On Sybase DBs, the timestamp column cannot be updated with a query, the server does it automatically(SAP Software Solutions | Business Applications and Technology? id=20316). Since ActiveRecord writes all attributes back to the database on every call to #save, the transaction error. To get by I edited the default sybase_adapter to not include timestamp types when it returns the column listing, thus eliminating that attribute all together. But now if I want to read that attribute, I'm out of luck.
Has anyone else run across this issue? Is there some way I can fix the problem without modifying the sybase_adapter?