Guys I'm trying to use arrow to do validations. I ...

# arrow

[vers85]

Guys I'm trying to use arrow to do validations. I have 14 parameters that i need to validate in order to create an instance of a data class, but zipOrAccumulate only takes up to 9. The requirement is that it validates them all and lists all the errors. What's the correct approach?

[Johann Pardanaud]

I know you might want to stick to Arrow. But if you have a complex use case, you might consider Akkurate, a validation library I'm maintaining. 🙂

With it, you can easily accumulate the errors, and it has an integration with Arrow's typed errors.

Feel free to have a look!

[Geert]

There is also a PR for an “accumulate” dsl: https://github.com/arrow-kt/arrow/pull/3436

[Gemy]

14 parameters?
Maybe split these validation across your layers and/or services?

[vers85]

14 parameters coz its just one domain object that i build from the excel workbook. Each sheet contains data for one object and from the domain perspective it's either all properly parsed and returns a list of objects or it's malformed and user needs to know which sheet contains what problems. Doesnt make sense to me to validate it multiple times 🙂

[simon.vergauwen]

Any feedback on this PR would be awesome 🙏
https://github.com/arrow-kt/arrow/pull/3436

In the meanwhile you can work around it using Tuple as well.

zipOrAccumulate(
  zipOrAccumulate(
    /* 9 lambdas */,
    ::Tuple9
  ),
  zipOrAccumulate(
    /* 5 lambdas */,
    ::Tuple5
  )
) { (a, b, c, d, ..), (a, b, ...) -> }

[vers85]

Thanks Simon! Appreciate your work!

[Gemy]

Simon is gold to humanity