From: Tom Pollard <tomp@...>
Date: 2006-12-22T01:09:59+09:00
Subject: Re: Tree view hierarchy


On Dec 21, 2006, at 9:44 AM, Patrick Spence wrote:
> What I need [is] an array that contains something like this:
>
> [
>   ["Smoking|Survey & Feedback"]
>   ["Depression|Survey & Feedback"]
>   ["Stress Management|Survey & Feedback"]
>   ["Weight Management|Exercise|Survey & Feedback"],
>   ["Weight Management|Healthy Eating|Survey & Feedback"],
>   ["Weight Management|Managing Emotions|Survey & Feedback"]
> ]

First, if I was faced with this, I'd create a real tree structure, as  
Bira showed you, and generate the above list from that.  If you need  
to do anything more than this example, or if there could be multiple  
levels of parent nodes, then a real tree would be much easier to use.

On the other hand, if you really just need that result, and the  
structure of your menu isn't ever going to have more than one parent  
level, you could also do something like the following:

nodes = [
     [ 1, "Smoking",           "root"   ],
...
     [13, "Survey & Feedback", "leaf"   ]
   ]

root = []
parent = []
leaves = []
nodes.each do |node|
   idx, title, type = *node
   case type
   when 'root'
     root = [ title ]
     parent = []
   when 'parent'
     parent = [ title ]
   when 'leaf'
     leaves << (root + parent + [title]).join('|')
   end
end

At the end, 'leaves' will hold the list you wanted.

Cheers,

TomP