public function get_all_receipts_post()
 {
     $receipts_repo = new Receipts_Repository($this->base_model->get_db_instance());
     $receipts = $receipts_repo->get_all_receipts();
     $data = array();
     foreach ($receipts as $receipt) {
         $receipt_items = $receipts_repo->get_all_items_from_receipt($receipt->id);
         $total_amount = 0;
         foreach ($receipt_items as $receipt_item) {
             $total_amount += $receipt_item->price * $receipt_item->quantity;
         }
         array_push($data, array('id' => $receipt->id, 'sales_report_id' => $receipt->sales_report_id, 'is_reported' => $receipt->is_reported, 'total_amount' => $total_amount, 'created_at' => $receipt->created_at, 'updated_at' => $receipt->updated_at));
     }
     echo json_encode($data);
 }