ValidatesOnSave.php

<?php

namespace App\Traits;

use Validator;

trait ValidatesOnSave
{
    protected static function bootValidatesOnSave()
    {
        static::saving(function ($model) {
            if (method_exists($model, 'setDefaultValues')) {
                $model->setDefaultValues();
            }
            $model->validate();
        });
    }

    public function validation()
    {
        throw new \Exception("Model must override 'validation()' method with intended rules");
    }

    public function validate()
    {
        Validator::make($this->attributes, $this->validation())->validate();
    }
}