至少有一个字段必须填写，cakephp验证

Question

我有4个可选字段，但至少需要填写1个字段（任何字段）？

任何简单的方法来做到这一点？

Answer 1

A custom validation rule是要走的路！

var $validate = array(
    'myField1' => array('atLeastOne'), 
    'myField2' => array('atLeastOne'), 
    'myField3' => array('atLeastOne'), 
    'myField4' => array('atLeastOne') 
); 

function atLeastOne($data) { 
    return !empty($this->data[$this->name]['myField1']) 
      || !empty($this->data[$this->name]['myField2']) 
      || !empty($this->data[$this->name]['myField3']) 
      || !empty($this->data[$this->name]['myField4']); 
} 

你也可以传递你想要比较的所有字段的额外参数，并使其更加通用。

var $validate = array(
    'myField1' => array('atLeastOne', 'myField2', 'myField3', 'myField4'), 
    ... 
); 

// just pulled out of thin air (i.e. untested) 
function atLeastOne($data) { 
    $args = func_get_args(); // will contain $data, 'myField2', 'myField3', ... 

    foreach ($args as $name) { 
     if (is_array($name)) { 
      $name = current(array_keys($name)); 
     } 
     if (!empty($this->data[$this->name][$name])) { 
      return true; 
     } 
    } 

    return false; 
} 

Answer 2

您可能需要使用beforeValidate()回调手动实施验证。例如（在你的模型，我们称之为Item）：

function beforeValidate(){ 
    $valid = false; 
    if(!empty($this->data['Item']['foo'])){ 
     $valid = true; 
    } 
    // do that same thing for the other three fields, setting $valid to true if any of the fields has a value. 
    return $valid && parent::beforeValidate(); 
} 

你也可以做一个比较长的分配是这样，但我觉得这种类型的废话真的很难的阅读：

function beforeValidate(){ 
    $valid = !empty($this->data['Item']['foo']) || !empty($this->data['Item']['bar']) || !empty($this->data['Item']['baz']) || !empty($this->data['Item']['bling']) 
    return $valid && parent::beforeValidate(); 
} 

祝你好运！