如何在 Scala 中为案例类参数生成值 [英] How to generate values for case class parameters in scala

问题描述

我有一个包含 250 个字段的案例类:

I have a case class with 250 fields:

case class Data(field1:String, field2:Int, .. )

有没有办法使用scala检查为其参数生成值

Is there a way to use scala check to generate values for its parameter

我看过的不相关的问题:
如何使用宏为 Scala 案例类中的每个字段生成案例对象?
在 Scala 中动态生成案例类
创建任意实例对于在 ScalaCheck 中包含Numeric"的案例类?

Irrelevant questions I've looked at:
How to generate case objects for every field in a Scala case class using macro?
Dynamically generate case class in Scala
Create an Arbitrary instance for a case class that holds a `Numeric` in ScalaCheck?

推荐答案

使用 scalacheck-shapeless:

import org.scalacheck.Shapeless._
import org.scalacheck.Arbitrary._

implicitly[Arbitrary[Data]]

以上代码段执行以下操作:

The above snippet does the following:

• 通过隐式宏调用 shapeless.Generic[Data] 将您的案例类转换为 shapeless.HList
• 递归获取每个字段的所有Arbitrary[String]、Arbitrary[Int]等
• 将所有这些组装到一个新的 Arbitrary[Data] 实例中

• Summon a shapeless.Generic[Data] via implicit macro to transform you case class into a shapeless.HList
• Recursively obtain all Arbitrary[String], Arbitrary[Int] and so on for every field
• Assemble all that into a new Arbitrary[Data] instance

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