On Fri, Oct 16, 2009 at 9:42 AM, Naftoli Gugenheim <naftoli...@gmail.com>wrote:
>
> I think there is support somewhere in the MappedField hierarchy for a
> MappedField that represents to database columns. Take a look at
> MappedPassword.
>
Having a field represent two columns (as MappedPassword does) is a huge
piece of pain. I've made a ton of mistakes with Mapper, but the biggest,
nastiest shining hairball of a mistake was compound columns. Have I scared
anyone off using them yet?
>
>
> -------------------------------------
> harryh<har...@gmail.com> wrote:
>
>
> Make MyMappedTimeSpan a trait:
>
> trait MyMappedTimeSpan[T <:Mapper[T]](val owner: T) {
> object from extends MappedTime[MapperType](this.asIntanceOf
> [MatterType])
> object to extends MappedTime[MapperType](this.asIntanceOf
> [MatterType])
> }
>
> And then use it like so:
>
> class DBObject extends LongKeyedMapper[Bericht] with IdPK with
> MyMappedTimeSpan[DBObject] {
> }
>
> -harryh
>
> On Oct 16, 8:08 am, hyperion <hyperion1...@googlemail.com> wrote:
> > Hello,
> >
> > I tried this:
> >
> > class MyMappedTimeSpan[T <:Mapper[T]](val owner: T){
> > import net.liftweb.util._
> > import net.liftweb.http.S
> > import xml.NodeSeq
> >
> > val from = new MappedTime(owner)
> > val to = new MappedTime(owner)
> > }
> >
> > class DBObject extends LongKeyedMapper[Bericht] with IdPK {
> >
> > def getSingleton = Bericht
> > ...
> > object test extends MyMappedTimeSpan(this)
> >
> > }
> >
> > and bound this class with:
> > "from" -> bt.test.from.toForm,
> > "to" -> bt.test.to.toForm,
> >
> > In html:
> > <tr>
> > <td><bt:von/></td>
> > <td><bt:nach/></td>
> > </tr>
> >
> > Everything worked fine... except that my timespan is completely
> > ignored in the database ;). I think the reason is you use reflection
> > on class DBObject to find all values that should be stored in the
> > dabase?... but I have not inspected the source code jet... I am new to
> > lift and also to scala....
> >
> > My Question: Is it possible to build such Datatypes based on two or
> > more DB-Fields of the single table...?... I think even they are
> > mapped to the "master"-DB-table, such types could be helpful...
> >
> > Greetz
>
>
> >
>
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
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