我有Section(Parent),Language(子)和Currency(子)实体。它们的属性通常通过Validator验证,但我有问题如何检查用户是否要删除与Section实体连接的Currency或Language实体。 Symfony抛出异常:
An exception occurred while executing 'DELETE FROM Language WHERE id = ?'
with params [5]: SQLSTATE[23000]: Integrity constraint violation: 1451
Cannot delete or update a parent row: a foreign key constraint fails
(`mywork`.`section`, CONSTRAINT `FK_E2CE437382F1BAF4` FOREIGN KEY
(`language_id`) REFERENCES `language` (`id`))
我希望捕获此异常,然后发送正常消息。我知道我可以通过try catch块捕获此错误,但在我看来,这在Symfony中不是正确的解决方案。而且我不知道如何从Doctrine \ DBAL \ DBALException获取错误代码。
我想找到类似于Validator的解决方案。如果属性值不正确,则将消息发送给用户(客户端)。例如:
My\WebBundle\Entity\Highlight:
properties:
abbreviation:
- NotBlank:
message: "The abbreviation must be not empty."
- Length:
max: 8
maxMessage: "Error value <strong>{{ value }}</strong> - The abbreviation can contain max {{ limit }} characters."
我在如何捕获唯一记录和为用户写消息方面遇到同样的问题。
答案 0 :(得分:2)
使用Class Constraint Validator 这种方式在验证函数内:
// ...
if ($language->getSection() !== NULL) {
// If you're using the new 2.5 validation API (you probably are!)
$this->context->buildViolation($constraint->message)
->atPath('section')
->addViolation();
// If you're using the old 2.4 validation API
/*
$this->context->addViolationAt(
'section',
$constraint->message,
array(),
null
);
*/
}
您可以检查唯一约束,但我认为更好的想法是使用bild-in validator
编辑: 如果我说得对,你就像下面的父母一样。尝试使用preRemove LifeCycleCallbacks
/**
* @ORM\Entity
* @ORM\HasLifecycleCallbacks()
*/
class Parent
{
/**
* @var ArrayCollection
*
* @ORM\OneToMany(targetEntity="Child", mappedBy="parent")
*/
private $children;
/**
* @ORM\PreRemove
*/
public function deleteAllChildren()
{
//prevent
foreach ($this->getChildren() as $child) {
$this->children->removeElement($child);
$child->setParent(NULL);
}
}
}