public static function setRecommend()
 {
     $user_id = Auth::user()->user_id;
     $list_post = Post::where("user_id", '!=', $user_id)->get();
     foreach ($list_post as $post) {
         //            $list_id = (array) DB::select(DB::raw("SELECT * FROM user_posts WHERE user_id != ".$user_id." ORDER BY RAND() LIMIT 10"));
         $list_id = Post::where("user_id", "!=", $user_id)->orderByRaw("rand()")->distinct('photo_link')->take(5)->get();
         foreach ($list_id as $id) {
             $recommend = new PostRecommend();
             $recommend->photo_id = $post["photo_link"];
             $recommend->photo_id_recommend = $id["photo_link"];
             $recommend->rank = 1.0;
             $recommend->save();
         }
         //            print_r($post);
     }
     return $list_id;
 }
 public function setPost()
 {
     $results = PostRecommend::setRecommend();
     return $results;
 }