ORM relation mapping issues in Doctrine and ZF2 - orm

Question

I was puzzled by Doctrine\ORM\Mapping issue. I have two entities and they are Many-To-One, Unidirectional releationship. I want to operate Chipinfo(add/update/delete) without impact on producer. Only persist Chipinfo while no persist producer..
class Chipinfo implements
{
/**
* #var integer
*
* #ORM\Column(name="ChipID", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
protected $chipid;
/**
* #var \Shop\Entity\Producer
*
* #ORM\ManyToOne(targetEntity="Shop\Entity\Producer")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="pId", referencedColumnName="producerid")
* })
*/
protected $pid;
}
class Producer{
/**
* #ORM\Id
* #ORM\Column(name="producerid", type="integer");
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $producerId;
/**
* #ORM\Column(name="producername", type="string")
*/
protected $producerName;
}
ChipInfo and Producer are Many-To-One unidirection relationship: A chipinfo can only be built by one producer while one producer can build multiple chipinfos. What I want is that: add/update/removal of items in Chipinfo would not do any impact on Producer.
$chip = new Chipinfo();
$formData = $this->initFormData($form->getData());
$chip->populate($formData);
$this->getEntityManager()->persist($chip);
$this->getEntityManager()->flush();
private function initFormData(&$raw){
$raw['eid'] = new Encapuser($this->findEntity("Shop\Entity\Encapuser", $raw['eid']));
$this->log($raw->eid);
$raw['vid'] = new Vendors($this->findEntity("Shop\Entity\Vendors", $raw['vid']));
$raw['pid'] = new Producer($this->findEntity("Shop\Entity\Producer", $raw['pid']));
$this->log($raw);
return $raw;
}
would throws errors:
A new entity was found through the relationship 'Shop\Entity\Chipinfo#pid' that was not configured to cascade persist operations for entity: Shop\Entity\Producer#00000000349002ee00000000c955fd11. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example #ManyToOne(..,cascade={"persist"}). If you cannot find out which entity causes the problem implement 'Shop\Entity\Producer#__toString()' to get a clue.
Then I configured the pid as:
#ORM\ManyToOne(targetEntity="Shop\Entity\Producer", cascade={"persist"})
Though the error disappear, but this is not what I want. Because when i call flush() for chipinfo with existing producer A, a new A which is duplicated is inserted.
Therefore, my questions are:
1) How should i configure #manyToone field, I did not get clue from http://doctrine-orm.readthedocs.org/en/2.0.x/reference/working-with-associations.html#transitive-persistence-cascade-operations
2) Should I add:
#ORM\OneToMany, targetEntity="Shop\Entity\Producer"
private #chip;
in producer? If so, would operations(add/delete/update) on producer require construct a #chip?

Answer 1

You have to set the existing producer (the entity retrieved by doctrine) in the $pid field of your entity.
Why do you create a new Producer ? What does findEntity do ? It does not seem to retrieve the actual entity from Doctrine, why is that ?
Usually what you would do is this :
$chip->setPid($this->getEntityManager()->getRepository('Shop\Entity\Producer')->find($pid));