[Lift] Re: (created|updated|deleted)_(by|at) trait
Hi Franz,
Here's what I did, roughly:
trait TimeStamped[OwnerType <: ExtMapper[OwnerType]] {
this: ExtMapper[OwnerType] =>
private val thisTyped = this.asInstanceOf[MapperType]
object createdOn extends ExtMappedDateTime(thisTyped) with
LifecycleCallbacks {
override def beforeCreate = this(new Date)
}
object updatedOn extends ExtMappedDateTime(thisTyped) with
LifecycleCallbacks {
override def beforeUpdate = this(new Date)
}
}
trait ExtMapper[OwnerType <: ExtMapper[OwnerType]] extends
Mapper[OwnerType]
with TimeStamped[OwnerType] with UserStamped[OwnerType]
{
self: OwnerType =>
// A lot more stuff here ...
}
Best,
Clemens
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[Lift] Re: (created|updated|deleted)_(by|at) trait
Ah, i tried a bit more, now it works ;)
trait BaseModel extends BaseLongKeyedMapper {
object created_by extends MappedLongForeignKey(this.asInstanceOf
[MapperType], User)
object created_at extends MappedDateTime(this.asInstanceOf
[MapperType])
object updated_by extends MappedLongForeignKey(this.asInstanceOf
[MapperType], User)
object updated_at extends MappedDateTime(this.asInstanceOf
[MapperType])
object deleted_by extends MappedLongForeignKey(this.asInstanceOf
[MapperType], User)
object deleted_at extends MappedDateTime(this.asInstanceOf
[MapperType])
}
On Apr 11, 2:09 am, David Pollak
wrote:
> The not overly helpful answer... please look for the IdPK trait... you can
> see how to do stuff like this.
> If you're still stuck, I'll provide a more helpful answer.
>
>
>
> On Fri, Apr 10, 2009 at 4:39 PM, Franz Bettag wrote:
>
> > Hey guys,
>
> > i had the (simple) idea of creating a trait for these fields:
>
> > object created_by extends MappedLongForeignKey(this, User)
> > object created_at extends MappedDateTime(this)
> > object updated_by extends MappedLongForeignKey(this, User)
> > object updated_at extends MappedDateTime(this)
> > object deleted_by extends MappedLongForeignKey(this, User)
> > object deleted_at extends MappedDateTime(this)
>
> > Any ideas how i might do that? I've tried a few things but nothing
> > worked. A simple example would be enought to get me going ;)
>
> > Thanks in advance
>
> --
> Lift, the simply functional web frameworkhttp://liftweb.net
> Beginning Scalahttp://www.apress.com/book/view/1430219890
> Follow me:http://twitter.com/dpp
> Git some:http://github.com/dpp
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[Lift] Re: (created|updated|deleted)_(by|at) trait
The trait as in
http://scala-tools.org/scaladocs/liftweb/1.0/net/liftweb/mapper/Mapper.scala.html
(line 296):
trait IdPK extends BaseLongKeyedMapper {
def primaryKeyField = id
object id extends MappedLongIndex[MapperType](this.asInstanceOf
[MapperType])
}
i don't know how MapperType works, anyway this is my non-working
version:
trait BaseModel extends BaseLongKeyedMapper {
object created_by extends MappedLongForeignKey(this, User)
object created_at extends MappedDateTime(this)
object updated_by extends MappedLongForeignKey(this, User)
object updated_at extends MappedDateTime(this)
object deleted_by extends MappedLongForeignKey(this, User)
object deleted_at extends MappedDateTime(this)
}
produces this on every Mapped* object:
BaseModel.scala:14: error: inferred type arguments
[my.app.model.BaseModel,my.app.model.User] do not conform to class
MappedLongForeignKey's type parameter bounds [T <:
net.liftweb.mapper.Mapper[T],O <: net.liftweb.mapper.KeyedMapper
[Long,O]]
i tried a few things but didn't get behind it. I guess it's because i
also don't know what to do with MapperType like in the IdPK trait.
On Apr 11, 2:09 am, David Pollak
wrote:
> The not overly helpful answer... please look for the IdPK trait... you can
> see how to do stuff like this.
> If you're still stuck, I'll provide a more helpful answer.
>
>
>
> On Fri, Apr 10, 2009 at 4:39 PM, Franz Bettag wrote:
>
> > Hey guys,
>
> > i had the (simple) idea of creating a trait for these fields:
>
> > object created_by extends MappedLongForeignKey(this, User)
> > object created_at extends MappedDateTime(this)
> > object updated_by extends MappedLongForeignKey(this, User)
> > object updated_at extends MappedDateTime(this)
> > object deleted_by extends MappedLongForeignKey(this, User)
> > object deleted_at extends MappedDateTime(this)
>
> > Any ideas how i might do that? I've tried a few things but nothing
> > worked. A simple example would be enought to get me going ;)
>
> > Thanks in advance
>
> --
> Lift, the simply functional web frameworkhttp://liftweb.net
> Beginning Scalahttp://www.apress.com/book/view/1430219890
> Follow me:http://twitter.com/dpp
> Git some:http://github.com/dpp
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[Lift] Re: (created|updated|deleted)_(by|at) trait
The not overly helpful answer... please look for the IdPK trait... you can see how to do stuff like this. If you're still stuck, I'll provide a more helpful answer. On Fri, Apr 10, 2009 at 4:39 PM, Franz Bettag wrote: > > Hey guys, > > i had the (simple) idea of creating a trait for these fields: > > object created_by extends MappedLongForeignKey(this, User) > object created_at extends MappedDateTime(this) > object updated_by extends MappedLongForeignKey(this, User) > object updated_at extends MappedDateTime(this) > object deleted_by extends MappedLongForeignKey(this, User) > object deleted_at extends MappedDateTime(this) > > Any ideas how i might do that? I've tried a few things but nothing > worked. A simple example would be enought to get me going ;) > > Thanks in advance > > > > -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Lift" group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
