I need an ability to create a User object by providing all the values except id in certain cases, such that the User object takes care of assigning itself an auto-generated value.
For this I have overloaded the apply method in the companion object, like shown below. But this is causing the compile time error: value tupled is not a member of object.
Solutions mentioned on StackOverflow and other blogs aren't working, such as: http://queirozf.com/entries/slick-error-message-value-tupled-is-not-a-member-of-object
case class User(id: Long, firstName: String, lastName: String, mobile: Long, email: String)
object User {
private val seq = new AtomicLong
def apply(firstName: String, lastName: String, mobile: Long, email: String): User = {
User(seq.incrementAndGet(), firstName, lastName, mobile, email)
}
}
class UserTableDef(tag: Tag) extends Table[User](tag, "user") {
def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
def firstName = column[String]("first_name")
def lastName = column[String]("last_name")
def mobile = column[Long]("mobile")
def email = column[String]("email")
override def * =
(id, firstName, lastName, mobile, email) <> (User.tupled, User.unapply)
}
The source of your problem is that overloaded apply def.
tupled does not work with case class's with less than 2 parameters or overloaded apply.
As far as slick's * (or all) mapping and <> is concerned, it is supposed to be like,
def * = (tupleMember1, tupleMember2, ...) <> (func1, func2)
Such that,
func1 takes that tuple (tupleMember1, tupleMember2, ...) as input and returns an instance of mapped class/case class.func2 takes an instance of mapped class/case class and returns that tuple (tupleMember1, tupleMember2, ...).So you can provide any function... which meets these requirements.
case class User(id: Long, firstName: String, lastName: String, mobile: Long, email: String)
object User {
private val seq = new AtomicLong
def apply(firstName: String, lastName: String, mobile: Long, email: String): User = {
User(seq.incrementAndGet(), firstName, lastName, mobile, email)
}
def mapperTo(
id: Long, firstName: String,
lastName: String, mobile: Long, email: String
) = apply(id, firstName, lastName, mobile, email)
}
class UserTableDef(tag: Tag) extends Table[User](tag, "user") {
def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
def firstName = column[String]("first_name")
def lastName = column[String]("last_name")
def mobile = column[Long]("mobile")
def email = column[String]("email")
override def * =
(id, firstName, lastName, mobile, email) <> ((User.mapperTo _).tupled, User.unapply)
}