> On 28.06.2007 13:41, Josselin wrote:
>> I am presently using a sort_by on my array
>> 
>> =>    buddies = user_buddies.sort_by {|item| item.last_seen_at}
>> 
>> I would like to be able to do the same , based on a variable    
>> @criteria   set to the item key to be used
>> 
>> @criteria = 'last_seen_at'   @criteria = 'display_name' ......
>> 
>> =>   buddies = user_buddies.sort_by {|item| item.<@criteria> }
>> 
>> what could be the best way to do it ?
>> 
>> Depending upon another variable @reverse_order = true or false, I would 
>> like to perform or not teh reverse! action
>> 
>> => buddies = user_buddies.sort_by {|item| item.last_seen_at}.reverse!
>> 
>> I believe it should be
>> 
>> => buddies =  @reverse_order ? user_buddies.sort_by {|item| 
>> item.<@criteria> } : user_buddies.sort_by {|item| item.<@criteria> 
>> }.reverse!
>> 
>> thanks for your enlightment !
> 
> buddies = user_buddies.sort_by {|it| it.send @criteria}
> buddies.reverse! if @reverse_order
> 
> Kind regards
> 
> 	robert

Thanks Robert cannot be dryest....  I am so ashame of my solution that 
I don't want to publish my code...