CakePHP extra check for file upload

Question

How to make file upload optional with verification? The code below checks even if I have not selected any files. I want to check the extension only if I selected the file. If I do not select any file, it should not return verification errors.

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'
        ),
       );
}

early

Answer 1

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

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,
        ...
     )
)

, imageupload :

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

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Answer 2

:

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:

// is any image uploaded?
$isNoFileUploaded = ($this->request->data['Model']['field_name']['error'] == UPLOAD_ERR_NO_FILE) ? true : false ;
if ($isNoFileUploaded) {
    $this->Model->validator()->remove('field_name');
}

:

( , ), @deceze answer