具有替代方案的重载方法值过滤器：在 play-framework 2.6 中

Question

我从 play 2.4 升级到 play 2.6 我遇到了这个编译时错误

[error] myproject/app/models/jsonparsing/DirectUserSignUpJsonValidation.scala:27: overloaded method value filter with alternatives:
[error]   (error: play.api.libs.json.JsonValidationError)(f: String => Boolean)play.api.libs.json.Reads[String] <and>
[error]   (f: String => Boolean)play.api.libs.json.Reads[String]
[error]  cannot be applied to (play.api.data.validation.ValidationError)
[error]       filter(ValidationError("Password length is less than 8"))(_.length >= 8).

这是代码

case class DirectUserSignUpValidation(firstName: String,
                                      lastName: String,
                                      email: String,
                                      password: String) extends Serializable

object DirectUserSignUpValidation {
  var validationErrorMsg=""
  implicit val readDirectUser: Reads[DirectUserSignUpValidation] = (
  (JsPath \ "firstName").read(minLength[String](1)) and
    (JsPath \ "lastName").read(minLength[String](1)) and
    (JsPath \ "email").read(email) and
    (JsPath \ "password").read[String].
      filter(ValidationError("Password length is less than 8"))(_.length >= 8).  
      filterNot(ValidationError("Password is all numbers"))(_.forall(_.isDigit)).
      filterNot(ValidationError("Password is all letters"))(_.forall(_.isLetter))
    )(DirectUserSignUpValidation.apply _)
}

Answer 1

新的 play-json 库现在可以与 JsonValidationError 一起使用，而您使用的是旧的 ValidationError。

具有替代方案的重载方法值过滤器：在 play-framework 2.6 中

overloaded method value filter with alternatives: in play-framework 2.6

scala

playframework

playframework-2.6