Updating table with enum

Trying to insert the information into DB that looks like this:

(UUID, EnumType)

with following logic:

var t = TestTable.query.map(t=> (t.id, t.enumType)) ++= toAdd.map(idTest, enumTest)))

but compiler throws an error for TestTable.query.map(t=> (t.id, t.enumType)) it's interpriting it as type Iteratable[Nothing], am I missing something?

Test table looks like this:

object TestTable {
  val query = TableQuery[TestTable]
}

class TestTable(tag: slick.lifted.Tag) extends Table[TestTable](tag, "test_table") {
  val id = column[UUID]("id")
  val enumType = column[EnumType]("enumType")

  override val * = (id, testType) <> (
    (TestTable.apply _).tupled,
    TestTable.unapply
  )

Solution

Suppose you have following data structure:

object Color extends Enumeration {
  val Blue = Value("Blue")
  val Red = Value("Red")
  val Green = Value("Green")
}

case class MyType(id: UUID, color: Color.Value)

Define slick schema as following:

class TestTable(tag: slick.lifted.Tag) extends Table[MyType](tag, "test_table") {
  val id = column[UUID]("id")
  val color = column[Color.Value]("color")

  override val * = (id, color) <> ((MyType.apply _).tupled, MyType.unapply)
}

object TestTable {
  lazy val query = TableQuery[TestTable]
}

To map enum to SQL data type slick requires implicit MappedColumnType:

implicit val colorTypeColumnMapper: JdbcType[Color.Value] = MappedColumnType.base[Color.Value, String](
  e => e.toString,
  s => Color.withName(s)
)

Now you can insert values into DB in this way:

val singleInsertAction = TestTable.query += MyType(UUID.randomUUID(), Color.Blue)

val batchInsertAction = TestTable.query ++= Seq(
  MyType(UUID.randomUUID(), Color.Blue),
  MyType(UUID.randomUUID(), Color.Red),
  MyType(UUID.randomUUID(), Color.Green)
)