Nested useFieldArray validation validates deleted indices.

[DarryQueen]

Version Number

7.43.9

Codesandbox/Expo snack

https://codesandbox.io/s/modest-pond-l24ue7

Steps to reproduce

1. Notice there are two field top-level array fields (topLevel1 and topLevel2).
2. Each top-level array field has a nested array field (nested1).
3. Delete one of the top-level fields.
4. Click submit.
5. The validation error at the nested array level (`array.${number}.nestedArray`) throws an error, saying the array value is undefined.

Expected behaviour

The validation should succeed (or at least not error).

I believe this is because additional indices are not being accounted for. There are originally 2 array values; I delete one so there should only be 1. The nested validation (`array.${index}.nestedArray`) is validating with field names `array.${0}.nestedArray` and `array.${1}.nestedArray`, and the latter cannot find a value (because it was deleted).

What browsers are you seeing the problem on?

No response

Relevant log output

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[bluebill1049]

resolver: async (data, context, options) => {
  // you can debug your validation schema here
  console.log('formData', data)
  console.log('validation result', await anyResolver(schema)(data, context, options))
  return anyResolver(schema)(data, context, options)
},

please use the above code to bug your issue.

[leapful]

@DarryQueen

Please read carefully the documentation https://react-hook-form.com/api/usefieldarray/

useFieldArray hook does not support dynamic field array name therefore your nested field array.0.nestedArray cannot be found on form field reference and causes undefined data.

[DarryQueen]

What does dynamic name mean? Is this something that can be supported soon? useFieldArray is a really nice and convenient helper, and nested arrays seem like a fairly common use case.

[leapful]

@DarryQueen

Dynamic name is the field array name you used in this file https://codesandbox.io/s/modest-pond-l24ue7?file=/src/NestedFields.tsx . It's currently not supported at this time.