alias_method_chain preserves the original method's visibility. Closes #7854.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6441 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 14 insertions, 2 deletions

diff --git a/activesupport/lib/active_support/core_ext/module/aliasing.rb b/activesupport/lib/active_support/core_ext/module/aliasing.rb
index 81e81696d8..b36874520b 100644
--- a/activesupport/lib/active_support/core_ext/module/aliasing.rb
+++ b/activesupport/lib/active_support/core_ext/module/aliasing.rb
@@ -25,8 +25,20 @@ class Module
     # e.g. target?_without_feature is not a valid method name.
     aliased_target, punctuation = target.to_s.sub(/([?!=])$/, ''), $1
     yield(aliased_target, punctuation) if block_given?
-    alias_method "#{aliased_target}_without_#{feature}#{punctuation}", target
-    alias_method target, "#{aliased_target}_with_#{feature}#{punctuation}"
+    
+    with_method, without_method = "#{aliased_target}_with_#{feature}#{punctuation}", "#{aliased_target}_without_#{feature}#{punctuation}"
+    
+    alias_method without_method, target
+    alias_method target, with_method
+    
+    case
+      when public_method_defined?(without_method)
+        public target
+      when protected_method_defined?(without_method)
+        protected target
+      when private_method_defined?(without_method)
+        private target
+    end
   end
 
   # Allows you to make aliases for attributes, which includes