Custom validation rule for a field

[howdu]

It would be great to have a way of setting custom validation rules to a field without overwriting the controller. https://voyager-docs.devdojo.com/bread/introduction#validation

E.g

{
    "validation": {
        "rule": "required",
        "custom_rule": "App\Rules\DateWithinFinancialYear|App\Rules\SlugUniqueForCategory",
        "messages": {
            "required": "This :attribute field is a must."
        }
    }
}

[MrCrayon]

There is no need to override Controller, create a custom rule and apply it like any other rule.

[howdu]

Please could you give example because I can only make it work with default laravel validation.

E.g using a custom validation rule

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class DateWithinFinancialYear implements Rule
{
    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        return false; // always fail for testing
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'The :attribute must be ....';
    }
}

Update the field details:

{
    "validation": {
        "rule": "required|DateWithinFinancialYear",
        "messages": {
            "required": "This :attribute field is a must."
        }
    }
}

Throws error: Method Illuminate\Validation\Validator::validateDateWithinFinancialYear does not exist.

[MrCrayon]

// in Provider boot method

//Custom validation rule
Validator::extend('date_with_financial_year', function ($attribute, $value, $parameters, $validator) {
    //your checks
}, 'custom message');

{
  "validation": {
    "rule": "required|date_with_financial_year",
  }
}

[howdu]

Awesome thanks that's exactly what I needed. It's not in the laravel 8 documentation but exists in the older ones so might be worth adding it into the voyager documentation.

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