Enum validation with runtime data (VineJS)

[Barbapapazes]

Hello,

My database contains an array of strings: ['JavaScript', 'TypeScript', 'Python'].

I use these data to create dynamic form where strings are the value of an HTML select.

I would use Vine to validate not only that the received data from this dynamic form is a string but also that data is in the database. I was thinking about something like with unique, https://docs.adonisjs.com/guides/validation#passing-metadata-to-validators, but it does not seems to exists for enum.

How could I achieve that? Thanks!

[Barbapapazes]

I need to try this https://vinejs.dev/docs/types/enum#defer-computing-enum-options with a field.meta

[Barbapapazes]

Could be useful to be able to do the same for the maxLength of array

[thetutlage]

Yes, you can either use enum or the in rule. Both support returning runtime values.

Not sure what you mean by "do the same for the maxLength of array". Can you share an example of exactly what you are trying to do?

[Barbapapazes]

For example, I have a form where a user can create dynamic form. This user can create a multi-select and indicate how many answers (max) a user can select. This max value is only known at runtime since it comes from the database.

I was trying to use maxLength with a custom meta input like with enum.

Actually, it's not possible. To solve this, I create a custom dynamic_max_length_rule:

import vine from '@vinejs/vine'
import { FieldContext } from '@vinejs/vine/types'

type Options = {}

/**
 * Validates the length of an array based on the field's meta `maxLength` (runtime).
 */
function dynamicMaxLength(value: unknown, options: Options, field: FieldContext) {
  if (!field.isValid) {
    return
  }

  if ((value as unknown[]).length > field.meta.maxLength) {
    field.report(
      `The {{ field }} must not contain more than ${field.meta.maxLength} items`,
      'dynamicMaxLength',
      field,
      options
    )
  }
}

export const dynamicMaxLengthRule = vine.createRule(dynamicMaxLength)

This works fine ans I was asking if this is something that could be build-in Vine or maybe a little of documentation explaining this?