编辑图片上传不工作cakephp使用Qimage

添加图片上传工作正常…但在编辑的情况下，没有上传发生。DB保留旧的图像数据。我用Qimage复制文件。
图片上传控制器

public function edit($id=NULL){
            if (!$id) {
                throw new NotFoundException(__('Invalid Movie'));
            }
            $movie = $this->Movie->findById($id);
            if (!$movie) {
                throw new NotFoundException(__('Invalid Movie'));
            }
            if ($this->request->is(array('post', 'put'))) {
            $this->Movie->id = $id;
            if(!empty($this->request->data['Movie']['image']['name'])){
                    $data['file']= $this->request->data['Movie']['image'];
                    $data['path']= WWW_ROOT . 'img/';
                    unset($this->request->data['Movie']['image']);
                    $this->request->data['Movie']['image']=$this->Qimage->copy($data);
                    $this->Qimage->resize(array(
                        'width'=>200, 'height'=>300,
                        'file'=>WWW_ROOT . 'img/'.$this->request->data['Movie']['image'],
                        'output'=>WWW_ROOT . 'img/'
                        ));
                }
                else{
                    unset($this->request->data['Movie']['image']);
                }
                if ($this->Movie->saveAll($this->request->data['Movie'])) {
                    $this->Session->setFlash(__('Movie has been updated.'));
                    return $this->redirect(array('controller' => 'movies','action' => 'movielist'));
                }else{
                    $this->Session->setFlash(__('Unable to update movie.'));
                }
            }
            if (!$this->request->data) {
                $this->request->data = $movie;
            }
}

请帮助。编辑功能视图-

<?php echo $this->Form->create('Movie');?>
<fieldset>
        <legend><?php echo __('Update Movie'); ?></legend>
        <?php
        echo $this->Form->input('id', array('type' => 'hidden')); 
        echo $this->Form->input('name');
        echo $this->Form->input('about');
        echo $this->Form->file('Movie.image');
        echo $this->Form->input('budget');
        echo $this->Form->submit('Update Movie', array('class' => 'form-submit',  'title' => 'Click here to update the movie')); 
?>
</fieldset>
<?php echo $this->Form->end(); ?>