Question

我有以下Phantom表定义：

package myPackage

import com.outworkers.phantom.CassandraTable
import com.outworkers.phantom.connectors.RootConnector
import com.outworkers.phantom.dsl._
import com.outworkers.phantom.keys.{PartitionKey, PrimaryKey}

import scala.concurrent.Future

case class KeysTwoThreeAndFour(myKeyTwo: Int, myKeyThree: String, myKeyFour: Int)

abstract class MyTable extends CassandraTable[MyTable, Int] with RootConnector {
  object myKeyOne extends IntColumn(this) with PartitionKey
  object myKeyTwo extends IntColumn(this) with PrimaryKey
  object myKeyThree extends StringColumn(this) with PrimaryKey
  object myKeyFour extends IntColumn(this) with PrimaryKey
  object myValue extends IntColumn(this)

  def insertValue(myKeyOne: Int, valuesMap: Map[KeysTwoThreeAndFour, Int]): Future[Unit] = {
    val resultFutures = for ((key: KeysTwoThreeAndFour, myValue) <- valuesMap) yield {
      store(myKeyOne, key.myKeyTwo, key.myKeyThree, key.myKeyFour, myValue).future()
    }


    Future.sequence(resultFutures).map { _ => () }
  }
}

这编译很好，但在运行时抛出以下异常：

java.lang.ClassCastException: scala.Tuple5 cannot be cast to scala.runtime.Nothing$
    at myPackage.MyTable$anon$macro$1$1.store(MyTable.scala:10)
    at com.outworkers.phantom.CassandraTable.store(CassandraTable.scala:125) ~[com.outworkers.phantom-dsl_2.11-2.7.6.jar:2.7.6]
    at myPackage.MyTable$$anonfun$2.apply(MyTable.scala:19)
    at myPackage.MyTable$$anonfun$2.apply(MyTable.scala:18)
    ...

我正在关注Phantom table docs底部的例子，这似乎是什么问题？问题或许是我有一个简单的Int作为我的＆＃34;记录＆＃34;键入而不是实际的类？

我正在使用phantom-dsl 2.7.6，Play Framework 2.3.10和Scala 2.11.11。

请注意，以下代码可以正常工作：

insert
.value(_.myKeyOne, myKeyOne)
.value(_.myKeyTwo, key.myKeyTwo)
.value(_.myKeyThree, key.myKeyThree)
.value(_.myKeyFour, key.myKeyFour)
.value(_.myValue, myValue)
.future()

感谢。

Answer 1

似乎问题是由于“记录”类型是原始的，而不是类;换句话说，将我的Int包装在具有Int作为唯一成员的案例类中解决了问题。

此外，Select语句出现了问题，该问题也得到了解决：

java.util.concurrent.ExecutionException: Boxed Error
    at com.outworkers.phantom.CassandraTable.fromRow(CassandraTable.scala:85) ~[com.outworkers.phantom-dsl_2.11-2.7.6.jar:2.7.6]
    at com.outworkers.phantom.SelectTable$$anonfun$select$1.apply(SelectTable.scala:24) ~[com.outworkers.phantom-dsl_2.11-2.7.6.jar:2.7.6]
    at com.outworkers.phantom.SelectTable$$anonfun$select$1.apply(SelectTable.scala:24) ~[com.outworkers.phantom-dsl_2.11-2.7.6.jar:2.7.6]
    at com.outworkers.phantom.builder.query.SelectQuery.fromRow(SelectQuery.scala:59) ~[com.outworkers.phantom-dsl_2.11-2.7.6.jar:2.7.6]
    at com.outworkers.phantom.builder.query.RootExecutableQuery$class.singleResult(ExecutableQuery.scala:176) ~[com.outworkers.phantom-dsl_2.11-2.7.6.jar:2.7.6]
    at com.outworkers.phantom.builder.query.SelectQuery.singleResult(SelectQuery.scala:33) ~[com.outworkers.phantom-dsl_2.11-2.7.6.jar:2.7.6]

Phantom生成的`store`方法在运行时抛出ClassCastException

1 个答案: