时间戳

首页 > 解决方案 > Scala-Cats :- 是否可以合并来自不同 NonEmptyLists 的错误？

scala - Scala-Cats :- 是否可以合并来自不同 NonEmptyLists 的错误？

问题描述

是否有可能使用多个变量组合不同的错误NonEmptyList

type ValidationResult[A] = ValidatedNel[String, A]

def throwErrorsWhenNumberIsLessThan6(x:Int):ValidationResult[Int] = if(x<6) s"$x !> 6".invalidNel else (x+6).validNel

def throwErrorsWhenStringLengthIsLessThan6(x:String):ValidationResult[String] = if(x.length<6) s"$x length > 6".invalidNel else (x+" OK!!! ").validNel

val ints = Range.apply(1,10).map(throwErrorsWhenNumberIsLessThan6).toList

val strings = Range.apply(1,10).map(e => throwErrorsWhenStringLengthIsLessThan6(e.toString)).toList

有没有办法结合所有可用的错误ints和strings？

假设intsand将strings在NonEmptyList.

标签： scalascala-cats

解决方案

这对我有用

type ValidationResult[A] = ValidatedNel[String, A]
def throwErrorsWhenNumberIsLessThan6(x:Int):ValidationResult[Int] = if(x<6) s"$x !> 6".invalidNel else (x+6).validNel
def throwErrorsWhenStringLengthIsLessThan6(x:String):ValidationResult[String] = if(x.length<6) s"$x length > 6".invalidNel else (x+" OK!!! ").validNel

val ints = Range.apply(0,2).map(throwErrorsWhenNumberIsLessThan6).toList
val strings = Range.apply(0,2).map(e => throwErrorsWhenStringLengthIsLessThan6(e.toString+"KK")).toList

ints.filter(_.isInvalid).:::(strings.filter(_.isInvalid))
//List(Invalid(NonEmptyList(0KK length > 6)), Invalid(NonEmptyList(1KK length > 6)), Invalid(NonEmptyList(0 !> 6)), Invalid(NonEmptyList(1 !> 6)))

推荐阅读