commit fa86099de99da2802b24fc48ce2eb6c0c1bb315d
Author: Georg Ledermann <ledermann@gmx.de>
Date:   Tue Jul 13 11:12:42 2010 +0200

    Fixed has_many deleting for STI child class

diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index 3a32581..d8a3906 100755
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -1437,7 +1437,7 @@ module ActiveRecord
                   record,
                   reflection.name,
                   reflection.klass,
-                  reflection.dependent_conditions(record, record.class, extra_conditions))
+                  reflection.dependent_conditions(record, record.class.base_class, extra_conditions))
                 end
               when :nullify
                 before_destroy do |record|
@@ -1446,7 +1446,7 @@ module ActiveRecord
                   reflection.name,
                   reflection.klass,
                   reflection.primary_key_name,
-                  reflection.dependent_conditions(record, record.class, extra_conditions))
+                  reflection.dependent_conditions(record, record.class.base_class, extra_conditions))
                 end
               else
                 raise ArgumentError, "The :dependent option expects either :destroy, :delete_all, or :nullify (#{reflection.options[:dependent].inspect})"