I think my simple solution does not work... and the implementation of
MappedPassword is not really easy to understand. I thought such
classes
would be nice for datatypes as Currency, Timespan etc... that appear
everwhere
in the application but where own tables are not useful.
The solution of Naftoli, I tried... but maybe I did something wrong:
trait MyMappedTimeSpan[T <:Mapper[T]]{
import net.liftweb.util._
import net.liftweb.http.S
import xml.NodeSeq
object from extends MappedTime[T](this.asInstanceOf[T])
object to extends MappedTime[T](this.asInstanceOf[T])
}
class Bericht extends LongKeyedMapper[Bericht] with IdPK with OneToMany
[Long, Bericht]{
override def getSingleton = Bericht
object mittag extends MyMappedTimeSpan[Bericht]
...
If someone found a simple solution, please tell me so :)
hyperion
On 16 Okt., 22:01, David Pollak <feeder.of.the.be...@gmail.com> wrote:
> 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 frameworkhttp://liftweb.net
> Beginning Scalahttp://www.apress.com/book/view/1430219890
> Follow me:http://twitter.com/dpp
> Surf the harmonics
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