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@@ -1,5 +1,7 @@
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 *SVN*
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+* Adding Hash#without Closes #7369 [eventualbuddha]
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+
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 * TimeWithZone#method_missing: send to utc to advance with dst correctness, otherwise send to time. Adding tests for time calculations methods [Geoff Buesing]
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 * Add config.active_support.use_standard_json_time_format setting so that Times and Dates export to ISO 8601 dates.  [rick]

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@@ -11,6 +11,11 @@ module ActiveSupport #:nodoc:
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       #   end
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       #
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       #   search(options.slice(:mass, :velocity, :time))
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+      #
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+      # Also allows leaving out certain keys. This is useful when duplicating
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+      # a hash but omitting a certain subset:
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+      #
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+      #   Event.new(event.attributes.without(:id, :user_id))
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       module Slice
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         # Returns a new hash with only the given keys.
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         def slice(*keys)
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@@ -22,6 +27,17 @@ module ActiveSupport #:nodoc:
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         def slice!(*keys)
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           replace(slice(*keys))
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         end
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+
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+        # Returns a new hash without the given keys.
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+        def without(*keys)
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+          allowed = self.keys - (respond_to?(:convert_key) ? keys.map { |key| convert_key(key) } : keys)
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+          slice(*allowed)
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+        end
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+
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+        # Replaces the hash without the given keys.
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+        def without!(*keys)
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+          replace(without(*keys))
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+        end
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       end
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     end
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   end

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@@ -310,6 +310,38 @@ class HashExtTest < Test::Unit::TestCase
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     assert_equal expected, original.except!(:c)
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     assert_equal expected, original
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   end
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+
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+  def test_without
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+    original = { :a => 'x', :b => 'y', :c => 10 }
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+    expected = { :a => 'x' }
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+
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+    # Should return a hash without the given keys.
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+    assert_equal expected, original.without(:b, :c)
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+    assert_not_equal expected, original
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+
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+    # Should ignore non-existant keys.
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+    assert_equal expected, original.without(:b, :c, :d)
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+
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+    # Should replace the hash with the given keys taken away.
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+    assert_equal expected, original.without!(:b, :c)
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+    assert_equal expected, original
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+  end
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+
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+  def test_indifferent_without
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+    original = { :a => 'x', :b => 'y', :c => 10 }.with_indifferent_access
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+    expected = { :c => 10 }.with_indifferent_access
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+
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+    [['a', 'b'], [:a, :b]].each do |keys|
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+      # Should return a new hash without the given keys.
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+      assert_equal expected, original.without(*keys), keys.inspect
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+      assert_not_equal expected, original
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+
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+      # Should replace the hash without the given keys.
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+      copy = original.dup
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+      assert_equal expected, copy.without!(*keys)
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+      assert_equal expected, copy
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+    end
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+  end
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 end
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 class IWriteMyOwnXML