Scala+Slick - Get counts on GroupBy results - scala

Question

I'm trying to get counts from a DB using a groupBy on my Scala+Slick code.
Here's my partial code :
object DBJobs extends Table[DBJob]("encoder_job") {
object Status extends Enumeration {
val local = Value("LOCAL")
val encoding = Value("ENCODING")
val done = Value("DONE")
val error = Value("ERROR")
}
implicit val StatusMapper = MappedTypeMapper.base[Status.Value, String] (
{x => x.toString},
{x => x match {case "LOCAL"=>Status(0);case "ENCODING"=>Status(1);case "DONE"=>Status(2);case "ERROR"=>Status(3)}}
)
def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
def status = column[DBJobs.Status.Value]("status", O.NotNull)
def getStats()(implicit session:Session):mutable.Map[Status.Value, Int] = {
var map = mutable.Map[Column[Status.Value], Column[Int]]()
val q = (for { j <- DBJobs } yield (j)).groupBy(_.status).map{
case (s, results) =>
map = map += (s -> results.length)
}
map
}
}
My problem is how to put data in my Map as [DBJobs.Status, Int] instead of [Column[Status.Value], Column[Int]].
Here's the SQL equivalent :
SELECT COUNT( 1 ), status FROM encoder_job GROUP BY STATUS
Slick version: 1.0.1
Thanks

Answer 1

def getStats()(implicit session:Session):mutable.Map[Status.Value, Int] = {
Query(DBJobs).groupBy(_.status).map{
case (s, results) => (s -> results.length)
}
}
// usage
val results = getStats.run
Be aware that putting methods in the table object directly cannot be easily migrated to Slick 2.0. Put them separate, e.g. as method extensions. Also see https://groups.google.com/d/msg/scalaquery/xNtPT6sexXI/zlkgxv6lZ6YJ