比较过滤器中的joda.DateTime

Question

我正在尝试在过滤器中使用日期时间的Column [DateTime]，但无法弄清楚如何使其工作。

import play.api.Play.current 
import play.api.db.slick.Config.driver.simple._ 
import play.api.db.slick._ 
import org.joda.time.{DateTime, DateTimeComparator, DateTimeZone} 

    private val dateComparator = DateTimeComparator.getInstance() 

    implicit def dateTimeToScalaWrapper(dt: DateTime): DateTimeWrapper = new DateTimeWrapper(dt) 

    class DateTimeWrapper(dt: DateTime) extends Ordered[DateTime] with Ordering[DateTime] { 
    def compare(that: DateTime): Int = dateComparator.compare(dt, that) 
    def compare(a: DateTime, b: DateTime): Int = dateComparator.compare(a, b) 
    } 

    implicit def jodaType = MappedColumnType.base[DateTime, Timestamp](
    {d => new Timestamp(d.getMillis)} , 
    {d => new DateTime(d.getTime, UTC)} 
) 

    def removeTimeSlots(start: DateTime, end: DateTime, reservationId: Long) : Int = DB withTransaction { implicit session => 
    timeSlots.filter(x => x.reservationId == reservationId && x.startTime >= start && x.starTime <= end).delete 
    } 

在这里我比较x.startTime开始我得到以下错误点：

Error:(90, -1) Play 2 Compiler: 
Reservations.scala:90: polymorphic expression cannot be instantiated to expected type; 
    found : [R]scala.slick.lifted.Column[R] 
    required: Boolean 

任何机会，我可以把这些比较在我的代码？

Answer 1

里面filter,map等在Slick中你只能使用可以转换成SQL的代码;显然它不能使用像DateTimeComparator或DateTimeWrapper这样的任意Java/Scala类。油滑doesn't seem to support datetime comparison currently;你可能想看这个问题。另请参阅Slick: Filtering all records which have a joda DateTime date equal to today。

Answer 2

这jodatime映射器是真正有用Plya！ ：https://github.com/tototoshi/slick-joda-mapper