Slick Error Message: 'value tupled is not a member of object'
Last updated:Sometimes when declaring classes and projections in Slick you get stuck with the following error message:
value tupled is not a member of object
This looks like it's caused by a known bug. There's also a github discussion on that very issue here and some discussion of potential workarounds.
This happens when you declare a companion object with the same name as the case class and try to base a slick table on it
I applied the mentioned workaround when defining the *projection; look at the following snippet:
package models
import java.sql.Date
import play.api.db.slick.Config.driver.simple._
import play.api.Play.current
import scala.slick.lifted.Tag
case class User(
id: Long,
username: String,
email: Option[String],
password: String,
createdAt: Date)
class Users(tag: Tag) extends Table[User](tag, "users") {
def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
def username = column[String]("username", O.NotNull)
def email = column[String]("email", O.Nullable)
def password = column[String]("password", O.NotNull)
def createdAt = column[Date]("createdAt", O.NotNull)
// workaround successfully applied
def * = (id, username, email.?, password, createdAt) <> ((User.apply _).tupled, User.unapply)
}
object User{
val users = TableQuery[Users]
//perhaps some helper methods here, such as
def findById(id: Long)(implicit s: Session): Option[User] = {
//returns option(list(0))
users.filter(_.id === id).list.headOption
}
}
It seems that this error occurs when you have a class (which defines a database table) and a companion object with the same name.