Temporary fix for 3-1-stable that does not implement key? on cookie jar, closes #1179

CHANGELOG.rdoc

@@ -1,3 +1,6 @@
+* bug fix
+  * Improve Rails 3.1 compatibility
+
 == 1.4.1
 
 * enhancements

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    devise (1.4.0)
+    devise (1.4.1)
       bcrypt-ruby (~> 2.1.2)
       orm_adapter (~> 0.0.3)
       warden (~> 1.0.3)
@@ -91,7 +91,7 @@ GEM
     oauth2 (0.1.1)
       faraday (~> 0.5.0)
       multi_json (~> 0.0.4)
-    orm_adapter (0.0.4)
+    orm_adapter (0.0.5)
     polyglot (0.3.1)
     rack (1.2.2)
     rack-mount (0.6.14)

lib/devise/strategies/rememberable.rb

@@ -9,14 +9,15 @@ module Devise
     class Rememberable < Authenticatable
       # A valid strategy for rememberable needs a remember token in the cookies.
       def valid?
-        cookies.key?(remember_key)
+        @remember_cookie = nil
+        remember_cookie.present?
       end
 
       # To authenticate a user we deserialize the cookie and attempt finding
       # the record in the database. If the attempt fails, we pass to another
       # strategy handle the authentication.
       def authenticate!
-        resource = mapping.to.serialize_from_cookie(*cookies.signed[remember_key])
+        resource = mapping.to.serialize_from_cookie(*remember_cookie)
 
         if validate(resource)
           success!(resource)
@@ -40,6 +41,11 @@ module Devise
       def remember_key
         "remember_#{scope}_token"
       end
+
+      def remember_cookie
+        @remember_cookie ||= cookies.signed[remember_key]
+      end
+
     end
   end
 end