As Jorge said, switching to:
override def fieldOrder = List(txtime, amount, summary)
seems to offer enough that the compiler is happy.
On Feb 19, 4:35 am, Jorge Ortiz <jorge.or...@gmail.com> wrote:
> Yup, this is a type inference bug. If I'm not mistaken then
>
> override def fieldOrder: BaseOwnedMappedField[Transaction] = txtime ::
> amount :: summary :: Nil
>
> should also work.
>
> In any case, I'd probably just stick with the List(...) syntax.
>
> --j
>
> On Wed, Feb 18, 2009 at 10:23 PM, Derek Chen-Becker
> <dchenbec...@gmail.com>wrote:
>
> > 0.11-SNAPSHOT, and I'm writing up some example code for the book. I have
> > the following class/object:
>
> > class Transaction extends LongKeyedMapper[Transaction] with IdPK {
> > def getSingleton = Transaction
>
> > object account extends MappedLongForeignKey(this, Account) {
> > override def dbIndexed_? = true
> > }
>
> > object txtime extends MappedDateTime(this)
>
> > // The amount has up to 16 digits and 2 decimal places
> > object amount extends MappedDecimal(this, MathContext.DECIMAL64, 2)
>
> > // Holds a brief description of the transaction
> > object summary extends MappedString(this, 100)
>
> > object notes extends MappedTextarea(this, 1000) {
> > override def textareaCols = 60
> > override def textareaRows = 8
> > }
>
> > def tags = TransactionTag.findAll(By(TransactionTag.transaction, this.id
> > ))
> > }
>
> > object Transaction extends Transaction with
> > LongKeyedMetaMapper[Transaction] {
> > override def fieldOrder = txtime :: amount :: summary :: Nil
> > }
>
> > The compile error I get is:
>
> > [WARNING]
> > /home/software/pocketchangeapp/PocketChange/src/main/scala/com/pocketchangeapp/model/Transaction.scala:35:
> > error: inferred type arguments [net.liftweb.mapper.MappedField[_ >: _1 with
> > java.util.Date <: java.io.Serializable,
> > com.pocketchangeapp.model.Transaction]] do not conform to method ::'s type
> > parameter bounds [B >: net.liftweb.mapper.MappedField[_ >: String with
> > BigDecimal <: java.io.Serializable,
> > com.pocketchangeapp.model.Transaction]{def jdbcFriendly(String):
> > java.io.Serializable}]
> > [WARNING] override def fieldOrder = txtime :: amount :: summary :: Nil
> > [WARNING] ^
> > [WARNING] one error found
>
> > If I remove the "summary" element from the fieldOrder list then it compiles
> > fine. Likewise, if I remove txtime and put summary and notes into the list
> > it compiles fine. I'm trying to get my head around all of the nested type
> > bounds in the error message but I'm not seeing anything obvious other than
> > the weird "String with BigDecimal" bound. I tried using an explicit type for
> > fieldOrder but that doesn't work either.
>
> > I finally tried changing fieldOrder to:
>
> > override def fieldOrder = List(txtime, amount, summary, notes)
>
> > That compiles fine. Have I found a type inferencing bug, or have I just
> > done something incredibly stupid somewhere? Feel free to critique the class,
> > too.
>
> > Thanks,
>
> > Derek
>
>
--~--~---------~--~----~------------~-------~--~----~
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
-~----------~----~----~----~------~----~------~--~---
