squeryl enum as string but not as ints

Question

I have an enum type

object UserState extends Enumeration {
  type UserState = Value
  val unconfirmed = Value("unconfirmed")
  val locked = Value("locked")
  val active = Value("active")
}

class User {
  val state: UserState.Value
}

And try to execute query

from(MySchema.users)
  (u => where(u.state === UserState.unconfirmed) select(u))
  .headOption

But the resulting sql have something like users.state = 0 instead of users.state = 'unconfirmed'. How to have squeryl treat enum as string rather then int?

And also this is a lift-based application. And I try to use EnumFeild of squeryl-record. May be there a lift-based desigion does exist?