Add class to deprecate instance variables

Add ActiveSupport::Deprecation::DeprecatedInstanceVariable class to
deprecate instance variables of primitive types such as stings.

1 files changed, 14 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/deprecation.rb b/activesupport/lib/active_support/deprecation.rb
index c9f1884da3..7613652c71 100644
--- a/activesupport/lib/active_support/deprecation.rb
+++ b/activesupport/lib/active_support/deprecation.rb
@@ -175,6 +175,20 @@ module ActiveSupport
           ActiveSupport::Deprecation.warn("#{@var} is deprecated! Call #{@method}.#{called} instead of #{@var}.#{called}. Args: #{args.inspect}", callstack)
         end
     end
+
+    class DeprecatedInstanceVariable < Delegator #:nodoc:
+      def initialize(value, method)
+        super(value)
+        @method = method
+        @value = value
+      end
+
+      def __getobj__
+        ActiveSupport::Deprecation.warn("Instance variable @#{@method} is deprecated! Call instance method #{@method} instead.")
+        @value
+      end
+    end
+
   end
 end