Undefined property: CodeIgniter\View\View::$db

Hi, need help to solve this problem: 
ErrorException

PHP Code:

Undefined property: CodeIgniter\View\View::$db 


PHP Code:

$this->db->limit 


Need create query to present here:

PHP Code:

90             $this->db->limit(9);
91             $categories = $this->db->get_where('category', array('parent' => 0))->result_array(); 


My proporsal to query is:

PHP Code:

      public function getCategoriesNine($category_id = 0) {
        $getTable = $this->db->table('category')->get();
        if ($category_id > 0) {
          $query = $this->db->table('category', array('parent' => 0))
          ->where(['id' => $category_id ])
          ->limit(9)
          ->get()
          ->getFirstRow();
          return $query ? $query : null;
        }
        return $getTable ? $getTable  : null;
      } 


Please need help if valir of query parse

PHP Code:

->limit(9) 


present in the view is this proporsal

PHP Code:

                            $queryCatNine = (new \App\Models\CommonQueries())->getCategoriesNine();
                            $categories = $queryCatNine->getResultArray(); 


or I'd like to know how to define this property.

Update example need know is valid in the view:

PHP Code:

                            $queryCat = (new \App\Models\CommonQueries())->getCategoriesNine();
                            $categories = $queryCat->getResultArray();
                            $categories->limit(10); 


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