No identifier/primary key specified for Entity (...) Every Entity must have and identifier/primary key

Question

I have Peticion entity but something is missing because appears the following error:

No identifier/primary key specified for Entity (...) Every Entity must have and identifier/primary key

This is the entity code:

<?php

namespace Project\UsuarioBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Peticion
 *
 * @ORM\Table(name="peticion")
 * @ORM\Entity
 */
class Peticion
{
    /**
     *
     * @ORM\Id
     * @ORM\ManyToMany(targetEntity="Project\UsuarioBundle\Entity\Usuario", inversedBy="usuNick2")
     * @ORM\JoinTable(name="USUARIO",
     *      joinColumns={@ORM\JoinColumn(name="USU_NICK_1", referencedColumnName="USU_NICK")},
     *      inverseJoinColumns={@ORM\JoinColumn(name="USU_NICK_2", referencedColumnName="USU_NICK")}
     *      )
     */
    private $usuNick1;

    /**
     *
     * @ORM\Id
     * @ORM\ManyToMany(targetEntity="Project\UsuarioBundle\Entity\Usuario", mappedBy="usuNick1"))
     */
    private $usuNick2;

    /**
     * @var \DateTime
     *
     * @ORM\Column(name="PET_FECHA", type="date", nullable=false)
     */
    private $fecha;

Solution 1

You need to specify id field and remove other @ORM\Id annotations. Identifiers / Primary Keys at doctrine documentation.

Every entity class needs an identifier/primary key. You designate the field that serves as the identifier with the @Id marker annotation.

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

Solution 2

The solution is to add the id field to the EntityName.orm.yml id: true For example:

AppBundle \ Entity \ Supplier:
   type: entity
   table: sylius_supplier
   fields:
     id:
       type: integer
       id: true
       generator:
         strategy: AUTO
     name: .......

Comments

[Ryall]

This is incorrect, Doctrine should work with compound IDs (multiple IDs) and the variable does not need to be $id

[Gogowitsch]

I found that the @ORM\Column(type="integer") is crucial. I am using Doctrine 2.7.