The association refers to the inverse side field which does not exist - symfony

Question

I have two entities:
TicketEntity :
/**
* #ORM\MappedSuperclass()
*/
class Ticket implements TicketInterface
{
const DIR_UPLOAD = 'TicketUpload';
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #ORM\OneToMany(targetEntity="AppBundle\Entity\Attachment", mappedBy="ticket", cascade={"remove"}, orphanRemoval=true)
*/
protected $attachments;
/**
* Ticket constructor.
*/
public function __construct()
{
$this->attachments = new ArrayCollection();
}
public function getId(): ?int
{
return $this->id;
}
/**
* Add attachments
*
* #param Attachment $attachments
* #return Ticket
*/
public function addAttachment(Attachment $attachments)
{
$this->attachments[] = $attachments;
return $this;
}
/**
* Remove attachments
*
* #param Attachment $attachments
*/
public function removeAttachment(Attachment $attachments)
{
$this->attachments->removeElement($attachments);
}
/**
* Get attachments
*
* #return Collection
*/
public function getAttachments()
{
return $this->attachments;
}
}
AttachmentEntity:
/**
* #ORM\Entity(repositoryClass="AppBundle\Repository\AttachmentRepository")
* #ORM\Table(name="ticket_attachments")
*/
class Attachment
{
const DIR_UPLOAD = 'TicketUpload';
/**
* #var int
*
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(type="integer")
*/
private $id;
/**
* #var string
* #ORM\Column(type="text", nullable=true)
*/
private $name;
/**
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\Ticket", inversedBy="attachments")
* #ORM\JoinColumn(name="ticket_id", referencedColumnName="id", nullable=true)
*/
protected $ticket;
/**
* #Assert\File(
* maxSize = "300k",
* mimeTypes = {"application/pdf", "application/x-pdf", "text/plain", "application/msword",
* "application/vnd.ms-excel", "image/jpeg", "image/x-citrix-jpeg", "image/png", "image/x-citrix-png", "image/x-png", "image/gif"},
* mimeTypesMessage = "Liste de formats de fichiers acceptés : .pdf,.txt,.doc,.xls,.jpg,.png,.gif"
* )
*/
private $attachmentFile;
/**
* #ORM\Column(type="string", nullable=true)
*
*/
private $attachment;
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
public function getName()
{
return $this->name;
}
public function setName($name): self
{
$this->name = $name;
return $this;
}
public function getTicket(): ?Ticket
{
return $this->ticket;
}
public function setTicket(Ticket $ticket): void
{
$this->ticket = $ticket;
}
/**
* #return mixed
*/
public function getAttachment(): ?string
{
return $this->attachment;
}
public function setAttachment($attachment): self
{
$this->attachment = $attachment;
return $this;
}
public function getAttachmentFile(): ?UploadedFile
{
return $this->attachmentFile;
}
/**
* #param $attachmentFile
* #return Ticket
*/
public function setAttachmentFile($attachmentFile): self
{
$this->attachmentFile = $attachmentFile;
return $this;
}
public function getAttachmentWebPath()
{
return self::DIR_UPLOAD . '/' . $this->getAttachment();
}
}
My goal is that a ticket can have several attachments.
And I have this error:
The association AppBundle\Entity\Attachment#ticket refers to the
inverse side field AppBundle\Entity\Ticket#attachments which does not
exist.
I don't know where I'm wrong... Anyone know ?
Regards

Answer 1

mapped superclasses are really inconvenient. really. (emphasis mine)
A mapped superclass cannot be an entity, it is not query-able and
persistent relationships defined by a mapped superclass must be
unidirectional (with an owning side only). This means that One-To-Many
associations are not possible on a mapped superclass at all.
Furthermore Many-To-Many associations are only possible if the mapped
superclass is only used in exactly one entity at the moment. For
further support of inheritance, the single or joined table inheritance
features have to be used.
so, you're not technically doing something wrong, it just isn't supported at all. The error message produced isn't helpful at all though...