Validating a dynamic field

[yarapolana]

I was looking for ways to authenticate a user with both email and username and came across this.

I was wondering if there is a possibility to validate this field?
Something similar to this:

  emailOrUsername: schema.string({}, [rules.email()] || schema.string({}) 
  // this field should either email or username but the validation falls to email

[thetutlage]

How do you validate username? Do you some regex for that or does any string is a valid username in your app?

[yarapolana]

my username is something like this schema.string({}, [rules.regex(/^[a-zA-Z0-9_-]{2,80}$/)])

[thetutlage]

Okay. So yes, there is no way to define OR conditions when using rules. It is an intentional limitation, otherwise it makes composing a schema too complicated. A practical option is to define your own rule called uid, which performs the OR check internally. Here's a guide on creating custom validator rules. https://preview.adonisjs.com/guides/validator/custom-rules.