From 344364990436d9fcb7e77d5deb1beeb9c34a2b85 Mon Sep 17 00:00:00 2001
From: Benjamin Quorning <bquorning@zendesk.com>
Date: Tue, 6 Nov 2012 21:32:03 +0100
Subject: Set @permitted on new instance when slicing parameters hash

---
 actionpack/lib/action_controller/metal/strong_parameters.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'actionpack/lib')

diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb
index bd0bcd23ff..da640502a2 100644
--- a/actionpack/lib/action_controller/metal/strong_parameters.rb
+++ b/actionpack/lib/action_controller/metal/strong_parameters.rb
@@ -259,7 +259,9 @@ module ActionController
     #   params.slice(:a, :b) # => {"a"=>1, "b"=>2}
     #   params.slice(:d)     # => {}
     def slice(*keys)
-      self.class.new(super)
+      self.class.new(super).tap do |new_instance|
+        new_instance.instance_variable_set :@permitted, @permitted
+      end
     end
 
     # Returns an exact copy of the <tt>ActionController::Parameters</tt>
-- 
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