Using a function in an insert statement in Slick - scala

Question

Is it possible to use a user defined function in an insert statement in slick? This is what my tables look like, but I'm getting an error when I try to run it.
case class User(username: String, email: String)
class Users(tag: Tag)
extends Table[User](tag, "users") {
def username = column[String]("username", O.PrimaryKey)
def email = column[String]("email", O.NotNull)
def password = column[String]("password", O.NotNull)
def preferences = column[JsValue]("preferences")
def idx = index("idx_users_email", email, unique = true)
def group = foreignKey("fk_group", username, groups)(_.groupname)
def * = (username, email) <> (User.tupled, User.unapply)
def withPassword = (username, email, password) <>[(User, String), (String, String, String)](
{ case (u: String, e: String, p: String) => (User(u, e), p)},
{ case (r: User, p: String) => Some((r.username, r.email, p))}
)
}
object users extends TableQuery(new Users(_)) {
val crypt = SimpleFunction.binary[String, String, String]("crypt")
val gen_salt = SimpleFunction.binary[String, Option[Int], String]("gen_salt")
def createUser(u: String, e: String, p: String)(implicit session: Session) = {
val user = User(u, e)
val s = this.map {c =>(c.username, c.password, users.crypt(c.password, users.gen_salt(LiteralColumn("bf"), LiteralColumn(7))))}
s insertExpr (u, e, p)
}
}
When I run this code, I get the error
SlickException: : Cannot use node
scala.slick.lifted.SimpleFunction$$anon$2#69ade8b0 crypt, false for
inserting data
I've tried several different ways of trying to get my inserts to work. Including this:
def withPassword = (username, email, users.crypt(password, users.gen_salt(LiteralColumn("bf"), LiteralColumn(7)))) <>[(User, String), (String, String, String)](
{ case (u: String, e: String, p: String) => (User(u, e), p)},
{ case (r: User, p: String) => Some((r.username, r.email, p))}
)
Am I just expecting too much for slick to be able to do what I want to and just break down and use raw SQL?

Answer 1

Not supported, but we have a ticket for it with unclear future: https://github.com/slick/slick/issues/928
Besides, encryption is almost always better handled on the client-level. Database-level encryption has very limited security guarantees, because you are sending the keys to the place where the encrypted data is stored. More info in the above ticket.