Abstract code generation to a trait

ExampleModel.php

<?php

namespace App;

use App\Support\Traits\GenerateUniqueCode;
use App\Support\Contracts\GeneratesCodes;
use Illuminate\Database\Eloquent\Model;

class Lead extends Model implements GeneratesCodes
{
    use GenerateUniqueCode;

    // Override
    protected static function getCodeName()
    {
        return 'lead_code';
    }

    /**
     * Logic to generate a new code.
     *
     * @return string
     */
    protected function generateCode()
    {
        return strtoupper(substr(md5(str_random(16)), 0, 8));
    }
}

GeneratesCodes.php

<?php

namespace App\Support\Contracts;

interface GeneratesCodes
{
    /**
     * Logic to generate a code.
     *
     * @return mixed
     */
    function generateCode();
}

GenerateUniqueCode.php

<?php

trait GenerateUniqueCode
{
    /**
     * Boot the trait.
     */
    protected static function bootGenerateUniqueCode()
    {
        static::creating(function ($model) {
            $model->attributes[static::getCodeName()] = $model->generateUniqueCode();
        });
    }

    /**
     * Determine the name of the code column.
     *
     * @return string
     */
    protected static function getCodeName()
    {
        return 'code';
    }

    /**
     * Make sure the code is unique for the model.
     *
     * @return string
     */
    protected function generateUniqueCode()
    {
        $code = $this->generateCode();

        while (static::where(static::getCodeName(), $code)->exists()) {
            $code = $this->generateCode();
        }

        return $code;
    }
}