From: Nico Ritsche <nico.ritsche@...>
Date: 2008-01-29T07:02:06+09:00
Subject: Re: Hash Sorting

Nico Ritsche wrote:
> Siep Korteling wrote:
>> Ilan Berci wrote:
>> 
>>> 
>>> ilan
>> 
>> irb(main):001:0> h = {1=>2,3=>4,5=>6}
>> => {5=>6, 1=>2, 3=>4}
>> irb(main):002:0> h.to_a.sort
>> => [[1, 2], [3, 4], [5, 6]]
>> irb(main):003:0> h.to_a.sort_by {|a,b| b}
>> => [[1, 2], [3, 4], [5, 6]]
>> irb(main):004:0>
>> 
>> h.to_a.sort_by {|a,b| b} #sorts by value; the OP wants to sort by key.
>> h.to_a.sort_by {|key,value| key}
>> #or just
>> h.to_a.sort_by {|key|key}
>> 
>> Regards,
>> 
>> Siep
> 
> 
> array.sort sorts by key, I know that. That's what I'm trying to do, but 
> it doesnt work in my case for some reason


maybe this excerpt of my code helps to clarify what I'm trying to do 
(for those who know rails):

@parent_items = {}

@parent_items['teachers']  = Teacher.find(:all)
@parent_items['prices']  = Price.find(:all)
@parent_items['general_event_types']  = GeneralEventType.find(:all, 
:conditions => "language_parent_id = id")
@parent_items['specific_event_types']  = SpecificEventType.find(:all, 
:conditions => "language_parent_id = id")

pi_array_sorted = @parent_items.to_a.sort

and the i like to iterate over the elements of the sorted array, so the
result should look like this:

pi_array_sorted =
{ 'general_event_types',  [GeneralEventType1, GeneralEventType2, ..],
  'prices',               [Price1, Price2, ..],
  'specific_event_types', [SpecificEventType1, SpecificEventType2, ..],
  'general_event_types',  [Teacher1, Teacher2, ..] }

So the keys should be in alphabetical order, but they arent, at least
not when I iterate over the array using

pi_array_sorted.each do |a|
..
end


-- 
Posted via http://www.ruby-forum.com/.