Laravel connect polymorphic table to a pivot

gistfile1.txt

// it ain't pretty but it works

// grab all the beer_user pivot records from a table and the corresponding commentable records
$comments = \DB::table('users')
    ->select('beer_user.id', 'comments.comment', 'comments.commentable_id', 'comments.created_at')
    ->join('beer_user', 'users.id', '=', 'beer_user.id')
    ->join('comments', 'beer_user.id', '=', 'comments.commentable_id')
    ->where('beer_user.user_id', $id)
    ->where('comments.commentable_type', 'App\Beer')
    ->get();