belongsTo(Category::class, 'category_id', 'id'); } public function thumb_resource() { return $this->belongsTo(Resource::class, 'thumb', 'id')->select(['path', 'id', 'url']); } public function attaches() { return $this->hasMany(Attach::class, 'course_id', 'id'); } public function subscribe() { return $this->hasOne(UserRecord::class); } public function comments() { return $this->hasMany(Comment::class); } }