I got an compile error when calling validate method of Mapper trait.
That is:
[INFO] D:\dev\lift\sample\src\main\scala\mydomain\snippet
\CategoryCrud.scala:48
: error: erroneous reference to overloaded definition,
[INFO] most specific definition is: method validate in trait Mapper of
type => L
ist[net.liftweb.http.FieldError],
[INFO] yet alternative definition method validate in trait
MetaMapper of type
(jp.co.mss.model.Category)List[net.liftweb.http.FieldError]
[INFO] is defined in a subclass
[INFO] private def saveCategory(category: Category) =
category.validate match
{
[INFO]
The code that the error above occurred is below:
<Category.scala>:
object CategoryMeta extends Category with KeyedMetaMapper
[Long,Category]{
override def dbTableName = "category"
override def fieldOrder = id :: parent :: name :: Nil
}
class Category extends KeyedMapper[Long,Category] with CRUDify
[Long,Category]{
def getSingleton = CategoryMeta // Metaオブジェクト
def primaryKeyField = id // 主キーの設定
object id extends MappedLongIndex(this)
object parent extends MappedLongForeignKey(this, CategoryMeta) {
override def asHtml = this.obj match {
case Full(c) => Text(c.name.is)
case Empty => Text("N/A")
case Failure(msg, _, _) => Text(msg)
}
override def validSelectValues: Box[List[(Long, String)]] =
Full(CategoryMeta.findAll().map(c => (c.id.is, c.name.is)))
}
object name extends MappedString(this, 128)
}
o
<CategoryCrud.scala>:
...
private def saveCategory(category: Category) = category.validate
match {
case Nil => category.save(); redirectTo("/category/index.html")
case x => error(x.toString); selectedCategory(Full(category))
}
Other method such as "save" and "delete_!" result in the same error
I think that "category" is an instance of Mapper trait, and not an
instance of MetaMapper.
If an instance of Mapper implicitly wolud be converted to MetaMapper
and that occurred the error, every people using Mapper would encounter
the same situation
So, I'm wondering why this error happens. and I think I must have made
some mistake.
I use lift0.10 and Scala2.7.3.
Could anyone suggest?
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