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
<[email protected]>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 [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~----------~----~----~----~------~----~------~--~---
