forms - 如何在 Play 中同时验证多个表单字段？

Question

所以我有一个表单对象:

  object RegisterForm {
   case class registerFormData(
      name: String,
      email: String,
      repeatemail: String,
      password: String,
      repeatpassword: String,
      timezone: Option[Int],
      dob: Int,
      accept: Boolean
  )
  val registerForm: Form[registerFormData] = Form(
    mapping(
      "name" -> nonEmptyText,
      "email" -> nonEmptyText,
      "repeatemail" -> nonEmptyText,
      "password" -> nonEmptyText,
      "repeatpassword" -> nonEmptyText,
      "timezone" -> optional(number),
      "dob" -> number,
      "accept" -> checked("Please accept the terms and conditions.")
    )(registerFormData.apply)(registerFormData.unapply)
  )
}

我可以像在 Java 中的 Play 中一样同时验证多个字段吗？

例如，我可以验证密码和重复密码是否相等，检查以确保用户名未被占用，然后发回显示两个错误的表单？

Answer 1

像这样会更好:

case class User(
   name: String,
   email: String,
   password: String,
   timezone: Option[Int],
   dob: Int,
   accept: Boolean
)

val registerForm: Form[User] = Form(
    mapping(
      "name" -> nonEmptyText,
      "email" -> tuple(
          "main" -> nonEmptyText,
          "confirm" -> nonEmptyText
      ).verifying(
           "Emails don't match", email => email._1 == email._2
      ).transform[String](
          email => email._1,      // Transform to a single field
          email => (email, email) // Reverse transform from a single field to multiple
      ),
      "password" -> tuple(
          "main" -> nonEmptyText,
          "confirm" -> nonEmptyText
      ).verifying(
           "Passwords don't match", password => password._1 == password._2
      ).transform[String](
          password => password._1,
          password => ("", "")
      ),
      "timezone" -> optional(number),
      "dob" -> number,
      "accept" -> checked("Please accept the terms and conditions.")
    )(User.apply)(User.unapply)
)

我个人还会从 Form 本身中删除 accept，并在选中“accept”复选框之前阻止用户使用提交按钮。使用这种方法，您可以减少引入案例类的垃圾量，并且根本不需要单独的案例类。 HTML 中的表单字段将如下所示:

Email: <input type="text" name="email.main">
Confirm Email: <input type="text" name="email.confirm">

您还可以使用验证在表单中检查用户名或电子邮件地址是否已被使用，但我会将其保存到之后 表单已成功绑定(bind)。

如果您有像 User.findByEmail(string) 这样返回 Option[User] 的函数，您可以添加到 Form< 中的电子邮件字段:

.verifying("Email address is already in use", email => User.findByEmail(email).isEmpty)