Post.php

<?php

use Cviebrock\EloquentSluggable\SluggableInterface;
use Cviebrock\EloquentSluggable\SluggableTrait;

class Post extends Eloquent implements SluggableInterface {

    protected $fillable = ['title', 'slug', 'user_id', 'content'];

    use SluggableTrait;

    protected $sluggable = array(
        'build_from' => 'title',
        'save_to'    => 'slug'
    );

    public function user() {

        return $this->belongsTo('User');
    }
}