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Question

Add me to the list of people who can't work out what's wrong with their Doctrine mapping. I'm modelling a Chess Game with OneToMany Halfmoves - any ideas?

DDL:

create table game ( game_id int primary key  ); 
create table halfmove(halfmove_id int primary key, game_id int);

Game.php:

/**
* Game
*
* @ORM\Table(name="game")
* @ORM\Entity
*/
class Game  
{
/**
 * @ORM\OneToMany(targetEntity="Halfmove", mappedBy="game")
 */
private $halfmoves;

public function getHalfmoves(){
    return $this->halfmoves;
}

public function setHalfmoves($halfmoves){
    $this->$halfmoves = $halfmoves;
}

public function __construct()
{
    $this->halfmoves = new ArrayCollection();
}
...

Halfmove.php:

/**
 * Halfmove
 *
 * @ORM\Table(name="halfmove")
 * @ORM\Entity
 */
class Halfmove
{
/**
 * @var integer
 *
 * @ORM\Column(name="game_id", type="integer", nullable=true)
 */
private $gameId;


/**
 * @ORM\ManyToOne(targetEntity="Game", inversedBy="halfmoves")
 * @ORM\JoinColumn(name="game_id", referencedColumnName="game_id")
 */
private $game;

public function getGame(){
    return $this->game;
}

public function setGame($game){
    $this->game = $game;
}
...

Query that generates error:

    $em = $this->getDoctrine()->getManager();
    $query = $em
    ->createQuery(
            'SELECT p, c FROM AppBundle:Halfmove p
        JOIN p.Game c
        WHERE c.game_id = :id'
            )->setParameter('id', 3525);
    $result =  $query->getSingleResult();

Error message:

2016-11-28 12:46:46] request.CRITICAL: Uncaught PHP Exception Doctrine\ORM\Query\QueryException: "[Semantical Error] line 0, col 62 near 'c ': Error: Class AppBundle\Entity\Halfmove has no association named Game" at /Users/cats/Sites/chess-ui/vendor/doctrine/orm/lib/Doctrine/ORM/Query/QueryException.php line 63 {"exception":"[object] (Doctrine\ORM\Query\QueryException(code: 0): [Semantical Error] line 0, col 62 near 'c ': Error: Class AppBundle\Entity\Halfmove has no association named Game at /Users/cats/Sites/chess-ui/vendor/doctrine/orm/lib/Doctrine/ORM/Query/QueryException.php:63, Doctrine\ORM\Query\QueryException(code: 0): SELECT p, c FROM AppBundle:Halfmove p JOIN p.Game c WHERE c.game_id = :id at /Users/cats/Sites/chess-ui/vendor/doctrine/orm/lib/Doctrine/ORM/Query/QueryException.php:41)"} []

Answer 1

You declared $game in Halfmove entity. Try after replacing p.Game with p.game.

$em = $this->getDoctrine()->getManager();
$query = $em->createQuery(
        'SELECT p, c FROM AppBundle:Halfmove p
            JOIN p.game c
            WHERE c.game_id = :id'
        )->setParameter('id', 3525);
$result =  $query->getSingleResult();

Additional Update

Additionally i recommend some changes in you entities.

Game.php

<?php

use Doctrine\ORM\Mapping as ORM;

/**
* Game
*
* @ORM\Table(name="game")
* @ORM\Entity
*/
class Game  
{

    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\OneToMany(targetEntity="Halfmove", mappedBy="game")
     */
    private $halfmoves;

    public function getHalfmoves(){
        return $this->halfmoves;
    }

    public function setHalfmoves($halfmoves){
        $this->$halfmoves = $halfmoves;
    }

    public function __construct()
    {
        $this->halfmoves = new ArrayCollection();
    }
    ...

Halfmove.php

<?php
use Doctrine\ORM\Mapping as ORM;

/**
 * Halfmove
 *
 * @ORM\Table(name="halfmove")
 * @ORM\Entity
 */
class Halfmove
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\ManyToOne(targetEntity="Game", inversedBy="halfmoves")
     * @ORM\JoinColumn(name="game_id", referencedColumnName="id")
     */
    private $game;

    public function getGame(){
        return $this->game;
    }

    public function setGame($game){
        $this->game = $game;
    }
    ...

Execute Query

$query = $em->getRepository("Halfmove")
    ->createQueryBuilder('p')
    ->innerJoin("p.game", 'c')
    ->where("c.id = :CId")
    ->setParameter("CId", 3525);

$moves = $query->getQuery()->getResult();