Ruby 1.9.2: Object#id is gone now

1 files changed, 1 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/attribute_methods/read.rb b/activerecord/lib/active_record/attribute_methods/read.rb
index 0b7d6d9094..3da3d9d8cc 100644
--- a/activerecord/lib/active_record/attribute_methods/read.rb
+++ b/activerecord/lib/active_record/attribute_methods/read.rb
@@ -12,7 +12,7 @@ module ActiveRecord
         self.attribute_types_cached_by_default = ATTRIBUTE_TYPES_CACHED_BY_DEFAULT
 
         # Undefine id so it can be used as an attribute name
-        undef_method :id
+        undef_method(:id) if method_defined?(:id)
       end
 
       module ClassMethods