Doctrine2 OneToMany without mappedBy - symfony

Question

I have an entity 'listing' with OneToMany to entity 'view', the key between these to is view.content_id which holds the ID of listing, however, it also relates to other entities, so by adding
/**
* #var Listing
*
* #ORM\ManyToOne(targetEntity="\Acme\Bundle\Entity\Listing", inversedBy="views")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="content_id", referencedColumnName="id")
* })
*/
private $listing;
To the view it brakes because when saving the view entity the content_id becomes null.
How can I fix it?
Relation on listing side:
/**
* #var views
*
* #ORM\OneToMany(targetEntity="\Acme\Bundle\Entity\View", mappedBy="listing")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="id", referencedColumnName="content_id")
* })
*/
private $views;
I'm making queries by joining the Listing.views and adding WITH content_type = :ContentType which discriminates some 'view' results.

Answer 1

I'm coming pretty late to the party, but thought I would answer in case it helps someone else.
Because of the relation you've established between the two entities, you now have to assign an object to that property rather than the FK value itself. Like so:
$listing = $em->getRepository('Acme\Bundle\Entity\Listing')
->find($content_id);
$view->setListing($listing);
And not:
$view->setListing($content_id);
Of course, if it turned out to be something else, I'd be curious to know.
:^)