如何使用play framework case类绑定确认密码字段？

case class RegistrationForm(username: String, password: String, confirmPassword: String)

def submitForm = Action { implicit request =>
  val form = Form(mapping(
    "username" -> nonEmptyText,
    "password" -> nonEmptyText,
    "confirmPassword" -> nonEmptyText
  )(RegistrationForm.apply)(RegistrationForm.unapply))

  form.bindFromRequest.fold(
    formWithErrors => {
      // 处理表单验证失败的情况
      BadRequest(views.html.registration(formWithErrors))
    },
    formData => {
      // 处理表单验证成功的情况
      if (formData.password == formData.confirmPassword) {
        // 密码和确认密码匹配，可以进行后续操作
        // ...
        Ok("Registration successful!")
      } else {
        // 密码和确认密码不匹配，返回错误信息
        val formWithErrors = form.withError("confirmPassword", "Passwords do not match")
        BadRequest(views.html.registration(formWithErrors))
      }
    }
  )
}

@helper.form(action = routes.YourController.submitForm()) {
  @helper.inputText(registrationForm("username"))
  @helper.inputPassword(registrationForm("password"))
  @helper.inputPassword(registrationForm("confirmPassword"))
  <input type="submit" value="Register">
}