Rename Relation.{base_name=>dataset}
Rename Relation.{base_name=>dataset}

See rom-rb/rom@be5cdf591b36f0779c7a9d106b2b9a9dfcfd74ef

cflipse/rom-sql,kwando/rom-sql,spscream/rom-sql,rom-rb/rom-sql,rom-rb/rom-sql,jamesmoriarty/rom-sql