scala – Slick：过滤所有joda DateTime日期等于今天的记录

实现它的一种方法是这样的：

val Now = DateTime.Now

val today = Now.toLocalDate
val tomorrow = today.plusDays(1)

val startOfToday = today.toDateTimeAtStartOfDay(Now.getZone)
val startOfTomorrow = tomorrow.toDateTimeAtStartOfDay(Now.getZone)

val todayLogItems = logItems.filter(logItem =>
  logItem.MyDateTime >= startOfToday && logItem.MyDateTime < startOfTomorrow
).list

有没有办法以更简洁的方式编写查询？有点像：

logItems.filter(_.MyDateTime.toDate == DateTime.Now.toDate).list

我问这个是因为LINQ to NHibernate是可以实现的(Fetching records by date with only day part comparison using nhibernate).

解决方法

除非Slick joda映射器增加对比较的支持,否则你运气不好,除非你自己添加它.为了给它一个镜头,这些可能是有用的指针：
* http://slick.typesafe.com/doc/2.0.0/userdefined.html
* http://slick.typesafe.com/doc/2.0.0/api/#scala.slick.lifted.ExtensionMethods
* https://github.com/slick/slick/blob/2.0.0/src/main/scala/scala/slick/lifted/ExtensionMethods.scala

我创建了一张在Slick中查看它的票证：https://github.com/slick/slick/issues/627