trait Stamped[A <: LongKeyedMapper[A]]
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.primaryKey).save
// Stamped.scala:54: error: value primaryKey is not a member of A
}
}
}
On 19 Jan., 21:22, David Pollak <feeder.of.the.be...@gmail.com> wrote:
> You don't need to use structural typing.
>
> Any KeyedMapper has a primaryKey method that returns a Mapped field of the
> type of the key. To get the primary key field of a given KeyedMapper
> instance, just call primaryKey.
>
>
>
> On Tue, Jan 19, 2010 at 11:55 AM, Ross Mellgren <dri...@gmail.com> 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 <feeder.of.the.be...@gmail.com> 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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> --
> Lift, the simply functional web frameworkhttp://liftweb.net
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