使用Scala applicative将List [Object]转换为case类(Using Scala applicative to convert List[Object] to case class)

 我正在编写一个使用Datomic作为后端数据库的Scala Play Framework应用程序。 
 
 当我查询Datomic时，它返回“rows”作为java.lang.Object的List s的java.util.List 。 例如： 
 
[
  [ "Joe", "1970-04-15" ],
  [ "Mary", "1975-06-01" ]
]
 
 我想以最可靠的Scala惯用方式将这些转换为案例类。 
 
 目前我的代码如下所示： 
 
import org.joda.time._
case class Person(name: String, dateOfBirth: LocalDate)

// assuming the query returns 1 row, get the row List
val row = result.iterator.next  // e.g.: [ "Joe", "1970-04-15" ]
User(row.get(0).asInstanceOf[String],
     LocalDate.parse(row.get(1).asInstanceOf[String]))
 
 这有点丑陋且容易出错。 
 
 有没有办法使用applicative functors来实现同样的目的？ 应用仿函数是最好的方法吗？ 有没有更好的办法？ 

I am writing a Scala Play Framework application that uses Datomic as a back-end database.
 
When I query Datomic, it returns "rows" as java.util.Lists of Lists of java.lang.Objects. For example:
 
[
  [ "Joe", "1970-04-15" ],
  [ "Mary", "1975-06-01" ]
]
 
I would like to convert these to case classes in the most Scala-idiomatic way possible.
 
Currently my code looks like this:
 
import org.joda.time._
case class Person(name: String, dateOfBirth: LocalDate)

// assuming the query returns 1 row, get the row List
val row = result.iterator.next  // e.g.: [ "Joe", "1970-04-15" ]
User(row.get(0).asInstanceOf[String],
     LocalDate.parse(row.get(1).asInstanceOf[String]))
 
That's sort of ugly and error-prone.
 
Is there a way to use applicative functors to achieve the same thing? Are applicative functors the best way to do this? Is there a better way?

原文：https://stackoverflow.com/questions/20841284