问无法将数据保存到数据库cakephp

EN

public function admin_add_pack($standard_id=null) 
{
    $this->loadModel('Plan');
    $this->loadModel('SubjectTutor');
    $this->loadModel('Standard');
    $this->loadModel('Province');
    $this->loadModel('City');
    $this->loadModel('School');
    $this->loadModel('User');

    $standard_data = $this->Standard->find('first',array('conditions'=>array('Standard.id'=>$standard_id)));

    $province_id = 32;
    $city_id = 44;
    $school_id = 1855;
    $this->set('title_for_layout','Subject');   

    if(!empty($this->request->data))
    {           
        if (!isset($this->request->params['_Token']['key']) || ($this->request->params['_Token']['key'] != $this->request->params['_Token']['key'])) 
        {
            $blackHoleCallback = $this->Security->blackHoleCallback;
            $this->$blackHoleCallback();
        }

        //validate user data
        $this->SubjectTutor->set($this->request->data['SubjectTutor']);
        $this->SubjectTutor->setValidation('add');

        if ($this->SubjectTutor->validates()) 
        {
            // $this->request->data['Subject']['user_id'] = $this->Auth->user('id');
            $userdata   =   $this->request->data['SubjectTutor'];
            $this->SubjectTutor->save($userdata,false);
            $subject_tutor_id   =   $this->SubjectTutor->id;

            $this->SubjectTutor->school_id = 1855;
            $this->SubjectTutor->province_id = 32;
            $this->SubjectTutor->city_id = 44;
            $this->SubjectTutor->state_private = 1;
            $this->Session->setFlash("Record has been added successfully", 'admin_flash_good');
            $this->redirect(array('controller'=>'standards', 'action'=>'subject_list',$standard_id));
        } 
        else 
        {   
            $this->Session->setFlash("Record has not been created", 'admin_flash_bad');
        }
    }
    $tutors =   $this->User->getStandardTutorList($standard_id);
    $subjects = $this->Subject->getStandardSubjectList($standard_id);
    $standards = $this->Standard->getStandardList();
    $provinces = $this->Province->getProvinceList();
    $cities = $this->City->getCityList();
    $schools = $this->School->getSchoolList();

    $this->set(compact('provinces'));
    $this->set(compact('standards','standard_id','province_id','city_id','school_id','standard_data','tutors','subjects','provinces','cities','schools','tutor_id'));
}

<div class="form-group">
<div class="col-sm-6">
    <label for="exampleInputPassword1"> Select Tutor </label>
        <?php echo($this->Form->input('SubjectTutor.tutor_id', array('options'=>$tutors,'div'=>false, 'label'=>false, "class" => "form-control",'empty'=>'Select Tutor')));?>
</div>
</div>

<div class="form-group">
<div class="col-sm-6">
    <label for="exampleInputPassword1"> Select Standard </label>
        <?php echo ($this->Form->input('Subject.standard_id2', array('options'=>$standards,"div"=>false,"default"=>$standard_id,"label"=>false,"class"=>"form-control",'disabled'=>true))); ?>
</div>
</div>
<div class="form-group">
<div class="col-sm-6">
    <label for="exampleInputPassword1">Select Subject </label>
        <?php echo ($this->Form->input("SubjectTutor.subject_id", array('empty'=>'--Select Subject--', 'options'=>$subjects,"div"=>false,"label"=>false,"class"=>"form-control",'disabled'=>false))); ?>
</div>
</div>      
<div class="form-group">
<div class="col-sm-6">
    <label for="exampleInputPassword1">Province </label>
        <?php echo ($this->Form->input("SubjectTutor.province_id", array('empty'=>'--Select Province--', 'options'=>$provinces,"div"=>false,"default"=>$province_id,"label"=>false,"class"=>"form-control",'disabled'=>true))); ?>
</div>
</div>          
<div class="form-group">
<div class="col-sm-6">
     <label for="exampleInputPassword1">City </label>
            <?php echo ($this->Form->input("SubjectTutor.city_id", array('empty'=>'--Select City--', 'options'=>$cities,"div"=>false,"default"=>$city_id,"label"=>false,"class"=>"form-control",'disabled'=>true))); ?>
</div>
</div>  
<div class="form-group">
<div class="col-sm-6">
    <label for="exampleInputPassword1">School </label>
        <?php echo ($this->Form->input("SubjectTutor.school_id", array('empty'=>'--Select School--', 'options'=>$schools,"div"=>false,"default"=>$school_id,"label"=>false,"class"=>"form-control",'disabled'=>true))); ?>
</div>
</div>