From 3ee6bcfc3d3e7be0dd3b76ac929500aaf031f8f9 Mon Sep 17 00:00:00 2001
From: Vasiliy Ermolovich <younash@gmail.com>
Date: Sat, 20 Oct 2012 22:27:43 +0300
Subject: check_box value can be not only an object of Array class

there is a chance that `value` is a Set or an object that reponses to `include?` method so let's handle this case
---
 actionpack/lib/action_view/helpers/tags/check_box.rb | 8 +++++---
 actionpack/test/template/form_helper_test.rb         | 6 ++++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/actionpack/lib/action_view/helpers/tags/check_box.rb b/actionpack/lib/action_view/helpers/tags/check_box.rb
index 9d17a1dde3..e21cc07746 100644
--- a/actionpack/lib/action_view/helpers/tags/check_box.rb
+++ b/actionpack/lib/action_view/helpers/tags/check_box.rb
@@ -46,10 +46,12 @@ module ActionView
             false
           when String
             value == @checked_value
-          when Array
-            value.include?(@checked_value)
           else
-            value.to_i == @checked_value.to_i
+            if value.respond_to?(:include?)
+              value.include?(@checked_value)
+            else
+              value.to_i == @checked_value.to_i
+            end
           end
         end
 
diff --git a/actionpack/test/template/form_helper_test.rb b/actionpack/test/template/form_helper_test.rb
index 246c4bfada..fbfc73deda 100644
--- a/actionpack/test/template/form_helper_test.rb
+++ b/actionpack/test/template/form_helper_test.rb
@@ -400,6 +400,12 @@ class FormHelperTest < ActionView::TestCase
       '<input name="post[secret]" type="hidden" value="0" /><input checked="checked" id="post_secret" name="post[secret]" type="checkbox" value="1" />',
       check_box("post", "secret")
     )
+
+    @post.secret = Set.new(['1'])
+    assert_dom_equal(
+      '<input name="post[secret]" type="hidden" value="0" /><input checked="checked" id="post_secret" name="post[secret]" type="checkbox" value="1" />',
+      check_box("post", "secret")
+    )
   end
 
   def test_check_box_with_include_hidden_false
-- 
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