Doctrine query crashing - symfony

Question

Very very weird. I have used this method from doctrine hundreds of times. I have a simple controller that takes an id as parameter. The query that Doctrine generates is wrong and crash.
/**
* #Security("has_role('ROLE_ADMIN')")
* #return Response
*/
public function editSellerAction($id)
{
$em = $this->getDoctrine()->getManager();
$seller = $em->getRepository('SiteUserBundle:Seller')->find($id);
// ...
$form = $this->createForm(new SellerType(), $seller, array(
'method' => 'POST'
));
// ...
}
The query generated is the following
[2/2] DBALException: An exception occurred while executing 'SELECT t1.id AS id2, t1.username AS username3, t1.password AS password4, t1.firstname AS firstname5, t1.lastname AS lastname6 FROM seller t1 WHERE t0.id = ? LIMIT 1' with params ["2"]:
SQLSTATE[42S22]: Column not found: 1054 Unknown column 't0.id' in 'where clause' +
The error thrown makes sense because it's looking at "WHERE t0.id" when it should be looking at "WHERE t1.id". I tried the query with t1 using phpmyadmin and it works.
Any idea what might cause this issue?
/**
* Seller have access to their customer and are able to RW access to the customers
*
* #ORM\Table("seller")
* #ORM\Entity
* #author Michael Villeneuve
*/
class Seller extends User
{
/**
* #var array
*
* #ORM\OneToMany(targetEntity="Customer", mappedBy="seller", cascade={"persist", "remove"})
* #ORM\JoinColumn(name="seller_id", referencedColumnName="id")
**/
protected $customers;
/**
* #var string
*
* #ORM\Column(name="firstname", type="string", length=255, nullable=false)
*/
protected $firstname;
/**
* #var string
*
* #ORM\Column(name="lastname", type="string", length=255, nullable=false)
*/
protected $lastname;
// Other attributes and only getters/setter
/**
*
* #ORM\Entity
*/
class User implements UserInterface
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\Column(type="string", length=255, unique=true)
*/
private $username;
/**
* #ORM\Column(type="string", length=64)
*/
private $password;
I have 3 entities that extends the User (customer, admin and seller).

Answer 1

Updated link: https://www.doctrine-project.org/projects/doctrine-orm/en/2.7/reference/inheritance-mapping.html
Read up a bit on mapped super classes: http://docs.doctrine-project.org/en/latest/reference/inheritance-mapping.html. Basically, your abstract base user class cannot itself be an entity.
So take the #ORM\Entity line out of your User class. That is where the table 0 (t0) is coming from.

Answer 2

You have 2 options:
The first one is to create an abstract User entity and inherit all values from it. This is useful if you have many entities with the same behaviour. I e.g. like to create a BaseEntity with a ID field and some basic methods. All entities can extend this one and automatically have an ID. Cerad explained in his answer how this is done.
The second option are so called discriminator fields. Basically they allow you to have one User table and sub-tables for every extended entity. You can read about them in the official docs.
Which one you end up using is probably case dependent.

Answer 3

Try to add id field to the Seller entity instead of User
/**
* Seller have access to their customer and are able to RW access to the customers
*
* #ORM\Table("seller")
* #ORM\Entity
*/
class Seller extends User
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var array
*
* #ORM\OneToMany(targetEntity="Customer", mappedBy="seller", cascade={"persist", "remove"})
* #ORM\JoinColumn(name="seller_id", referencedColumnName="id")
**/
protected $customers;
/**
* #var string
*
* #ORM\Column(name="firstname", type="string", length=255, nullable=false)
*/
protected $firstname;
/**
* #var string
*
* #ORM\Column(name="lastname", type="string", length=255, nullable=false)
*/
protected $lastname;
// Other attributes and only getters/setter
/**
*
* #ORM\Entity
* #author Michael Villeneuve<michael#panierdachat.com>
*/
class User implements UserInterface
{
/**
* #ORM\Column(type="string", length=255, unique=true)
*/
private $username;
/**
* #ORM\Column(type="string", length=64)
*/
private $password;