NullableFields trait for Laravel 5

NullableFields.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

/**
 * Use this trait if you some of the fields could be converted to null
 * automatically if they are empty.
 * In the Model class $nullable properties should have to be defined as:
 *
 * protected static $nullable = [];
 */

trait NullableFields
{
    // /**
    //  * The attributes that should be convert to null in case of empty imput.
    //  *
    //  * @var array
    //  */
    // protected static $nullable = [];

    /**
    * Boot the nullable fields trait for a model.
    *
    * @return void
    */
    protected static function bootNullableFields()
    {
        static::saving(function (Model $model) {
            $model->setNullables();
        });
    }

    /**
    * Set empty nullable fields to null.
    *
    * @return void
    */
    protected function setNullables()
    {
        foreach ($this->nullable as $field) {
            if (!is_numeric($this->attributes[$field]) && empty($this->attributes[$field])) {
                $this->attributes[$field] = null;
            }
        }
    }
}