How about structural typing?
trait Stamped[A <: LongKeyedMapper[A] with { val id: MappedLongIndex[A] }] ...
I haven't tried it, but maybe it will work.
-Ross
On Jan 19, 2010, at 2:47 PM, Franz Bettag wrote:
>
>
> On 19 Jan., 19:32, David Pollak <[email protected]> wrote:
>>> i am trying to extend my logging trait. The Problem is, i can't say
>>> something like A <: LongKeyedMapper[A] in my trait since ProtoUser
>>> doesn't use IdPK but uses it's own declarations (which look the same
>>> to me).
>>
>> Why do you need ProtoUser extended with IdPK? Why can't your trait work
>> with LongKeyedMapper?
>
> The code relies on having a .id method on the passed object. The Three
> Traits are below. It works fine with anything having IdPK. At the
> moment i have this code copied into my User singleton which is exactly
> what i want to avoid.
>
> I don't know how i would dynamify the use of the .id method. In
> ActionLog and the Stamped trait.
>
> trait Stamped[A <: LongKeyedMapper[A] with IdPK]
> extends SkipLogging with KeyedMetaMapper[Long, A] {
>
> self: A with MetaMapper[A] with KeyedMapper[Long, A] =>
>
> override def afterCreate = (crudLog(_: A, "create")) ::
> super.afterCreate
>
> override def afterUpdate = (crudLog(_: A, "update")) ::
> super.afterUpdate
>
> override def afterDelete = (crudLog(_: A, "delete")) ::
> super.afterDelete
>
> private def crudLog(obj: A, action: String): Unit = {
> if (!self.skipLogging) {
> val log = new ActionLog
>
> log.action(action).klass(obj.getClass.getName).record(obj.id).save
> }
> }
>
> }
>
>
> trait SkipLogging {
>
> var skipLogging = false
> }
>
>
> trait ActionLogs[A <: Mapper[A] with IdPK] {
>
> this: A =>
>
> def logs: List[ActionLog] = ActionLog.findAll(
> By(ActionLog.klass, this.getClass.getName),
> By(ActionLog.record, this.id)
> )
>
> }
>
>
>
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