Symfony2 Relationships using Interfaces results in duplicated table - symfony

Question

I'm trying to relate an entity in one bundle with another in another bundle to make the second one independent from the first one, and be able to reuse it.
I'm following this documentation and this StackOverflows answer.
In the reusable bundle I have a Folder, File a that belongs to the folder and and interface like this:
namespace Acme\FolderBundle\Entity;
/**
* #ORM\Entity
*/
class Folder implements FolderInterface
{
// Has many files
}
namespace Acme\FolderBundle\Entity;
interface FolderInterface
{
// no methods here
}
namespace Acme\FolderBundle\Entity;
/**
* #ORM\Entity
*/
class File
{
// Belongs to one folder
}
And on the other bundle just one class:
namespace Acme\NewBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Acme\FolderBundle\Entity\Folder as BaseFolder;
use Acme\FolderBundle\Entity\FolderInterface;
/**
* #ORM\Entity
*/
class Folder extends BaseFolder implements FolderInterface
{
// Has many files
}
And the config.yml's ORM configuration:
orm:
auto_generate_proxy_classes: %kernel.debug%
auto_mapping: true
resolve_target_entities:
Acme\FolderBundle\Entity\FolderInterface: Acme\NewBundle\Entity\Folder
If I try to update my database schema, I get the following error:
[Doctrine\DBAL\Schema\SchemaException]
The table with name 'foldersDatabase.folder' already exists.
To get this working, I have to explicitly change one of the Folder's Entities table:
namespace Acme\FolderBundle\Entity;
/**
* #ORM\Entity
* #ORM\Table(name="distributed_folder")
*/
class Folder implements FolderInterface
{
// Has many files
}
Then, everything works but I get stuck with a table in my database (distributed_folder) that is never used.
Thanks a lot in advance!!
EDIT:
Fixed the annotation in the FolderInterface

Answer 1

You can not make one entity extend another entity this way.
If you want to have an abstract class which contains the fields for two or more subclass entities, you should mark the abstract class as #ORM\MappedSuperclass , and make sure, it will not have the annotation #Entity. While on the subclasses , they each should have #Entity annotation , and #Table annotation with a unique name attribute.
Here is an example :
<?php
namespace Radsphere\MissionBundle\Model\Core\BaseAbstract;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\MappedSuperclass
*
* An abstract class implementation of mission
*/
abstract class AbstractMission implements MissionInterface, IntegratedPluginInterface
{
/**
* #ORM\Id()
* #ORM\Column(name="id", type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(type="string", length=36, unique=true)
*/
protected $guid;
/**
* #ORM\Column(type="string", length=255)
*/
protected $title;
/**
* #ORM\ManyToMany(targetEntity="MissionTask", cascade={"persist", "remove"})
* #ORM\JoinTable(name="mtm_mission_task",
* joinColumns={#ORM\JoinColumn(name="mission_id", referencedColumnName="id", onDelete="CASCADE")},
* inverseJoinColumns={#ORM\JoinColumn(name="task_id", referencedColumnName="id", onDelete="CASCADE")}
* )
*/
protected $tasks;
/**
* {#inheritDoc}
*/
public function addTask(MissionTaskInterface $missionTask)
{
$this->getTasks()->add($missionTask);
$missionTask->setMission($this);
}
/**
* {#inheritDoc}
*/
public function setTasks(Collection $tasks)
{
/** #var MissionTaskInterface $task */
foreach ($tasks as $task) {
$task->setMission($this);
}
$this->tasks = $tasks;
}
/**
* {#inheritDoc}
*/
public function getTasks()
{
$tasks = $this->tasks;
foreach ($tasks as $task) {
if ($task instanceof MissionTaskInterface) {
if (!$task->getIsEnabled()) {
/** #var $tasks Collection */
$tasks->removeElement($task);
}
}
}
return $tasks;
}
}
and the entity itself:
<?php
namespace Radsphere\MissionBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;
use Radsphere\MissionBundle\Model\Core\BaseAbstract\AbstractMission;
/**
* Mission entity
*
* #ORM\Table(name="mission_bundle_mission", indexes={#ORM\Index(name="guid_idx", columns={"guid"})})
* #ORM\HasLifecycleCallbacks
* #ORM\Entity(repositoryClass="MissionRepository")
*/
class Mission extends AbstractMission
{
/**
* Constructor
*/
public function __construct()
{
$this->tasks = new ArrayCollection();
}
}