发布于 2015-08-27 16:35:06 | 158 次阅读 | 评论: 0 | 来源: 网络整理
Validates that a value is not strictly equal to null. To ensure that
a value is simply not blank (not a blank string), see the NotBlank
constraint.
| Applies to | property or method |
| Options | |
| Class | NotNull |
| Validator | NotNullValidator |
If you wanted to ensure that the firstName property of an Author class
were not strictly equal to null, you would:
# src/Acme/BlogBundle/Resources/config/validation.yml
AcmeBlogBundleEntityAuthor:
properties:
firstName:
- NotNull: ~
// src/Acme/BlogBundle/Entity/Author.php
namespace AcmeBlogBundleEntity;
use SymfonyComponentValidatorConstraints as Assert;
class Author
{
/**
* @AssertNotNull()
*/
protected $firstName;
}
<!-- src/Acme/BlogBundle/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="AcmeBlogBundleEntityAuthor">
<property name="firstName">
<constraint name="NotNull" />
</property>
</class>
</constraint-mapping>
// src/Acme/BlogBundle/Entity/Author.php
namespace AcmeBlogBundleEntity;
use SymfonyComponentValidatorMappingClassMetadata;
use SymfonyComponentValidatorConstraints as Assert;
class Author
{
public static function loadValidatorMetadata(ClassMetadata $metadata)
{
$metadata->addPropertyConstraint('firstName', new AssertNotNull());
}
}
type: string default: This value should not be null.
This is the message that will be shown if the value is null.
type: mixed default: null
2.6 新版功能: The payload option was introduced in Symfony 2.6.
This option can be used to attach arbitrary domain-specific data to a constraint. The configured payload is not used by the Validator component, but its processing is completely up to.
For example, you may want to used several error levels to present failed constraint differently in the front-end depending on the severity of the error.