laravel-relations/app/Post.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    //

	protected $fillable = ['text', 'title'];

	public function comments(){
		return $this->hasMany('App\Comment');
	}

    public function tags(){
        return $this->belongsToMany('App\Tag');
    }

}