/**
  * Update a category's inheritance
  *
  * @param  \Illuminate\Database\Eloquent\Collection $categories
  * @return void
  */
 public function updateInheritance(Collection $categories)
 {
     $branch = [];
     if ($this->parent_id !== null) {
         $parent = $categories->whereLoose('id', $this->parent_id)->first();
         while ($parent && $parent->is_inheriting) {
             $branch[] = $parent->id;
             $parent = $categories->whereLoose('id', $parent->parent_id)->first();
         }
     }
     $branch[] = $this->id;
     $this->ancestors()->sync($branch);
 }