Create Laravel Eloquent Model with unique field. Unique value is generated random string. Uniqueness is handled by mysql unique index

createUniqueModel.php

<?php namespace App\Helpers;

use Str;
use Exception;

function createUniqueModel($modelClass, $fieldName='hash', $data=[], $length=48, $tries=0) {
    try {
        $model = $modelClass::create(
            array_merge(
                $data,
                [
                    $fieldName => Str::random($length)
                ]
            )
        );
    }
    catch (\Illuminate\Database\QueryException $e) {

        // In case of MySql use errorInfo[1] instead of getCode
        if ($e->errorInfo[1] === 1062) {
            if ($tries > 500) {
                throw new Exception('Can not generate unique model. Field name '.$fieldName);
            }
        }
        else {
            throw $e;
        }

        return createUniqueModel($modelClass, $data, $fieldName, $length, ++$tries);
    }

    return $model;
}

This is helper function. You should create Model with unique index on field. First argument is Model class and second argument is name of unique field.

This functions generate random string and attempts to insert Model into database. In case of success new Model instance is returned. If unique index fails, then function repeats again with new random string. If functions fails 500 times to insert, then it throws error.

If random string length is pretty long, then there is realy low probability for collision

Use it like this:

$account = createUniqueModel(\App\Account::class, 'hash');