On Thu, Aug 27, 2009 at 10:26 AM, rstradling <[email protected]>wrote:
>
> With a parser combinator I wrote to parse .sql and it outputs scala
> orm files.
Care to share? That'd be a pretty darned useful utility!
> Please note it is very specific to my needs (i.e. only
> works with certain grammars (INSERTS) but that particular grammar is
> all I needed to process at the time) but is written in a way that
> could be extended to the full grammar (at least that was my
> intent :)..
So... the problem is that objects in Scala are not subclassible. What does
this mean? For example:
trait Foo {
object bar extends AnyRef
}
trait MyFoo extends Foo {
override object bar {
def cantDoIt = "sigh"
}
}
Back in the Scala 2.5 days, there was some talk about allowing this to
happen, but it never did. So, unfortunately, I can't think of a way for
your sql generator to create a superclass that could be subclassed and have
the effect that you want.
Sorry/
>
>
>
> On Aug 27, 1:09 pm, Naftoli Gugenheim <[email protected]> wrote:
> > How do you auto-generate them?
> >
> > On Thu, Aug 27, 2009 at 1:03 PM, rstradling <[email protected]>
> wrote:
> >
> > > I am using Lift 1.0 with the Mapper ORM module from Lift. I am a
> > > newbie to Scala and Lift. I have auto-generated my ORM classes from
> > > a .sql file. Given that these classes are auto-generated I would
> > > prefer not to edit them directly and provide additional functionality
> > > via inheritance.
> >
> > > Say I have the following...
> > > class StatGenerated extends LongKeyedMapper[StatGenerated] with IdPK {
> > > def getSingleton = StatGenerated
> > > object errors extends MappedLong(this)
> > > object hits extends MappedLong(this)
> > > object AB extends MappedLong(this)
> > > }
> >
> > > object StatGenerated extends StatGenerated with LongKeyedMetaMapper
> > > [StatGenerated] {
> > > override def fieldOrder = List(errors, hits)
> > > }
> >
> > > class Statistics extends StatGenerated {
> > > def GetBattingAverage(id : Long) : float = {
> > > val stat = Stat.findByKey(id)
> > > stat.hits/stat.AB
> > > }
> > > }
> >
> > > Now what I would like to do is work with the Statistics class as my
> > > ORM object...
> > > But I believe everything that is ORM related is actually of type
> > > StatGenerated rather than Statistics. i.e. findByKey will return me a
> > > StatGenerated rather than a Statistics class. Is there any clever way
> > > around this that I am missing without either modifying the generated
> > > class or duplicating code?
>
> >
>
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
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