如何通过Kotlin Exposed ORM使用Postgresql枚举类型？

Question

我已经将某些Postgresql类型添加到Exposed作为扩展。它有两个就绪类型，分别名为enumeration和enumerationByName。我测试了这两者，但都没有成功将Postgre枚举类型映射到Kotlin枚举类。在读写中都会引发错误

enum class TicketStatus(val status: String) {
    Open("open"),
    Close("close"),
    InProgress("in_progress")
}

class Ticket(id: EntityID<UUID>) : Entity<UUID>(id) {
    companion object : EntityClass<UUID, Ticket>(Tickets)

    var geom by Tickets.geom
    var description by Tickets.description
    var status by Tickets.status
    var createdAt by Tickets.createdAt
    var updatedAt by Tickets.updatedAt
    var owner by Tickets.owner
}

阅读时：

java.lang.IllegalStateException: open is not valid for enum TicketStatus

Answer 1

您应该声明状态列，如下所示：

object Tickets: Table() {
   val status = enumeration("status", TicketStatus::class.java) // will create integer column
   val status = enumerationByName("status", TicketStatus::class.java) // will create varchar with TicketStatus names
}