从下面的 Lift-Web Mapper 模型中,我如何访问 AssignmentformLink 下的字段?
object TForm extends TForm with LongKeyedMetaMapper[TForm]
class TForm extends LongKeyedMapper[TForm] with IdPK with ManyToMany {
def getSingleton = TForm
object label extends MappedString(this, 40)
object pattern extends MappedString(this, 200)
object assignments extends MappedManyToMany(
AssignmentformLink, AssignmentformLink.assignment, AssignmentformLink.form, TForm)
}
object AssignmentformLink extends AssignmentformLink with LongKeyedMetaMapper[AssignmentformLink] {
override def dbIndexes = Index(form, assignment) :: super.dbIndexes
}
class AssignmentformLink extends LongKeyedMapper[AssignmentformLink] with IdPK {
def getSingleton = AssignmentformLink
object form extends MappedLongForeignKey(this, TForm)
object assignment extends MappedLongForeignKey(this, Assignment)
object order extends MappedInt(this)
object readonly extends MappedBoolean(this)
object required extends MappedBoolean(this)
object visible extends MappedBoolean(this)
}
object Assignment extends Assignment with LongKeyedMetaMapper[Assignment]
class Assignment extends LongKeyedMapper[Assignment] with IdPK with ManyToMany {
def getSingleton = Assignment
object id_parent extends MappedLong(this)
object label extends MappedString(this, 40)
object order extends MappedInt(this)
object guard extends MappedString(this, 200)
object forms extends MappedManyToMany(
AssignmentformLink, AssignmentformLink.assignment, AssignmentformLink.form, TForm)
}
要获得一个 assignmentmet 和链接到它的表单,您可以这样做:
val assignments = Assignments.find(By(Assignment.id, 123))
assignments match {
case Full(as) => {
val forms = as.forms
.....
但我不知道如何导航order, readonly, required...
到AssignmentformLink
.
我意识到我可以手动搜索链接,即。AssignmentformLink.find(By(form...),By(assignment...))
,但这会导致代码效率低下,并且真的错过了使用对象的重点。
我需要能够从表单导航到链接表的字段。