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有时,你可能希望基于某些规则来显示不同的约束验证之错误信息。例如,你为新用户建立了一个注册用表单,用户需要输入身份信息和用户凭据来完成注册。他们不得不输入用户名和一个安全密码,但是输入银行账户信息则是可选的。尽管如此,如果用户在该字段输入了信息,你仍然要确保这些可选字段有效,只是要以不同方式来显示错误。
实现此种行为的过程,包括两个步骤:
给验证约束提供不同的错误级别;
根据所配置的错误级别来自定义你的错误信息;
使用payload
选项去为每个约束配置错误级别:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | // src/AppBundle/Entity/User.php
namespace AppBundle\Entity;
use Symfony\Component\Validator\Constraints as Assert;
class User
{
/**
* @Assert\NotBlank(payload = {"severity" = "error"})
*/
protected $username;
/**
* @Assert\NotBlank(payload = {"severity" = "error"})
*/
protected $password;
/**
* @Assert\Iban(payload = {"severity" = "warning"})
*/
protected $bankAccountNumber;
} |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # src/AppBundle/Resources/config/validation.yml
AppBundle\Entity\User:
properties:
username:
- NotBlank:
payload:
severity: error
password:
- NotBlank:
payload:
severity: error
bankAccountNumber:
- Iban:
payload:
severity: warning |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | <!-- src/AppBundle/Resources/config/validation.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
<class name="AppBundle\Entity\User">
<property name="username">
<constraint name="NotBlank">
<option name="payload">
<value key="severity">error</value>
</option>
</constraint>
</property>
<property name="password">
<constraint name="NotBlank">
<option name="payload">
<value key="severity">error</value>
</option>
</constraint>
</property>
<property name="bankAccountNumber">
<constraint name="Iban">
<option name="payload">
<value key="severity">warning</value>
</option>
</constraint>
</property>
</class>
</constraint-mapping> |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | // src/AppBundle/Entity/User.php
namespace AppBundle\Entity;
use Symfony\Component\Validator\Mapping\ClassMetadata;
use Symfony\Component\Validator\Constraints as Assert;
class User
{
public static function loadValidatorMetadata(ClassMetadata $metadata)
{
$metadata->addPropertyConstraint('username', new Assert\NotBlank(array(
'payload' => array('severity' => 'error'),
)));
$metadata->addPropertyConstraint('password', new Assert\NotBlank(array(
'payload' => array('severity' => 'error'),
)));
$metadata->addPropertyConstraint('bankAccountNumber', new Assert\Iban(array(
'payload' => array('severity' => 'warning'),
)));
}
} |
当对 User
对象验证失败时,你可以使用 getConstraint()
方法来取出引发特定失败的约束。每个约束都会暴露附加的payload作为一个公有属性:
1 2 3 4 5 6 | // a constraint validation failure, instance of
// Symfony\Component\Validator\ConstraintViolation
// 约束在验证时失败时的ConstraintViolation实例
$constraintViolation = ...;
$constraint = $constraintViolation->getConstraint();
$severity = isset($constraint->payload['severity']) ? $constraint->payload['severity'] : null; |
比如,你可以利用它来定制 form_errors
区块,以便severity(错误级别)作为附加的HTML class被添加:
1 2 3 4 5 6 7 8 9 10 11 12 | {%- block form_errors -%}
{%- if errors|length > 0 -%}
<ul>
{%- for error in errors -%}
{% if error.cause.constraint.payload.severity is defined %}
{% set severity = error.cause.constraint.payload.severity %}
{% endif %}
<li{% if severity is defined %} class="{{ severity }}"{% endif %}>{{ error.message }}</li>
{%- endfor -%}
</ul>
{%- endif -%}
{%- endblock form_errors -%} |
关于表单自定义输出的更多信息,参考 如何自定义表单渲染。
本文,包括例程代码在内,采用的是 Creative Commons BY-SA 3.0 创作共用授权。