cakephp 文件字段验证答案

【问题标题】：cakephp file field validationcakephp 文件字段验证
【发布时间】：2013-05-11 02:32:14
【问题描述】：

我正在尝试验证模型中 cakephp 中的文件字段，并在创建和更新时尝试仅在字段不为空时验证文件。在创建时验证工作正常，但在更新时验证 if 字段为空。我只想在字段不为空时验证扩展这是我在模型验证数组中的验证规则

'image' => array(
        'rule1'=>array(
            'rule' => array('extension',array('jpeg','jpg','png','gif')),
            'required' => 'create',
            'allowEmpty' => true,
            'message' => 'Select Valid Image',
            'on' => 'create',
            'last'=>true
        ),
        'rule2'=>array(
            'rule' => array('extension',array('jpeg','jpg','png','gif')),
            //'required' => 'create',
            'allowEmpty' => true,
            'message' => 'Select Valid Image',
            'on' => 'update',
        ),
    ),

【问题讨论】：

你在使用插件吗？如果是这样，请在您的问题中包含该信息。如果没有，考虑使用一个，比如github.com/josegonzalez/upload
不，我没有使用任何插件，但我使用模型 beforeSave 方法来上传和处理文件

标签： cakephp cakephp-2.0

【解决方案1】：

这是验证创建时需要的图像字段的正确方法，并且可以在更新图像字段时允许为空

图像字段验证数组

'image' => array(
    'rule1'=>array(
        'rule' => array('extension',array('jpeg','jpg','png','gif')),
        'required' => 'create',
        'allowEmpty' => true,
        'message' => 'Select Valid Image',
        'on' => 'create',
        'last'=>true
    ),
    'rule2'=>array(
        'rule' => array('extension',array('jpeg','jpg','png','gif')),
        'message' => 'Select Valid Image',
        'on' => 'update',
    ),
),

并在更新操作的 beforevalidation 中取消设置图像字段

function beforeValidate($options = array()){
    if(empty($this->data[$this->alias]['id']))
    {
        return true;
    }
    else
    {
        if(empty($this->data[$this->alias]["image"]["name"])){
        unset($this->data[$this->alias]["image"]);
        }
        return true; //this is required, otherwise validation will always fail
    }
}

【讨论】：

【解决方案2】：

我们可以通过自定义验证来做到这一点，如下所示

public $validate =array(
    'image' => array(
        'rule' => array('checkValidImage'),
        )
    );


 public function checkValidImage($field)
      {

        $extension = array('image/gif', 'image/jpeg', 'image/pjpeg', 'image/x-png', 'image/png', 'image/jpg');
        $isValidFile = in_array($field['new_image']['type'], $extension);
        $errors = array();
        $editMethod = false;
        if(!empty($this->data['ModelName']['id'])) // It will work for Update Method
        {
          if(!empty($this->data['ModelName']['image']['name'] ))
          {
            if (($field['image']['error'] == 1)) 
            {
                $errors [] = "Please upload jpg,png or gif files with size 2 MB.";
            }
            else if (empty($field['image']['name']))
            {
                $errors [] = "Please upload image";
            } 
            else if ($field['image']['size'] >= 2097152) {
                $errors [] = "Please upload jpg,png or gif files with size 2 MB.";
            }
            else if ($isValidFile !=1)
            {

                $errors [] = "Please select file in gif,jpeg,png format.";
            }

          }else
                {
                    $errors [] = "Please select file in gif,jpeg,png format.";
                }

        }
        else
        {
            if(!empty($this->data['ModelName']['image']['name'] )) // It will work for Create Method
            {
                if (($field['image']['error'] == 1)) 
                {
                    $errors [] = "Please upload jpg,png or gif files with size 2 MB.";
                }
                else if (empty($field['ModelName']['name']))
                {
                    $errors [] = "Please upload image";
                } 
                else if ($field['ModelName']['size'] >= 2097152) {
                    $errors [] = "Please upload jpg,png or gif files with size 2 MB.";
                }
                else if (!(in_array($field['image']['type'], $extension)))
                {
                    $errors [] = "Please select file in gif,jpeg,png format.";
                }

            }



        }

        if (!empty($errors))
        {
            return implode("\n", $errors);
        }
        return true;
    }

【讨论】：