From: Brian Candler <b.candler@...>
Date: 2010-04-03T16:32:58+09:00
Subject: Re: hash key with multiple values

Lucky Nl wrote:

> puts @results
> [{x=>"i8"}, {y=>"i58"}, {y=>"i6"}, {y=>"v5"}, {z=>"ci5"}, {z=>"i63"},
> {w=>"cie201"}]
> [/code]
> from this @results hash  ,i want to get new hash like below
> 
> [code]
> puts @conver_results
> [{x=>"i8"}, {y=>"i58","i6","v5"}, {z=>"ci5","i63"},  {w=>"cie201"}]
> [/code]

Note that {z=>"ci5","i63"} is not valid hash syntax. But you can have
  {"z"=>["ci5","i63"]}

@conver_results = Hash.new { |h,k| h[k] = [] }
@results.each { |h| h.each { |k,v| @conver_results[k] << v } }

The first line makes a Hash whose elements are automatically an empty 
array if not already created. The second iterates over your original 
hashes and adds to the values array for each key.

Another way:

@conver_results = {}
@results.heac { |h| h.each { |k,v|
  @conver_results[k] ||= []
  @conver_results[k] << v
} }

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