Hi all,
I'm attempting to persist a Mapper used to join two tables.
java.lang.NullPointerException: Trying to open an empty Box
at net.liftweb.util.EmptyBox.open_$bang(Box.scala:370)
at net.liftweb.util.EmptyBox.open_$bang(Box.scala:366)
at net.liftweb.mapper.MetaMapper$$anonfun$12.apply(MetaMapper.scala:
583)
at net.liftweb.mapper.MetaMapper$$anonfun$12.apply(MetaMapper.scala:
578)
at net.liftweb.mapper.DB$.use(DB.scala:305)
at net.liftweb.mapper.MetaMapper$class.save(MetaMapper.scala:577)
The empty box is in the update statement, which confuses me as I
should be performing an insert.( from MetaMapper )
val ret: Boolean = DB.prepareStatement("UPDATE
"+dbTableName+" SET "+whatToSet(toSave)+" WHERE "+indexMap.open_! +"
= ?", conn)
I am assuming it is something to do with my understand of how to use a
non-keyed Mapper.
The exception is thrown when save is called in the join function.
class AB extends Mapper[AB] {
def getSingleton = AB
object A extends MappedLongForeignKey(this, A) { override def
dbColumnName = "a_Bs_id" }
object B extends MappedLongForeignKey(this, B) { override def
dbColumnName = "B_id" }
object index extends MappedInt(this) { override def dbColumnName =
"Bs_idx" }
}
object AB extends AB with MetaMapper[AB]
{
override def dbTableName = "A_B"
def join (a : A, b : B):Boolean = {
val list = AB.findAll(By(AB.a,a))
val i = list.isEmpty match {
case true => 0
case false => list.size
}
this.create.A(a).B(b).index(i).save
}
}
Any pointers would be appreciated, I can't change the data structure
as the table is used by other applications.
Jono
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