cakePHP 文件上传的可选验证 [英] cakePHP optional validation for file upload

问题描述

如何通过验证使文件上传成为可选?即使我没有选择任何文件，下面的代码也会验证.仅当我选择了文件时，我才想检查扩展名.如果我没有选择任何文件，它不应返回任何验证错误.

How to make file uploading as optional with validation? The code below validates even if i didn't selected any file. I want to check the extension only if i selected the the file. If i am not selecting any file it should not return any validation error.

class Catalog extends AppModel{
    var $name = 'Catalog';
    var $validate = array(
        'name' => array(
            'rule' => '/^[a-z0-9 ]{0,}$/i',
            'allowEmpty' => false,
            'message' => 'Invalid Catalog name'
        ),
        'imageupload' => array(
            'rule' => array('extension',array('jpeg','jpg','png','gif')),
            'required' => false,
            'allowEmpty' => true,
            'message' => 'Invalid file'
        ),
       );
}

提前致谢

推荐答案

"我分配 $this->data['Catalog']['image'] = $this->data['Catalog']['imageupload']['name'];"

"I assign $this->data['Catalog']['image'] = $this->data['Catalog']['imageupload']['name'];"

所以当你保存你的数据数组时，我假设它看起来像这样:

So by the time you save your data array, it looks something like this I assume:

array(
    'image' => 'foobar',
    'imageupload' => array(
        'name' => 'foobar',
        'size' => 1234567,
        'error' => 0,
        ...
     )
)

这意味着，imageupload 验证规则正在尝试处理此数据:

Which means, the imageupload validation rule is trying to work on this data:

array(
    'name' => 'foobar',
    'size' => 1234567,
    'error' => 0,
    ...
 )

即它试图验证的值是一个数组，而不仅仅是一个字符串.这不太可能通过指定的验证规则.它也可能永远不会空".

I.e. the value it's trying to validate is an array of stuff, not just a string. And that is unlikely to pass the specified validation rule. It's also probably never "empty".

要么创建可以处理此数组的自定义验证规则，要么在尝试验证之前需要在控制器中进行更多处理.

Either you create a custom validation rule that can handle this array, or you need to do some more processing in the controller before you try to validate it.

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