1 files changed, 4 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
index 37e5c3859c..1458fbf496 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
@@ -15,6 +15,10 @@ module ActiveRecord
 
         @default_function = default_function
       end
+
+      def serial?
+        default_function && default_function =~ /\Anextval\(.*\)\z/
+      end
     end
   end
 end