How to handle exceptions inside an entity in symfony2 framework - symfony

Question

I want to get some data from an entity class. I tried to use try/catch to handle problems but it is not working (still gives me the Exception screen).
Error: Call to a member function getGroup() on a non-object in
/var/www/html/system/src/Project/SomeBundle/Entity/MyEntity.php line
139
500 Internal Server Error - FatalErrorException Stack Trace
How can I do something like that in an entity?
Code/Entity:
<?php
namespace Project\SomeBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
/**
* MyEntity
*
* #ORM\Table(name="my_entity")
* #ORM\Entity(repositoryClass="Project\SomeBundle\Entity\Repository\MyEntityRepository")
*/
class MyEntity
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255)
* #Assert\Length(max="255")
*/
private $name;
/**
* #var Item[]|Collection
*
* #ORM\OneToMany(targetEntity="Project\SomeBundle\Entity\Item", mappedBy="itemType", cascade={"remove"}, fetch="EXTRA_LAZY")
*/
protected $items;
// [...]
/**
* Get some data
*
* #return string
*/
public function getSomeData()
{
$result = null;
try {
$result = $this->getName() . ' - ' . $this->getItems()->last()->getGroup()->getCode();
}
catch(\Exception $exception) {
$result = $this->getName();
$logFile = fopen('/tmp/error.log', 'a');
fwrite($logFile, $exception->getMessage());
fclose($logFile);
}
return $result;
}
}
Thanks in advance...

Answer 1

The error message Error: Call to a member function getGroup() on a non-object in... has very little to do with where you're receiving it. It means that you are trying to call a function on something that isn't an object.
It seems likely that $this->getItems()->last() is somehow returning null (because there are no items), and then you're calling getGroup() on null which is a non-object.
Try to debug the object on which you're calling getGroup() and see what value it holds just before you call it.

Answer 2

If you want to catch that error you must write try catch as following
try {
$result = $this->getName() . ' - ' . $this->getItems()->last()->getGroup()->getCode();
}
catch(\Symfony\Component\Debug\Exception\FatalErrorException $exception) {
$result = $this->getName();
$logFile = fopen('/tmp/error.log', 'a');
fwrite($logFile, $exception->getMessage());
fclose($logFile);
}
You can see I have changed \Exception to \Symfony\Component\Debug\Exception\FatalErrorException in above code block