From 69a6381048b2bbf97ee651afebf43d9095ec9075 Mon Sep 17 00:00:00 2001
From: Damien Mathieu <42@dmathieu.com>
Date: Fri, 6 Jan 2012 17:14:49 +0100
Subject: don't set the hidden checkbox value if it's nil

---
 actionpack/lib/action_view/helpers/form_helper.rb | 2 +-
 actionpack/test/template/form_helper_test.rb      | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index 08c7fbc281..fdddb33c31 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -1091,7 +1091,7 @@ module ActionView
         else
           add_default_name_and_id(options)
         end
-        hidden = tag("input", "name" => options["name"], "type" => "hidden", "value" => unchecked_value, "disabled" => options["disabled"])
+        hidden = unchecked_value ? tag("input", "name" => options["name"], "type" => "hidden", "value" => unchecked_value, "disabled" => options["disabled"]) : ""
         checkbox = tag("input", options)
         hidden + checkbox
       end
diff --git a/actionpack/test/template/form_helper_test.rb b/actionpack/test/template/form_helper_test.rb
index 942be67d02..ad0cc41d69 100644
--- a/actionpack/test/template/form_helper_test.rb
+++ b/actionpack/test/template/form_helper_test.rb
@@ -374,6 +374,14 @@ class FormHelperTest < ActionView::TestCase
     )
   end
 
+  def test_check_box_with_nil_unchecked_value
+    @post.secret = "on"
+    assert_dom_equal(
+      '<input checked="checked" id="post_secret" name="post[secret]" type="checkbox" value="on" />',
+      check_box("post", "secret", {}, "on", nil)
+    )
+  end
+
   def test_check_box_with_multiple_behavior
     @post.comment_ids = [2,3]
     assert_dom_equal(
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