code: public function count($coraDbQuery = false)
      {
          // If no query builder object was passed in, then grab the gateway's.
          if (!$coraDbQuery) {
              $coraDbQuery = $this->gateway->getDb();
          }
          $coraDbQuery = $this->model::model_constraints($coraDbQuery);
          return $this->gateway->count($coraDbQuery);
      }
docs: Count the number of results, optionally with query limiters.