在 Cakephp 中创建动态条件验证

Question

我想在 CakePHP 中设置这些验证规则

规则：

其中一个字段是必需的，但不能同时填写。

discount_percent
discount_amount

如果 discount_amount 输入为 0，则应保存 NULL，然后要求 discount_percent > 1 但

如果 discount_percent 输入 0，则应保存 NULL，然后要求 discount_amount > 0 但

我已经尝试过但没有找到正确的方法来执行此验证。

模式代码：

App::uses('AppModel', 'Model');

class Code extends AppModel {

    public $validate = array(

        'discount_amount' => array(
            'rule' => array('checkLimit'),
            'message' => 'Please supply a valid discount_amount'
        ),
        'discount_percent' => array(
            'rule' => array('checkLimit'),
            'message' => 'Please supply a valid discount_percent'
        )
    );

    public function checkLimit($field) {
        $passed = true;

        if (isset($this->data[$this->alias]['discount_amount']) && empty($this->data[$this->alias]['discount_amount'])) {

            ??????

        } else {

            ??????
        }
    }

}

Answer 1

验证规则不应更改任何数据！

因此，验证规则中不允许使用“if 0, save null”。 您应该在 beforeSave() 回调中实现该逻辑。

关于验证，提供了第二个参数，其中包含所有 $data，您可以使用它来验证其他字段（并从数据库中提取额外的必需数据 - 可能是您的产品价格）。

好的文档在http://book.cakephp.org/2.0/en/models/data-validation.html#adding-your-own-validation-methods

Answer 2

小心使用empty 和isset，它们并不完全相反。 empty('0') 返回 true，而 isset('0') 也返回 true。我想你想改用isset 和!isset。

public function checkLimit($field) {
    if ((!isset($this->data[$this->alias]['discount_amount']) && isset($this->data[$this->alias]['discount_percent'])) {
        //only percent is set
        if ($this->data[$this->alias]['discount_percent'] >= 1 && $this->data[$this->alias]['discount_percent'] <= 100) {
            //percent is in correct range
            return true;
        }
    } else if ((isset($this->data[$this->alias]['discount_amount']) && !isset($this->data[$this->alias]['discount_percent'])) {
        //only amount is set
        if ($this->data[$this->alias]['discount_amount'] >= 0 && $this->data[$this->alias]['discount_amount'] <= $products.price) {
            //amount is in correct range
            return true;
        }
    }
    //either neither or both fields are set, or values aren't in correct range
    return false;
}