I have an object type representing a threaded comment that I want to
organize into trees - what's the best way to represent this
relationship with Mapper? My naive idea is to do something like:
class Comment extends LongKeyedMapper[Comment] with IdPK {
...
object parentComment extends MappedLongForeignKey(this, Comment) {
override def dbColumnName = "parent_comment_id"
override def defaultValue = -1
}
...
def getParentComment():Box[Comment] = {
if(this.parentComment.is == -1) {
Empty
}
else {
Comment.find(By(Comment.id, this.parentComment))
}
}
}
Is there a way to do this more directly so that Comment.parentComment
just gives me something I can feed into type matching rather tahn
doing the explicit check against -1 in a wrapper funciton?
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