Slick: dynamic sortBy in a query with left join

Question

This is a problem derived from another question. I need to be able to dynamically pass a column to be sorted on in a Slick query which has a left join. The problem in this p

Answer 1

.? is implemented using <> which prevents you from later accessing members. So you need to apply the sorting before you do the .?

    val data = for {
        (computer, company) <- Computer.where(_.name like filter) leftJoin
            Company on (_.companyId === _.id)
    } yield (computer, company) // <- no .?

    val sortedData = orderBy match {
        case 2 => data.sortBy(_._1.name) //Works ok, column from a primary table
        case 3 => data.sortBy(_._2.name) //Error "Cannot resolve symbol name", because table is optional
    }

    val optionalJoinData = sortedData.map{
      case (computer, company) => (computer, company.?)
    } // <- do .? last