Slick中嵌套类的隐式GetResult

Question

From what I've read, there is a way to work with nested classes to solve the problem of tables with more than 22 fields. It looks like this (with a simple table):

case class UserRow(id:Int, address1:Address, address2:Address)
case class Address(street:String,city:String)

class User(tag:Tag) extends Table[UserRow](tag, "User"){
  def id = column[Int]("id", O.PrimaryKey)
  def street1 = column[String]("STREET1")
  def city1 = column[String]("CITY1")
  def street2 = column[String]("STREET2")
  def city2 = column[String]("CITY2")
  def * = (id, address1, address2) <> (UserRow.tupled, UserRow.unapply)
  def address1 = (street1, city1) <> (Address.tupled, Address.unapply)
  def address2 = (street2, city2) <> (Address.tupled, Address.unapply)
}

What I've realized is that plain SQL - which requires implicit values - doesn't work with this solution or at least I haven't been able to make it works.

I thought I could define the implicit values in the same way as the nested classes, like this:

implicit val getAddressResult = GetResult(r => Address(r.<<, r.<<))
implicit val getUserResult = GetResult(r => UserRow(r.<<, r.<<, r.<<))

But it doesn't work. It compiles but when running, it says that the user table is not found.

I'm very new in Scala and Slick so I could have misunderstood some information or have some wrong concepts. What am I doing wrong?

UPDATE

This is what I'm doing in the test:

user.ddl.create
user += UserRow(0, Address("s11", "c11"), Address("s12", "c12"))
user += UserRow(1, Address("s21", "c21"), Address("s22", "c22"))
user += UserRow(2, Address("s31", "c31"), Address("s32", "c32"))
println(user.list)
val sqlPlain = sql"SELECT * FROM user".as[UserRow]
println(sqlPlain)
println(sqlPlain.list)

All of it works until the last sentence where I get the error "Table "USER" not found". Also the exact same test works perfect for a non nested case class.

UPDATE 2

As cvogt has correctly indicated to me, I was misunderstanding the error reported and it wasn't related to the implicit GetResult values. His answer is correct as well as my first approach.

Answer 1

Pass the PositionedResult r to the corresponding GetResult objects:

implicit val getAddressResult = GetResult(r => Address(r.<<, r.<<))
implicit val getUserResult =
  GetResult(r => UserRow(r.<<, getAddressResult(r), getAddressResult(r)))