createQueryBuilder / Join Column - Symfony - php

Question

I have a trouble to implement this SQL Request :
SELECT *
FROM project
LEFT JOIN user
ON project.idAuthor=user.id
WHERE project.isVisible = 1 AND
user.role = 'agency'
To a simple Symfony Query Builder :
$query = $this->createQueryBuilder('p')
->leftJoin('WebAwardsBundle:User', 'u')
->where('p.isVisible = 1')
->andwhere("u.role = 'agency'")
->orderBy('p.id', 'DESC')
->getQuery();
The response of this query give me all the project, include the project when role !== agency ...
I don't know where I can put the ON project.idAuthor=user.id
Mapping :
Project :
/**
* Project
*
* #ORM\Table(name="project")
*#ORM\Entity(repositoryClass="WebAwardsBundle\Repostory\ProjectRepository")
*/
class Project
{
...
/**
* #var int
*
* #ORM\ManyToOne(targetEntity="User", inversedBy="projects")
* #ORM\JoinColumn(name="idAuthor", referencedColumnName="id")
*/
private $idAuthor;
...
User :
/**
* User
*
* #ORM\Table(name="user")
* #ORM\Entity(repositoryClass="WebAwardsBundle\Repository\UserRepository")
*/
class User implements UserInterface, \Serializable{
...
/**
* #ORM\OneToMany(targetEntity="Project", mappedBy="idAuthor")
*/
private $projects;
...

Answer 1

The correct answer to implement this SQL Request :
SELECT *
FROM project
LEFT JOIN user
ON project.idAuthor=user.id
WHERE project.isVisible = 1 AND
user.role = 'agency'
is to join the correct column of the entity (project.idAuthor to user in this case) :
$query = $this->createQueryBuilder('p')
->join('p.idAuthor', 'u')
->where('p.isVisible = 1')
->andWhere("u.role = 'agency'")
->orderBy('p.id', 'DESC')
->getQuery();