Enhance Symbol#to_proc so it works with list objects, such as multi-dimensional arrays. Closes #5295 [nov@yo.rim.or.jp]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4455 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/CHANGELOG

@@ -1,5 +1,10 @@
 *SVN*
 
+* Enhance Symbol#to_proc so it works with list objects, such as multi-dimensional arrays. Closes #5295 [nov@yo.rim.or.jp].  Example:
+
+    {1 => "one", 2 => "two", 3 => "three"}.sort_by(&:first).map(&:last)
+    #=> ["one", "two", "three"]
+
 * Added Hash.create_from_xml(string) which will create a hash from a XML string and even typecast if possible [DHH]. Example:
 
     Hash.create_from_xml <<-EOT

activesupport/lib/active_support/core_ext/symbol.rb

@@ -7,6 +7,6 @@ class Symbol
   #   # The same as people.select { |p| p.manager? }.collect { |p| p.salary }
   #   people.select(&:manager?).collect(&:salary)
   def to_proc
-    Proc.new { |obj, *args| obj.send(self, *args) }
+    Proc.new { |*args| args.shift.__send__(self, *args) }
   end
 end

activesupport/test/core_ext/symbol_test.rb

@@ -4,5 +4,7 @@ require File.dirname(__FILE__) + '/../../lib/active_support/core_ext/symbol'
 class SymbolTests < Test::Unit::TestCase
   def test_to_proc
     assert_equal %w(one two three), [:one, :two, :three].map(&:to_s)
+    assert_equal(%w(one two three),
+      {1 => "one", 2 => "two", 3 => "three"}.sort_by(&:first).map(&:last))
   end
 end