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writing a rule using multiple fields

See original GitHub issue

Given the following data structure

  case class Family(name: String, children: Set[Child], mainPet: Pet, otherPets: Seq[Pet])
  object Family {
    implicit val validations: Validator[Family] = Validator
      .rule[String](, _.nonEmpty, "is required")

Is there a way to write a rule that combines more than one field? E.g.

  • mainPet can’t be the same as one of the otherPets
  • mainPet name can’t be the same as one of the childrens’ name

I tried writing a selector that would map a tuple, e.g. Family => (String, Pet), but it looks like the macro won’t support that.

val familyNameCantBeSameAsMainPet = (pair: (String, Pet)) => pair._1 !=
val nameAndMainPetSelector = (family: Family) => (, family.mainPet)
.rule[(String, Pet)](nameAndMainPetSelector, familyNameCantBeSameAsMainPet, "testing tuple selector")

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:6 (3 by maintainers)

github_iconTop GitHub Comments

andyczerwonkacommented, Nov 3, 2020

We can throw this one on the roadmap as a feature request for custom naming. Closing.

krzemincommented, Nov 2, 2020

Well, empty path here means root path. So in this context I believe it’s correct as for such validation the problem is due to invalid relationship between different field values.

When you have Family nested (or in a collection), you get your family-level errors prefixed with non empty path.

If you really need to, you can assign this error to a single specific field (name? using 3 arg rule). Other options are not supported currently.

Read more comments on GitHub >

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