Retrieve nested object with OneToMany/ManyToOne doctrine relationship - php

Question

I want to do a one to many / many to one relationship between two DAO.
After annoting properties, I have an unexpected and unlimited object in the result.
/**
* TicketSponsorDAO
*
* #ORM\Table(name="ticket_sponsor")
* #ORM\Entity
*/
class TicketSponsorDAO {
/**
* #var int
*
* #ORM\Column(name="ticket_id", type="integer")
*/
private $ticketId;
/**
* #ORM\ManyToOne(targetEntity="TicketDAO", inversedBy="sponsors")
* #ORM\JoinColumn(name="ticket_id", referencedColumnName="id")
*/
private $ticket;
...
}
And
/**
* TicketDAO
*
* #ORM\Table(name="ticket")
* #ORM\Entity
*/
class TicketDAO
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\OneToMany(targetEntity="TicketSponsorDAO", mappedBy="ticket")
*/
private $sponsors;
public function __construct() {
$this->sponsors = new ArrayCollection();
}
...
}
When I execute:
$sponsorEm = $em->getRepository(TicketDAO::class);
$spo = $sponsorEm->find("2");
var_dump($spo);
I have good properties about the ticket DAO, but the relation doesn't work and I have an unlimited object which is returned.
So in the MySQL database, I have the foreign key, the FK index and the primary key which are here.
The var_dump:
I follow this documentation: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/association-mapping.html#one-to-many-bidirectional

Answer 1

Use symfony dumper as you are having a circular reference.
dump($spo);

Answer 2

Hi var_dump() will return your the type of objects and classes.
you should try to fetch the propertes like this
$spo->getSponsers();
it will return you an array or may be an collection;

Answer 3

For me it looks like one ticket have many sponsors and in this case I see only one problem. There is no auto_increment id in the TicketSponsorDao table, but there is a ticket_id column and I don't understand the purpose of that.
/**
* TicketSponsorDAO
*
* #ORM\Table(name="ticket_sponsor")
* #ORM\Entity
*/
class TicketSponsorDAO {
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
...
}

Answer 4

There is a recursion between the objets it's logic with OneToMany/ManyToOne relationship because the object of One is referred in the object of Many, ...
The var_dump doesn't manage it correctly.
To display the object I use dump from Symfony and it's good!
We can add a __toString with return serialize($this) into DAO class if the dump is displayed in browser.
Otherwise, we have an error:
... ENTITY could not be converted to string ...