php - Symfony - 在字段约束类中获取实体对象

Question

我创建了自定义约束验证器:

class CustomConstraint extends Constraint
{
    public $message = '';
}

class CustomConstraintValidator extends ConstraintValidator
{
    public function validate($value, Constraint $constraint)
    {
         exit($this->context->getObject()); // returns null
    }
}

在docs据称:

Returns the currently validated object.

，但对我而言，它返回 NULL。

附言我不想将此约束分配给实体，只分配给某些表单或字段。

已验证的表单属性:

->add('rejectReasons', null, array(
        'property' => 'name',
        'multiple' => true,
        'constraints' => array(
            new CustomConstraint(array(
                'message' => 'Application can not be refused.'
            )),
        )
    ));

实体中的属性:

/**
 * @ORM\ManyToMany(targetEntity="RejectReason")
 * @ORM\JoinTable(name="relationship_application_reject_reasons",
 *      joinColumns={@ORM\JoinColumn(name="application_id", referencedColumnName="id", onDelete="CASCADE")},
 *      inverseJoinColumns={@ORM\JoinColumn(name="reject_reason_id", referencedColumnName="id")}
 *      )
 */
private $rejectReasons;

更新

我尝试对其他字符串属性施加约束，我仍然得到 NULL。

Answer 1

看ExecutionContextInterface它说:

getObject() Returns the currently validated object.

If the validator is currently validating a class constraint, the object of that class is returned. If it is a validating a property or getter constraint, the object that the property/getter belongs to is returned.

In other cases, null is returned.

如您所见，您必须分配给类或属性或 getter。否则你将得到 null。