1 files changed, 5 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index e335ab4e07..b440f9b6ba 100755
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -398,6 +398,10 @@ module ActiveRecord
         raise NotImplementedError, "change_column is not implemented"
       end
       
+      def change_column_default(table_name, column_name, default)
+        raise NotImplementedError, "change_column_default is not implemented"
+      end
+      
       def supports_migrations?
         false
       end      
@@ -482,7 +486,7 @@ module ActiveRecord
         end
       
         def add_column_options!(sql, options)
-          sql << " DEFAULT '#{options[:default]}'" if options[:default]
+          sql << " DEFAULT '#{options[:default]}'" unless options[:default].nil?
         end
     end