scala - Slick update return the updated object -

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i'm trying have function return updated object after db runs update method on query right now, can't figure out how return object. function wrote using examples found, extend q.update(cat) return future[cat].

def update(id: long, cat: cat): future[unit] = db.run {   val q = { c <- cats if c.id === id } yield c   q.update(cat).map(_ => ()) }

you should try following:

def update(id: long, cat: cat): future[option[cat]] = db.run {   cats.filter(_.id === id).update(cat).map {     case 0 => none     case _ => some(cat)   } }

you should return future[option[cat]] instead of future[cat], because cat provided id might not exist (the update method returns 0 value then). violating integrity constraints result in failure of future.


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