public function getItemBatchesAction() { if ($this->_request->getParam('wh_id')) { $coldchain = new Model_StockBatch(); $coldchain->form_values['wh_id'] = $this->_request->getParam('wh_id'); $result = $coldchain->getItemBatches(); } else { $result = array("error" => "Please provide wh_id param. e.g. (?wh_id=1)"); } echo Zend_Json::encode($result); }