Play Slick: How to fetch selected fields from a DB table in play-slick 3.0.0? - scala

Question

I am new to play framework. I am working on a play slick based application where I want to fetch a list of objects from DB which will contains some selected fields. For fetching all the fields I am using following code:
case class Mail(txID: String,
timeStamp: Long,
toUserID: String,
mailContent: String,
mailTemplateFileName: String,
fromID: String,
toID: String
)
def getLogFromIDFuture(userID: String): Future[Option[List[Mail]]] = cache.getOrElseUpdate[Option[List[Mail]]](userID) {
val resultingUsers = db.run(mailsData.filter(x => x.toUserID === userID).result)
val res = Await.result(resultingUsers, Duration.Inf)
res.map(t => t) match {
case t if t.nonEmpty =>
Future(Some(t.toList))
case _ => Future(None)
}
}
So my question is how to fetch only timeStamp, toUserID, mailContent, fromID, toID fields as the list of objects like UserMessage(timeStamp: Long, toUserID: String, mailContent: String, fromID: String, toID: String). I tried searching about this but didn't get any convincing answers.

Answer 1

Like I said in the comment you can do this:
def getLogFromIDFuture(userID: String): Future[Option[List[UserMessage]]] = cache.getOrElseUpdate[Option[List[Mail]]](userID) {
val resultingUsers = db.run(mailsData.filter(x => x.toUserID === userID).map(entry =>(entry.timeStamp, entry.toUserID, entry.mailContent, entry.fromID, entry.toID))
.result)// here you have the tuple of things
// add the mapping of the tuple to the UserMessage
val res = Await.result(resultingUsers, Duration.Inf)
res.map(t => t) match {
case t if t.nonEmpty =>
Future(Some(t.toList))
case _ => Future(None)
}
}
You can get rid of that Await.result
resultingUsers.map( match {
case t if t.nonEmpty =>
Some(t.toList)
case _ => None
}
)
Hope it helps.