From f62a7267c551d216297bec9f0496738b8e27dcae Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Tue, 30 Nov 2010 11:06:09 -0800
Subject: adding deprecated support for walking ancestor trees

---
 lib/arel/visitors/visitor.rb | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'lib/arel/visitors/visitor.rb')

diff --git a/lib/arel/visitors/visitor.rb b/lib/arel/visitors/visitor.rb
index 510d50399b..b0d16ffe4e 100644
--- a/lib/arel/visitors/visitor.rb
+++ b/lib/arel/visitors/visitor.rb
@@ -13,6 +13,13 @@ module Arel
 
       def visit object
         send DISPATCH[object.class], object
+      rescue NoMethodError
+        warn "visiting #{object.class} via superclass, this will be removed in arel 2.2.0" if $VERBOSE
+        superklass = object.class.ancestors.find { |klass|
+          respond_to?(DISPATCH[klass], true)
+        }
+        DISPATCH[object.class] = DISPATCH[superklass]
+        retry
       end
     end
   end
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