Slick (http://slick.typesafe.com/) seems to support this as well in a type-safe ...

Nullabillity on May 2, 2014 | parent | context | favorite | on: SQLAlchemy vs Other ORMs

Slick (http://slick.typesafe.com/) seems to support this as well in a type-safe manner, but personally I'm not too keen on having the compilation depend on having a stateful database available.