I am trying to use Slick for a database in a Scala application and run some problems (or my misunderstandings) on how to query (find) and convert the result to the case class.
I do not map the case class, but the actual values in order to create the case class on the fly. so my table:
object Tables {
class Names(tag: Tag) extends Table[Name](tag, "NAMES") {
def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
def first = column[String]("first")
def middle = column[String]("last")
def last = column[String]("last")
def * = (id.?, first, middle.?, last) <> ((Name.apply _).tupled, Name.unapply)
}
object NamesQueries {
lazy val query = TableQuery[Names]
val findById = Compiled { k: Rep[Long] =>
query.filter(_.id === k)
}
}
}
and here is the request:
object NamesDAO {
def insertName(name: Name) {
NamesQueries.query += name.copy(id = None)
}
def findName(nameId: Long) = {
val q = NamesQueries.findById(nameId) // AppliedCompiledFunction[Long, Query[Tables.Names, Tables.Names.TableElementType, Seq],Seq[Tables.Names.TableElementType]]
val resultSeq = Database.forConfig("schoolme").run(q.result) // Future[Seq[Tables.Names.TableElementType]]
val result = resultSeq.map { r => // val result: Future[(Option[Long], String, Option[String], String) => Name]
val rr = r.map{ name => // val rr: Seq[(Option[Long], String, Option[String], String) => Name]
Name.apply _
}
rr.head
}
result
}
}
however, the findName method returns Future((Option[Long], String, Option[String], String) => Name)instead Future(Name). What am I doing wrong? Is this just a usage issue asInstanceOf[Name]?
EDIT: An extended findName for smaller snippets with comments for each, as suggested by sap1ens.
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