CakePHP 仅在输入数据时进行表单验证

我正在尝试上传其中一个模特的照片，并且当我进入编辑模式时。当用户只想编辑与该记录相关的文本时，它仍然要求我上传照片。以下是我的验证规则。

    'display_photo' => array(
        'uploadError' => array(
            'rule' => array('uploadError'),
            'message' => 'Please select a Photo.',
            'allowEmpty' => true,
        ),
        'mimeType' => array(
            'rule' => array('mimeType', array('image/gif', 'image/png', 'image/jpg', 'image/jpeg')),
            'message' => 'Please only upload images (gif, png, jpg).',
            'allowEmpty' => true,
        ),
        'fileSize' => array(
            'rule' => array('fileSize', '<=', '5MB'),
            'message' => 'Photo must be less than 5MB.',
            'allowEmpty' => true,
        ),
        'photoUpload' => array(
            'rule' => array('photoUpload'),
            'message' => 'Unable to process Photo upload.',
            'allowEmpty' => true,
        ),
    ),

上传功能

   public function photoUpload($check = array()) {
        if (!is_uploaded_file($check['display_photo']['tmp_name'])) {
            return false;
        }

        if (!move_uploaded_file($check['display_photo']['tmp_name'], WWW_ROOT . 'img' . DS .
            'portfolios' . DS . $this->data[$this->alias]['slug'].".".pathinfo($check['display_photo']['name'], PATHINFO_EXTENSION))) {
            return false;
        }
        $this->data[$this->alias]['display_photo'] = $this->data[$this->alias]['slug'].".".pathinfo($check['display_photo']['name'], PATHINFO_EXTENSION);
        return true;
    }

设置参数

'on' => 'create'

只是为了'uploadError' rule

'uploadError' => array(
    'rule' => array('uploadError'),
    'message' => 'Please select a Photo.',
    'on' => 'create',
),

这样，cake 将强制用户在创建记录时上传图像。

相反，其他验证规则将始终有效，但前提是文件实际上传。

see the manual http://book.cakephp.org/2.0/en/models/data-validation.html#on