模型验证（Validating Models）

验证模型数据完整性（Validating Data Integrity）

在模型 Phalcon\Mvc\Model 中提供了几个事件（beforeSave、beforeCreate、beforeUpdate）用以数据的验证和过滤。我们推荐使用专用的事件 validation，它允许我们调用内置的验证类进行验证数据：

<?php
 
use Phalcon\Mvc\Model;
use Phalcon\Validation\Validator\Uniqueness;
use Phalcon\Validation\Validator\InclusionIn;
 
class Robots extends Model
{
    public function validation()
    {
        $validation = new Phalcon\Validation;
 
            $validation->add("type", new InclusionIn(
            array(
                "domain" => array("Mechanical", "Virtual")
            )
        );
 
            $validation->add("name", new Uniqueness(
            array(
                "message" => "The robot name must be unique"
            )
        );
 
        return $this->validate($validation);
    }
}

上面的例子使用了内置验证器InclusionIn 和 Uniqueness，更多的内置验证器请查看 验证 章节。

除了内置的验证程序，我们可以创建自定义验证器：

<?php
 
use Phalcon\Validation\Validator;
use Phalcon\Validation\ValidatorInterface;
use Phalcon\ValidationInterface;
 
class MaxMinValidator extends Validator implements ValidatorInterface
{
    public function validate(ValidationInterface $validator, $field, $allowEmpty = FALSE)
    {
        $min   = $this->getOption('min');
        $max   = $this->getOption('max');
 
        $value = $validator->getValue($field);
 
        if ($min <= $value && $value <= $max) {
            $message = new Phalcon\Validation\Message("The field doesn't have the right range of values", $field, "MaxMinValidator", 0);
            $validator->appendMessage($message);
            return false;
        }
 
        return true;
    }
}

Adding the validator to a model:

<?php
 
use Phalcon\Mvc\Model;
 
class Customers extends Model
{
    public function validation()
    {
        $validation = new Phalcon\Validation;
 
            $validation->add("price", new MaxMinValidator(
            array(
                "min"   => 10,
                "max"   => 100
            )
        );
 
        return $this->validate($validation);
    }
}

The idea of creating validators is make them reusable between several models. A validator can also be as simple as:

<?php
 
use Phalcon\Mvc\Model;
use Phalcon\Validation\Message;
 
class Robots extends Model
{
    public function validation()
    {
        if ($this->type == "Old") {
            $message = new Message(
                "Sorry, old robots are not allowed anymore",
                "type",
                "MyType"
            );
 
            $this->appendMessage($message);
 
            return false;
        }
 
        return true;
    }
}

可以通过覆盖 Phalcon\Mvc\Model::getMessages() 方法对默认验证信息就行转换：

<?php
 
use Phalcon\Mvc\Model;
 
class Robots extends Model
{
    public function getMessages()
    {
        $messages = array();
        foreach (parent::getMessages() as $message) {
            switch ($message->getType()) {
                case 'InvalidCreateAttempt':
                    $messages[] = 'The record cannot be created because it already exists';
                    break;
                case 'InvalidUpdateAttempt':
                    $messages[] = 'The record cannot be updated because it doesn\'t exist';
                    break;
                case 'PresenceOf':
                    $messages[] = 'The field ' . $message->getField() . ' is mandatory';
                    break;
            }
        }
 
        return $messages;
    }
}

验证失败事件（Validation Failed Events）

Another type of events are available when the data validation process finds any inconsistency:

原文: http://www.myleftstudio.com/reference/models-validation.html