Symfony 2 Doctrine persist Entity with related entities - php

Question

I have a problem trying to persist a new entity with Symfony 2.7.11 that have a related Entity.
I need to create a Landing that can have many universities so I created 3 tables
landing
landingId (primary Key)
university
universityId (primary Key)
landingUniversity
landingId (both are primary Key) (foreign Key Landing)
universityId (foreign Key University)
And I have just 2 Entities (Landing & University) and a Many To Many relation (unidirectional, because I just want to know the universities added to a landing, so University hasn't got anything about landing)
First, I find each University on my database and I save them. Then I create the new Landing and I add all of them.
$universityRepository = $this->em->getRepository('University');
$universities = array();
foreach ($listUniversities as $universityId){
$university= $cursosRepository->findById($universityId);
$universities[] = $university[0];
}
$newLanding = new Landing();
$newLanding->setName($landing["name"]);
foreach ($universities as $university){
$newLanding->addUniversity($university);
}
$em = $this->getEntityManager();
$em->persist($newLanding);
$em->flush();
And I'm getting this error when symfony executes flush():
Could not resolve type of column "landingId" of class University
What I'm doing wrong?
My Entity:
/**
* Landing
*
* #ORM\Table()
* #ORM\Entity(repositoryClass="LandingRepository")
*/
class Landing
{
/**
* #var integer
*
* #ORM\Column(name="landingid", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=250)
*/
private $name;
/**
* #var integer
*
* #ORM\ManyToOne(targetEntity="Language")
* #ORM\JoinColumn(name="languageId", referencedColumnName="languageId")
*/
private $languageId;
/**
* #ORM\ManyToMany(targetEntity="University")
* #ORM\JoinTable(name="landingUniversity",
* joinColumns={#ORM\JoinColumn(name="landingId", referencedColumnName="landingId")},
* inverseJoinColumns={#ORM\JoinColumn(name="unversityId", referencedColumnName="unversityId")}
* )
*/
private $universities;
Thank you so much!!!

Answer 1

The error message is really explicit. Your error is here :
joinColumns={#ORM\JoinColumn(name="landingId", referencedColumnName="landingId")}
should be
joinColumns={#ORM\JoinColumn(name="landingId", referencedColumnName="landingid")}
because your Landing entity doesn't contain any landingId database field, but landingid.
But you'd rather edit the column name of your $id property :
/**
* #var integer
*
* #ORM\Column(name="landingId", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;