oneOf inside another oneOf

I’m getting this error:

Cannot match against ‘undefined’ or ‘null’. (from /express-validator/check/select-fields.js:71:33)

When using a oneOf inside another one. Like this:

oneOf([
  [
    check('role').equals('student'),
    check('student.school.id', 'Invalid student.school.id.').isInt(),
  ], [
    check('role').equals('teacher'),
    check('teacher.school.id', 'Invalid teacher.school.id.').isInt(),
    oneOf([
      [
        check('teacher.classes').exists(),
        check('teacher.classes.*.id', 'Invalid teacher.classes.*.id').isInt(),
      ],
      [/* Do nothing (no classes found) */]
    ])
  ]
])

If a remove the oneOf within the parent one, it works. Maybe I’m doing something wrong? I just want to check the classes (array of objects) in case they are found.

I’m using version 4.3.0.

[gustavohenke]

Right. There’s no difference between the 2 snippets, they work exactly the same.

Anyway, a new major release is coming soon, and conditional validation will be available in the package.

[emipc]

Ok, then I’ll stick with V3 as it handles this kind of situation easily.