为抽象类创建映射列类型Scala Slick

Question

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) 
) 

，但我得到一个编译器错误，指出：

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) } 

时，我清楚地声明address作为一个字段的情况下类的内部。我觉得这可能是我的一个非常愚蠢的错误。为什么我的地址栏不可见？

Answer 1

您示例中的address对构造函数是私有的。为了让它与吸气剂一起公开，将val添加到它的正面如下：

sealed abstract class Address(val address: String) 

HTH。