php - Get Table values using Eloquent Model in Laravel5 -

i want find username post_id using post_tag table using eloquent model. here tables.

user table

user_id(pk) username 

post table

post_id(pk) user_id(fk) 

post_tag table

post_id(fk) tag_id(fk) 

how can fetch username user table using post_tag table. here have tried:

class post extends eloquent {        public function user() {        return $this->belongsto('app\user');       } }  class posttag extends eloquent {       public function post() {            return $this->hasmany('app\post');      } }   $posts = posttag::with('post')->where('tag_id','=','20')->get(); 

one tag belongs multiple posts , each post belong owner/user. thank in advance.

if relations working it:

posttag::find(20)->post()->first()                  ->user()->first()->username; 

you 1 tag belongs many posts, how choose of many posts want user's username?

do want users have post posttag?

edit: try this:

posttag::find(20)->with(['post', 'post.user'])->get(); 

run in artisan tinker or dd result can see returned, think solves problem. note may return lot of data, use take instead of get limit results.