为抽象类Scala Slick创建映射列类型

我正在尝试为我拥有的抽象案例类创建一个

MappedCOlumnType

sealed abstract class Address(address: String)
implicit val addressToString = MappedColumnType.base[Address, String](
  addr => addr.address,
  addr => AddressUtil.address(addr)
)

但我收到一个编译器错误，说明：

value address is not a member of com.suredbits.core.protocol.Address
[error]  Note: implicit value addressToString is not applicable here because it comes after the application point and it lacks an explicit result type
[error]   {addr => addr.address } , { addr => AddressUtil.address(addr) }

---

当我将

地址

明确声明为case类中的字段时。我觉得这对我来说可能是一个极其愚蠢的错误。为什么我的地址字段不可见

示例中的

地址

是构造函数的私有地址。要使用getter将其公开，请在其前面添加

val

，如下所示：

sealed abstract class Address(val address: String)

嗯