Btw. without the "with" ;) And it doesn't work.
error: type arguments [bettag.lift.kundenlogin.model.Customer] do not
conform to trait Stamped's type parameter bounds [A <:
net.liftweb.mapper.LongKeyedMapper[A]{def id:
net.liftweb.mapper.MappedLongIndex[A]}]
class Customer extends LongKeyedMapper[Customer]
with IdPK
with ActivateFields[Customer] {..}
object Customer extends Customer
with LongKeyedMetaMapper[Customer]
with Stamped[Customer]
with Activatable[Customer] {}
On 19 Jan., 20:55, Ross Mellgren <[email protected]> wrote:
> 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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