Laravel trait to maintain created_at and updated_at columns in Laravel models.

Model.php

?php namespace App;

use Illuminate\Database\Eloquent\Model;

class Quote extends Model {

    use TracksUsers;

}

TracksUsers.php

<?php namespace App;

use Illuminate\Database\Eloquent\Model;

trait TracksUsers {

	/**
     * Boot the soft deleting trait for a model.
     *
     * @return void
     */
    public static function bootTracksUsers()
    {
    	$userId = \Auth::user() ? \Auth::user()->id : null;

        static::creating(function($model) use($userId) {
        	$model->created_by = $model->created_by ?: $userId;
        	$model->updated_by = $model->updated_by ?: $userId;
        });

        static::updating(function($model) use($userId) {
        	$model->updated_by = $model->updated_by ?: $userId;
        });
    }

    public function creator()
	{
		return $this->belongsTo(User::class, 'created_by');
	}

}