Revert "Added Enumerable#pluck to wrap the common pattern of collect(&:method) *DHH*"

This reverts commit 4d20de8a50.

Conflicts:

	activesupport/CHANGELOG.md
	activesupport/lib/active_support/core_ext/enumerable.rb
	activesupport/test/core_ext/enumerable_test.rb

activesupport/CHANGELOG.md

@@ -7,8 +7,6 @@
 
 *   Add ActiveSupport::Cache::NullStore for use in development and testing. *Brian Durand*
 
-*   Added Enumerable#pluck to wrap the common pattern of collect(&:method) *DHH*
-
 *   Module#synchronize is deprecated with no replacement.  Please use `monitor`
     from ruby's standard library.
 

activesupport/lib/active_support/core_ext/enumerable.rb

@@ -26,12 +26,27 @@ module Enumerable
     end
   end
 
-  # Plucks the value of the passed method for each element and returns the result as an array. Example:
+  # Iterates over a collection, passing the current element *and* the
+  # +memo+ to the block. Handy for building up hashes or
+  # reducing collections down to one object. Examples:
   #
-  #   people.pluck(:name) # => [ "David Heinemeier Hansson", "Jamie Heinemeier Hansson" ]
-  def pluck(method)
-    collect { |element| element.send(method) }
+  #   %w(foo bar).each_with_object({}) { |str, hsh| hsh[str] = str.upcase }
+  #   # => {'foo' => 'FOO', 'bar' => 'BAR'}
+  #
+  # *Note* that you can't use immutable objects like numbers, true or false as
+  # the memo. You would think the following returns 120, but since the memo is
+  # never changed, it does not.
+  #
+  #   (1..5).each_with_object(1) { |value, memo| memo *= value } # => 1
+  #
+  def each_with_object(memo)
+    return to_enum :each_with_object, memo unless block_given?
+    each do |element|
+      yield element, memo
     end
+    memo
+  end unless [].respond_to?(:each_with_object)
+>>>>>>> parent of 4d20de8... Added Enumerable#pluck to wrap the common pattern of collect(&:method) *DHH*
 
   # Convert an enumerable to a hash. Examples:
   #

activesupport/test/core_ext/enumerable_test.rb

@@ -117,11 +117,4 @@ class EnumerableTests < Test::Unit::TestCase
     assert_equal true,  GenericEnumerable.new([ 1 ]).exclude?(2)
     assert_equal false, GenericEnumerable.new([ 1 ]).exclude?(1)
   end
-  
-  def test_pluck_single_method
-    person = Struct.new(:name)
-    people = [ person.new("David"), person.new("Jamie") ]
-    
-    assert_equal [ "David", "Jamie" ], people.pluck(:name)
-  end
 end