codeigniter - Backbone js model get method returns "(an empty string)" even if modobj.attributes is correctly set -

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i french, sorry poor english. beginner backbone js. have app uses codeigniter 2.1.3 (with mysql) , backbone js 1.0.0

i don't know why model getter 

console.log(obj.get("x"));
still returns "
(an empty string)
"

here js code :

      var questionnaire = backbone.model.extend({         // contain 3 attributes.         // these default values         urlroot: site_url + '/api/questionnaire/id/',         defaults: {             label_questionnaire: '',             id_visuel: '',             intro_questionnaire: '',             version_questionnaire: '',             type_questionnaire: ''               }     });     // create collection of questionnaires     var questionnaires = backbone.collection.extend({         url: site_url + '/api/questionnaires',         model: questionnaire     });      var q =new questionnaire({id: '7'});     q.fetch();     console.log(q.get("type_questionnaire"));     console.log(q.attributes);

the obj.attributes values (correct) :

  id "7" id_questionnaire 7 id_visuel null intro_questionnaire ""  label_questionnaire "
my infos
" type_questionnaire 1 version_questionnaire 0

the php api code :

      require(apppath.'/libraries/rest_controller.php');      /*     *   based on :     *   https://github.com/philsturgeon/codeigniter-restserver */      class api extends rest_controller     {         public function __construct() {             parent::__construct();             $this->load->model('type_questionnaire_model');         }           function questionnaire_get() {             if(!$this->get('id'))               {                 $this->response(null, 400);               }                $questionnaire = $this->survey_model->get_survey( $this->get('id') );                if($questionnaire)               {                   $this->response($questionnaire, 200); // 200 being http response code               }else{                 $this->response(null, 404);               }           }         ...     }

the database mysql table structure :

      create table if not exists `questionnaire` (       `id_questionnaire` int(11) not null auto_increment,       `label_questionnaire` text character set utf8 not null,       `id_visuel` int(11) default null,       `intro_questionnaire` text character set utf8 not null,       `version_questionnaire` int(11) not null,       `type_questionnaire` int(11) not null,       primary key (`id_questionnaire`)     ) engine=innodb  default charset=latin1 auto_increment=18 ;

is problem come defaults values ? can me please ?


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