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Description: Koz's rails git-svn clone
Homepage: http://www.rubyonrails.org
Clone URL: git://github.com/eventualbuddha/koz-rails.git 
2-0-stable: Enumerable#group_by uses ActiveSupport::OrderedHash


git-svn-id: 
http://svn-commit.rubyonrails.org/rails/branches/2-0-stable@8946 
5ecf4fe2-1ee6-0310-87b1-e25e094e27de
nzkoz (author)
Thu Feb 28 20:28:51 -0800 2008
commit  a76085fdf6d29b498eed9478483fe9cf4155e63e
tree    c441b75d6e685a53df00448b0af5a6d6977687da
parent  f769bf68e13a32fa658d1da7e0bc4a6dafb53e51
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activesupport/lib/active_support/core_ext/enumerable.rb 
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@@ -15,23 +15,10 @@ module Enumerable
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   #   "2006-02-24 -> Transcript, Transcript"
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   #   "2006-02-23 -> Transcript"
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   def group_by
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-    groups = []
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-
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-    inject({}) do |grouped, element|
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-      index = yield(element)
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-
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-      if group = grouped[index]
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-        group << element
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-      else
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-        group = [element]
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-        groups << [index, group]
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-        grouped[index] = group
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-      end
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-
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+    inject ActiveSupport::OrderedHash.new do |grouped, element|
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+      (grouped[yield(element)] ||= []) << element
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       grouped
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     end
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-
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-    groups
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   end if RUBY_VERSION < '1.9'
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   # Calculates a sum from the elements. Examples:
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activesupport/test/core_ext/enumerable_test.rb 
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@@ -21,7 +21,7 @@ class EnumerableTests < Test::Unit::TestCase
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       assert group.all? { |person| person.name == name }
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     end
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-    assert_equal objects.uniq.map(&:name), grouped.map { |name, group| name }
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+    assert_equal objects.uniq.map(&:name), grouped.keys
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   end
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   def test_sums

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