Hi, I am new to Scala and have a problem with the following example:
import scala.slick.driver.MySQLDriver.simple._
case class Customer(id: Option[Long], firstName: String, lastName: String, birthday: Option[java.util.Date])
/**
* Mapped customers table object.
*/
object Customers extends Table[Customer]("customers") {
def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
def firstName = column[String]("first_name")
def lastName = column[String]("last_name")
def birthday = column[java.util.Date]("birthday", O.Nullable)
def * = id.? ~ firstName ~ lastName ~ birthday.? <>(Customer, Customer.unapply _)
implicit val dateTypeMapper = MappedTypeMapper.base[java.util.Date, java.sql.Date](
{
ud => new java.sql.Date(ud.getTime)
}, {
sd => new java.util.Date(sd.getTime)
})
val findById = for {
id <- Parameters[Long]
c <- this if c.id is id
} yield c
}
What is the meaning of the line:
def * = id.? ~ firstName ~ lastName ~ birthday.? <>(Customer, Customer.unapply _)
How to interpret tilde marks and question marks?
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