如何在嵌套表单的多字段约束中命名字段

Question

这是一个关于复杂表单的问题的后续:如何使用表单在Play框架(2.4.0)中获得子记录(case class) ID

lazy val aForm = Form(
mapping(
  "ID" -> ignored(id),
  "firstName" -> nonEmptyText,
  "lastName" -> nonEmptyText,
  "listOfEmails" -> mapping(
     "ID" -> ignored(emailID),
     "email" -> email,
     "userID" -> ignored(id),
     "emailTypeID" -> longNumber)
     (UserEmail.apply)(UserEmail.unapply) verifying someConstraint,
  "statusID" -> ignored(0l),
  "roleID" -> default(longNumber, roleID),
  "timezoneID" -> default(longNumber, timezoneID) 
  (User.apply) 
  (User.unapply)
  )

现在，由于约束是在apply方法之后，我们有转换的case class并访问它的所有字段，因此我们可以编写一个使用任何和所有字段的数据的验证。我不确定我是否真的对此感到满意——为什么要在测试之前转换数据呢?为什么我们不能简单地将手头的数据用于验证过程呢?如果case class本身由于错误的数据或内部验证过程而在创建中有任何异常，它也会出现问题，但这将是一个足够小的角落案例，可以构建一个解决方案-仅用于验证的自定义case class。

   def someConstraint: Constraint[UserEmail] =  Constraint("constraints.unique")({
     userEmail =>
          match doStuff(userEmail.ID, userEmail.email, userEmail. emailTypeID) {
          case BAD => Invalid(Seq(ValidationError("error.unique.email.required")))
          case GOOD => Valid
          }
       }
    |)

为伪代码感到抱歉，但希望您能了解验证过程中发生的事情的基本概念。我们取几个字段，并处理其中包含的数据，以进行验证判断调用。

事情是这样的。

在HTML输出中，嵌套的类字段必须被称为:listOfEmails[x].ID和listOfEmails[x].email等，以便Play框架在POST上正确捕获它们——https://www.playframework.com/documentation/2.4.0/ScalaForms

然而，约束过程返回listOfEmails[x]作为错误键的字段名，因此它不会出现在html模板上，因为该键不匹配任何内容。

那么如何重命名错误字段键(假设这是这里的正确答案)或者更好的问题是如何端到端地执行此过程?

是的，我们可以使用全局错误，但是在一个大而复杂的表单上，我们希望让错误尽可能接近解决方案，以便用户的眼球能够快速拾取并向前移动。

Answer 1

object TestSeq extends App {
//case class Email(email: String)
  case class Email(email: String,f1:String,f2:String,f3:String,f4:String,f5:String,f6:String,f7:String,f8:String,f9:String)
  case class User(name: String, emails: Seq[Email], addr: String)
  import play.api.data.Forms._
  import play.api.data._
  import play.api.data.validation._
  val someConstraint: Constraint[Email] =
    Constraint("constraints.unique"){  email =>
      if(email.email.contains('@')) Valid
      else Invalid(ValidationError("error.unique.email.required"))
    }
  val form = Form(
    mapping(
      "name" -> text,
      "emails" -> seq(mapping(
        "email" -> nonEmptyText,
        "f1" -> text,
        "f2" -> text,
        "f3" -> text,
        "f4" -> text,
        "f5" -> text,
        "f6" -> text,
        "f7" -> text,
        "f8" -> text,
        "f9" -> text
      )(Email.apply)(Email.unapply) verifying someConstraint),
      "addr" -> text
    )(User.apply)(User.unapply)
  )
  val data = Map[String, String](
    "name" -> "xx",
    "emails[0].email" -> "[e-mail]",
    "emails[0].f1" -> "0f1",
    "emails[0].f2" -> "0f2",
    "emails[0].f3" -> "0f3",
    "emails[0].f4" -> "0f4",
    "emails[0].f5" -> "0f5",
    "emails[0].f6" -> "0f6",
    "emails[0].f7" -> "0f7",
    "emails[0].f8" -> "0f8",
//    "emails[0].f9" -> "0f9",
    "emails[1].email" -> "",
    "emails[1].f1" -> "1f1",
    "emails[1].f2" -> "1f2",
    "emails[1].f3" -> "1f3",
    "emails[1].f4" -> "1f4",
    "emails[1].f5" -> "1f5",
    "emails[1].f6" -> "1f6",
    "emails[1].f7" -> "1f7",
    "emails[1].f8" -> "1f8",
    "emails[1].f9" -> "1f9",
    "emails[2].email" -> "a2xx.com",
    "emails[2].f1" -> "2f1",
    "emails[2].f2" -> "2f2",
    "emails[2].f3" -> "2f3",
    "emails[2].f4" -> "2f4",
    "emails[2].f5" -> "2f5",
    "emails[2].f6" -> "2f6",
    "emails[2].f7" -> "2f7",
    "emails[2].f8" -> "2f8",
    "emails[2].f9" -> "2f9",
    "addr" -> "dalian"
  )
  val user = form.bind(data).fold(
    ef => ef.errors.foreach(println _) ,
    contact =>println(contact)
  )
  /* ===== output =====
  FormError(emails[0].f9,List(error.required),List())
  FormError(emails[1].email,List(error.required),WrappedArray())
  FormError(emails[2],List(error.unique.email.required),WrappedArray())
  user: Unit = ()
  */
}