Scala Play表单验证:一个案例类使用不同的表单-可以吗? [英] Scala Play form validation: different forms for one case class - is it possible?

问题描述

我正在寻找一种对一个案例类使用两种不同形式的方法.我试图用其他构造函数来做到这一点，但是失败了.看一下代码片段:

I'm looking for a way to use two different forms for one case class. I was trying to do that with additional constructor, but failed with that. Look at the code snippet:

case class LoginDetails(password: String, field3: Option[Int], field4: String)

case class User(username: String, loginDetails: LoginDetails) {
   def this(username: String, password: String, field3: Option[Int], field4: String) = this(username, LoginDetails(password, field3, field4))
// some logic inside
    }

val loginDetailsForm = Form(
 mapping(
   "password" -> text,
   "field3" -> optional(number),
   "field4" -> text
 )(LoginDetails.apply)(LoginDetails.unapply))

val oldForm = Form(
 mapping(
   "username" -> email,
   "password" -> text,
   "field3" -> optional(number),
   "field4" -> text
 )(User.apply)(User.unapply))

val newForm = Form(
     mapping(
       "username" -> email,
       "loginDetails" -> loginDetailsForm.mapping
     )(User.apply)(User.unapply))

我想做的是支持两个API(新旧API)，但是如果我要拥有同一个case类的两个副本，那么我将不得不在其余的许多地方重复编写代码逻辑代码.如果有办法做到这一点?

What I'm trying to do is to support two API's (new and old one), but if I will have two copies of the same case class, I will have to make code logic duplicates in many many places in the rest of the code. If there is a way to do that?

当然给定的代码不起作用，并且像一个例子一样使用.

Of course given code doesn't work and is used like an example.

谢谢！

推荐答案

您可以尝试将方法applyOld和unapplyOld添加到伴随对象，如下所示:

You could try to add methods applyOld and unapplyOld to companion object like this:

case class User(username: String, loginDetails: LoginDetails)
object User {
  def applyOld(username: String, password: String, field3: Option[Int], field4: String) = new User(username, LoginDetails(password, field3, field4))
  def unapplyOld(u: User): Option[(String, String, Option[Int], String)] =
    Some((u.username, u.loginDetails.password,  u.loginDetails.field3,  u.loginDetails.field4))
}

您只需要方法(String, String, Option[Int], String) => User和User => Option[(String, String, Option[Int], String)]，您可以将它们放置在任意位置.例如，您可以使用方法apply和unapply创建对象UserOld.

You just need methods (String, String, Option[Int], String) => User and User => Option[(String, String, Option[Int], String)], you could place them anywhere you like. For instance you could create object UserOld with methods apply and unapply.

用法:

val oldForm = Form(
 mapping(
   "username" -> email,
   "password" -> text,
   "field3" -> optional(number),
   "field4" -> text
 )(User.applyOld)(User.unapplyOld))

val newForm = Form(
     mapping(
       "username" -> email,
       "loginDetails" -> loginDetailsForm.mapping
     )(User.apply)(User.unapply))

这篇关于Scala Play表单验证:一个案例类使用不同的表单-可以吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！