From: Nico Ritsche <nico.ritsche@...>
Date: 2008-01-30T15:39:27+09:00
Subject: Re: Hash Sorting

Ilan Berci wrote:
> Nico Ritsche wrote:
>> Rodrigo Kochenburger wrote:
>>>> pi_array_sorted =
>>>> { 'general_event_types', �[GeneralEventType1, GeneralEventType2, ..],
>>>> � 'prices', � � � � � � � [Price1, Price2, ..],
>>>> � 'specific_event_types', [SpecificEventType1, SpecificEventType2, ..],
>>>> � 'general_event_types', �[Teacher1, Teacher2, ..] }
>>>>
> 
>> Nico
> 
> Nico,
> 
> We can help but you must strive to explain what you want clearly and 
> legibly.. For the pi_array_sorted, it appears that you want to convert a 
> hash of arrays into an array of arrays where the second arrays is 
> sorted.
> 
> Here is a solution that sorts the nested arrays and then the initial 
> array
> 
> irb(main):002:0> a = {1=>[3,7,1,7], 2=>[3,7,1,1],3=>[3,2,2,9]}
> => {1=>[3, 7, 1, 7], 2=>[3, 7, 1, 1], 3=>[3, 2, 2, 9]}
> irb(main):003:0> a.each {|b,c| c.sort!}
> => {1=>[1, 3, 7, 7], 2=>[1, 1, 3, 7], 3=>[2, 2, 3, 9]}
> irb(main):004:0> a.sort
> => [[1, [1, 3, 7, 7]], [2, [1, 1, 3, 7]], [3, [2, 2, 3, 9]]]
> 
> hth
> 
> If it doesn't then write the code EXACTLY as you have it.. and then the 
> exact output that you desire and we will code it for you.. The code that 
> you submitted is barely readable and leaves a lot open to 
> interpretation.
> 
> ilan

Hi Ilan,

actually I supplied my exact code already.

So here again, my exact code that doesn't work:

@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

So what I'm doing here is building a hash containing arrays of rails 
active record objects. So for example @parent_items['teachers'] is an 
array of Teacher records. Then I call the hashs's sort method. After 
doing this I expect pi_array_sorted to be a nested array, sorted by key, 
as the documentation of Hash.sort suggests ("Converts hsh to a nested 
array of [ key, value ] arrays and sorts it, using Array#sort."). So the 
result for the above code should be this nested array:


[ 'general_event_types',  [GeneralEventType1, GeneralEventType2, ..],
  'prices',               [Price1, Price2, ..],
  'specific_event_types', [SpecificEventType1, SpecificEventType2, ..],
  'teachers',             [Teacher1, Teacher2, ..] ]

But this is not what I get. The keys in the resulting array still have 
an arbitrary order, the exact same order as if I don't call .sort at 
all.

Nico

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