/**
  * Get last notification of the current
  * entity of a specific category
  *
  * @param $category
  * @param $to_id
  * @param $entity
  * @return mixed
  */
 public function getLastNotificationByCategory($category, $to_id, $entity)
 {
     $query = $this->notification->wherePolymorphic($to_id, $entity);
     if (is_numeric($category)) {
         return $query->orderBy('created_at', 'desc')->where('category_id', $category)->first();
     }
     return $query->whereHas('body', function ($categoryQuery) use($category) {
         $categoryQuery->where('name', $category);
     })->orderBy('created_at', 'desc')->first();
 }
 /**
  * Get last notification of the current
  * entity of a specific category
  *
  * @param         $category
  * @param         $to_id
  * @param         $entity
  * @param Closure $filterScope
  * @return mixed
  */
 public function getLastNotificationByCategory($category, $to_id, $entity, Closure $filterScope = null)
 {
     $query = $this->notification->wherePolymorphic($to_id, $entity)->byCategory($category)->orderBy('created_at', 'desc');
     $query = $this->applyFilter($filterScope, $query);
     return $query->first();
 }