我是Lift和scala的新手并尝试做一些事情。 在我想要与电梯创建多态关联的那一刻 映射器。
这里有一个例子：
我想创建一个类Entry，它可以是任何一个n中的条目 ListX对象。我怎样才能让父母和条目成为现实 多态？ 是否有通用的方法来与这些多态关联 OneToMany＆amp; ManyToMany在两个方向？
class Entry extends BaseModel[Entry] {
def getSingleton = Entry
object parent extends MappedBase(this, AnyList)
}
object Entry extends Entry with LongKeyedMetaMapper[Entry] {
}
class ListA extends BaseModel[ListA] with OneToMany[Long, ListA] {
def getSingleton = ListA
object entries extends MappedOneToMany(Entry, Entry.parent)
}
object ListA extends ListA with LongKeyedMetaMapper[ListA] {
}
class ListB extends BaseModel[ListB] with OneToMany[Long, ListB] {
def getSingleton = ListB
object entries extends MappedOneToMany(Entry, Entry.parent)
}
object ListB extends ListB with LongKeyedMetaMapper[ListB] {
}
class ListC extends BaseModel[ListC] with OneToMany[Long, ListC] {
def getSingleton = ListC
object entries extends MappedOneToMany(Entry, Entry.parent)
}
object ListC extends ListC with LongKeyedMetaMapper[ListC] {
}