Sorry it took so long to get to this... my inbox keeps growing... sigh.
Anyway, Order.scala: 64 should be:
def currentCost = Order.this.lots *
(Order.this.marketPlace.obj.map(_.lotValue.is) openOr 0 )
The marketplace field is a foreign key reference... so you have to get the
row that's represented by the foreign key (.obj) which is a Box[MarketPlace]
and then get the lotValue field from the marketplace.
I'm enclosing the revised (compiling) files.
Thanks,
David
On Sun, Jul 5, 2009 at 6:31 AM, Tobias Daub <[email protected]> wrote:
> here are the two files, thanks!
> > Send me the file and I'll debug it.
> >
> > On Fri, Jul 3, 2009 at 3:06 AM, Tobias Daub <[email protected]
> > <mailto:[email protected]>> wrote:
> >
> >
> > Thanks Dave, but still getting this error:
> >
> >
> /home/wacky/NetBeansProjects/virtualMarket/src/main/scala/org/tobster/model/Order.scala:51:
> > error: value lotValue is not a member of Long
> > override def _toForm = Full(<p>{Order.this.lots *
> > Order.this.marketPlace.lotValue}</p>)
> >
> >
> > What is the explanation for this behavior?
> >
> > thanks
> > >
> > >
> > > On Sun, Jun 21, 2009 at 6:38 AM, Tobias Daub
> > <[email protected] <mailto:[email protected]>
> > > <mailto:[email protected] <mailto:[email protected]>>>
> wrote:
> > >
> > >
> > > I'm stucked again with the simple things....
> > >
> > > I've a trait that extends BaseLongKeyedMapper and I wanna
> > add a field
> > > (currentCost) that does some calculation. Nothing special.
> > Here's
> > > the code:
> > >
> > > /*
> > > * Order.scala
> > > *
> > > * To change this template, choose Tools | Template Manager
> > > * and open the template in the editor.
> > > */
> > >
> > > package org.tobster.model
> > >
> > > import net.liftweb._
> > > import mapper._
> > > import http._
> > > import SHtml._
> > > import util._
> > > import model._
> > >
> > > /* Describes a general order. */
> > > trait Order extends BaseLongKeyedMapper{
> > >
> > > /* The number of lots this order has */
> > > object lots extends MappedInt(this.asInstanceOf[MapperType])
> > >
> > > /* The person who owns the order */
> > > object owner extends
> > > MappedLongForeignKey(this.asInstanceOf[MapperType], User){
> > >
> > > // hides this field in the CRUDify list/create forms
> > > override def dbDisplay_? = false
> > >
> > > //set the default value to the current logged in user
> (at
> > > creation time)
> > > override def defaultValue =
> > User.currentUser.map(_.id.is <http://id.is>
> > > <http://id.is>) openOr 0L
> > > }
> > >
> > > /* The market place where the order belongs to */
> > > object marketPlace extends
> > > MappedLongForeignKey(this.asInstanceOf[MapperType],
> > > MarketPlaceMetaObj){
> > > override def _toForm =
> Full(SHtml.selectObj[MarketPlace](
> > >
> > MarketPlaceMetaObj.findAll.map(mp
> > > => (mp, mp.name.is <http://mp.name.is> <http://mp.name.is>)),
> > > obj,
> > > (mp: MarketPlace) =>
> > apply(mp)))
> > > }
> > >
> > > /* The basic trade types are: BUY and SELL */
> > > object tradeType extends
> > > MappedLongForeignKey(this.asInstanceOf[MapperType],
> > TradeTypeMetaObj){
> > > override def _toForm = Full(SHtml.selectObj[TradeType](
> > > TradeTypeMetaObj.findAll.map(t => (t,
> > t.name.is <http://t.name.is>
> > > <http://t.name.is>)),
> > > obj,
> > > (t: TradeType) => apply(t)))
> > > }
> > >
> > >
> > > object currentCost extends
> > > MappedInt(this.asInstanceOf[MapperType]){
> > > override def _toForm = Full(<p>{this.lots *
> > > this.marketPlace.lotValue}</p>)
> > >
> > >
> > >
> > > Try:
> > > override def _toForm = Full(<p>{Order.this.lots *
> > > Order.this.marketPlace.lotValue}</p>)
> > >
> > >
> > >
> > >
> > > }
> > >
> > > }
> > >
> > > I get the following compiler error:
> > >
> > > [WARNING]
> > >
> >
> /home/wacky/workspace_VirtuelleBoerse/virtualMarket/src/main/scala/org/tobster/model/Order.scala:51:
> > > error: value lots is not a member of Int
> > > [WARNING] override def _toForm = Full(<p>{this.lots *
> > > this.marketPlace.lotValue}</p>)
> > > [WARNING] ^
> > > [WARNING] one error found
> > >
> > > The field marketPlace.lotValue is of type MappedInt as well
> > as the
> > > field
> > > lots.
> > >
> > > I tried things like "this.lots.is <http://this.lots.is>
> > <http://this.lots.is>" or
> > > "this.lots.i_is_!" but without
> > > success. I ran out of ideas...
> > >
> > >
> > > thanks.
> > >
> > >
> > >
> > >
> > >
> > > --
> > > 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
> > >
> > > >
> >
> >
> >
> >
> >
> >
> > --
> > 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
> >
> > >
>
>
> >
>
--
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
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/*
* MarketPlace.scala
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package com.liftcode.model
import net.liftweb._
import mapper._
import http._
import SHtml._
import util._
object MarketPlaceMetaObj extends MarketPlace with LongKeyedMetaMapper[MarketPlace]{
override def dbAddTable = Full(populate _)
private def populate {
MarketPlaceMetaObj.create.lotValue(1).currentMarketValue(10000).name("Beginner").save
MarketPlaceMetaObj.create.lotValue(10).currentMarketValue(10000).name("Advanced").save
MarketPlaceMetaObj.create.lotValue(100).currentMarketValue(10000).name("Expert").save
}
}
/* */
class MarketPlace extends LongKeyedMapper[MarketPlace] with IdPK {
def getSingleton = MarketPlaceMetaObj
/* The main purpose of the name is to have something to display. */
object name extends MappedString(this, 50)
/* Every market place has its own lot value that applies to all orders that belong to the market place */
object lotValue extends MappedInt(this)
/* Every market place has an independent "index" that changes every time when two orders meet */
object currentMarketValue extends MappedInt(this)
}
object TradeTypeMetaObj extends TradeType with LongKeyedMetaMapper[TradeType]{
override def dbAddTable = Full(populate _)
private def populate {
MarketPlaceMetaObj.create.lotValue(1).currentMarketValue(10000).name("Beginner").save
MarketPlaceMetaObj.create.lotValue(10).currentMarketValue(10000).name("Advanced").save
MarketPlaceMetaObj.create.lotValue(100).currentMarketValue(10000).name("Expert").save
}
}
/* */
class TradeType extends LongKeyedMapper[TradeType] with IdPK {
def getSingleton = TradeTypeMetaObj
/* The main purpose of the name is to have something to display. */
object name extends MappedString(this, 50)
/* Every market place has its own lot value that applies to all orders that belong to the market place */
object lotValue extends MappedInt(this)
/* Every market place has an independent "index" that changes every time when two orders meet */
object currentMarketValue extends MappedInt(this)
}
/*
* Order.scala
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package com.liftcode.model
import net.liftweb._
import mapper._
import http._
import SHtml._
import util._
import model._
/* Describes a general order. */
trait Order extends BaseLongKeyedMapper{
/* The number of lots this order has */
object lots extends MappedInt(this.asInstanceOf[MapperType])
/* The person who owns the order */
object owner extends MappedLongForeignKey(this.asInstanceOf[MapperType], User){
// hides this field in the CRUDify list/create forms
override def dbDisplay_? = false
//set the default value to the current logged in user (at creation time)
override def defaultValue = User.currentUser.map(_.id.is) openOr 0L
}
/* The market place where the order belongs to.
* Display this field as a drop-down menu, that contains all available market places. */
object marketPlace extends MappedLongForeignKey(this.asInstanceOf[MapperType], MarketPlaceMetaObj){
override def _toForm = Full(SHtml.selectObj[MarketPlace](
MarketPlaceMetaObj.findAll.map(mp => (mp, mp.name.is)),
obj,
(mp: MarketPlace) => apply(mp)))
}
/* The basic trade types are: BUY and SELL.
* Display this field as a drop-down menu, that contains all available trade type. */
object tradeType extends MappedLongForeignKey(this.asInstanceOf[MapperType], TradeTypeMetaObj){
override def _toForm = Full(SHtml.selectObj[TradeType](
TradeTypeMetaObj.findAll.map(t => (t, t.name.is)),
obj,
(t: TradeType) => apply(t)))
}
/*
private def displayAsDropDownMenu[T] =
val tmp = T.toString + "MetaObj"
Full(SHtml.selectObj[T](
tmp.findAll.map(elem => (elem, elem.name.is)),
obj,
(elem: T) => apply(elem)))
*/
/*object currentCost extends MappedInt(this.asInstanceOf[MapperType]){
override def _toForm = Full(<p>{Order.this.lots * Order.this.marketPlace.lotValue}</p>)
}*/
def currentCost = Order.this.lots * (Order.this.marketPlace.obj.map(_.lotValue.is) openOr 0 )
}
