From 29383c2fe512bc807f5f0a018001d21fa8b28dd0 Mon Sep 17 00:00:00 2001
From: John Reitano <john_reitano@yahoo.com>
Date: Fri, 21 Jan 2011 06:52:37 -0800
Subject: [PATCH] add Object#in?

---
 .../lib/active_support/core_ext/object.rb          |    1 +
 .../lib/active_support/core_ext/object/in.rb       |   27 ++++++++++++++++++++
 activesupport/test/core_ext/object/in_test.rb      |   20 ++++++++++++++
 3 files changed, 48 insertions(+), 0 deletions(-)
 create mode 100644 activesupport/lib/active_support/core_ext/object/in.rb
 create mode 100644 activesupport/test/core_ext/object/in_test.rb

diff --git a/activesupport/lib/active_support/core_ext/object.rb b/activesupport/lib/active_support/core_ext/object.rb
index 790a26f..a76815f 100644
--- a/activesupport/lib/active_support/core_ext/object.rb
+++ b/activesupport/lib/active_support/core_ext/object.rb
@@ -2,6 +2,7 @@ require 'active_support/core_ext/object/acts_like'
 require 'active_support/core_ext/object/blank'
 require 'active_support/core_ext/object/duplicable'
 require 'active_support/core_ext/object/try'
+require 'active_support/core_ext/object/in'
 
 require 'active_support/core_ext/object/conversions'
 require 'active_support/core_ext/object/instance_variables'
diff --git a/activesupport/lib/active_support/core_ext/object/in.rb b/activesupport/lib/active_support/core_ext/object/in.rb
new file mode 100644
index 0000000..fb5b7c0
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/object/in.rb
@@ -0,0 +1,27 @@
+class Object
+  # This method tells you whether self is one of the method arguments.
+  #
+  # This simplifies:
+  #
+  #   [1,2,3].include?(x)
+  #
+  # ...to:
+  #
+  #    x.in?(1,2,3)
+  #
+  #....or:
+  #
+  #    my_array = [1,2,3]
+  #    x.in?(*my_array)
+  #
+  # which is a bit easier to read and write (at least in English)
+  #
+  def in?(*args)
+    args.include?(self)
+  end
+
+  def not_in?(*args)
+    !in?(*args)
+  end
+end
+
diff --git a/activesupport/test/core_ext/object/in_test.rb b/activesupport/test/core_ext/object/in_test.rb
new file mode 100644
index 0000000..f34d6c4
--- /dev/null
+++ b/activesupport/test/core_ext/object/in_test.rb
@@ -0,0 +1,20 @@
+require 'active_support/core_ext/object/in'
+
+class ArrayInTests < Test::Unit::TestCase
+  def test_in?
+    assert_equal 3.in?(), false
+    assert_equal 3.in?(3), true
+    assert_equal 3.in?(4), false
+    assert_equal 3.in?(1,3), true
+    assert_equal 3.in?(1,4), false
+  end
+
+  def test_not_in?
+    assert_equal 3.not_in?(), true
+    assert_equal 3.not_in?(3), false
+    assert_equal 3.not_in?(4), true
+    assert_equal 3.not_in?(1,3), false
+    assert_equal 3.not_in?(1,4), true
+  end
+end
+
-- 
1.7.3.5