From 4c0b83d24e7af673eed0f151666031ea0b864325 Mon Sep 17 00:00:00 2001
From: Mark Dodwell <mark@mkdynamic.co.uk>
Date: Sun, 12 Sep 2010 23:23:51 -0700
Subject: [PATCH] add boolean_attr_accessor to Module core extensions

---
 .../lib/active_support/core_ext/module.rb          |    1 +
 .../core_ext/module/boolean_attr_accessor.rb       |   20 +++++++++++
 .../core_ext/module/boolean_attr_accessor_test.rb  |   34 ++++++++++++++++++++
 3 files changed, 55 insertions(+), 0 deletions(-)
 create mode 100644 activesupport/lib/active_support/core_ext/module/boolean_attr_accessor.rb
 create mode 100644 activesupport/test/core_ext/module/boolean_attr_accessor_test.rb

diff --git a/activesupport/lib/active_support/core_ext/module.rb b/activesupport/lib/active_support/core_ext/module.rb
index f59fcd1..1a4c687 100644
--- a/activesupport/lib/active_support/core_ext/module.rb
+++ b/activesupport/lib/active_support/core_ext/module.rb
@@ -5,6 +5,7 @@ require 'active_support/core_ext/module/reachable'
 require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/module/attr_internal'
 require 'active_support/core_ext/module/attr_accessor_with_default'
+require 'active_support/core_ext/module/boolean_attr_accessor'
 require 'active_support/core_ext/module/delegation'
 require 'active_support/core_ext/module/synchronization'
 require 'active_support/core_ext/module/deprecation'
diff --git a/activesupport/lib/active_support/core_ext/module/boolean_attr_accessor.rb b/activesupport/lib/active_support/core_ext/module/boolean_attr_accessor.rb
new file mode 100644
index 0000000..eb9e02d
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/module/boolean_attr_accessor.rb
@@ -0,0 +1,20 @@
+class Module
+
+  def boolean_attr_accessor(*names)
+    names.each do |name|
+      module_eval(<<-EVAL, __FILE__, __LINE__ + 1)
+        def #{name}=(v)
+          @#{name} = begin
+            v == true ||
+            v.is_a?(String) && (v == "1" || v == "true") ||
+            v.is_a?(Integer) && v == 1
+          end
+        end
+
+        attr_reader :#{name}
+        alias_method :#{name}?, :#{name}
+      EVAL
+    end
+  end
+
+end
diff --git a/activesupport/test/core_ext/module/boolean_attr_accessor_test.rb b/activesupport/test/core_ext/module/boolean_attr_accessor_test.rb
new file mode 100644
index 0000000..f72736b
--- /dev/null
+++ b/activesupport/test/core_ext/module/boolean_attr_accessor_test.rb
@@ -0,0 +1,34 @@
+require "abstract_unit"
+require "active_support/core_ext/module/boolean_attr_accessor"
+
+class BooleanAttrAccessorTest < Test::Unit::TestCase
+  def setup
+    @target = Class.new do
+      boolean_attr_accessor :foo
+    end
+    @instance = @target.new
+  end
+
+  EXAMPLES = {
+    true       => true,
+    false      => false,
+    "true"     => true,
+    "false"    => false,
+    "0"        => false,
+    "1"        => true,
+    0          => false,
+    1          => true,
+    3.142      => false,
+    Object.new => false,
+    [1,2,3]    => false,
+    "blAh!"    => false
+  }
+
+  def test_boolean_examples
+    EXAMPLES.each do |input, expected|
+      @instance.foo = input
+      assert_equal expected, @instance.foo?
+      assert_equal expected, @instance.foo
+    end
+  end
+end
-- 
1.7.1