OneToOne: Support for polymorphic associations #5332

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admin · 2026-01-22T15:04:44+01:00

admin commented

2026-01-22 15:04:44 +01:00

Originally created by @ihorsamusenko on GitHub (Nov 20, 2016).

Case:
I have plenty of entities in the system. I also have entity_alias table which consist of two fields: alias (pk), entity_id. (NOTE: in my database all the entities have a unique id across the whole database, that is why I do not have entity_type field in entity_alias table).

Goal:
Create a trait which can be used to any entity and which provides an ability to set, get and drop alias for an entity.

Code example:
Alias entity:

/**
 * Class Alias
 *
 * @ORM\Entity()
 * @ORM\Table("entity_alias")
 * @UniqueEntity("entityId")
 */
class Alias
{
    /**
     * @var string
     * @Assert\NotBlank()
     * @ORM\Column(type="bigint", nullable=false)
     */
    private $entityId;
    /**
     * @var string
     *
     * @ORM\Id
     * @ORM\Column(type="string", nullable=false)
     */
    private $alias;

    /**
     * Alias constructor.
     *
     * @param $objectId
     * @param $alias
     */
    public function __construct($objectId, $alias)
    {
        $this->alias = $alias;
        $this->objectId = $objectId;
    }
    /**
     * @return mixed
     */
    public function __toString()
    {
        $sting = $this->alias;
        return (string) $sting;
    }
}

AliasableTrait:

trait AliasableTrait
{
   /**
    * @ORM\OneToOne(targetEntity="Alias", cascade={"persist", "remove"}, orphanRemoval=true)
    * @ORM\JoinColumn(name="id", referencedColumnName="entity_id", onDelete="CASCADE")
    * @var Alias
    */
    protected $alias;
    /**
     * @return string|int
     */
    abstract public function getId();
    /**
     * @param string $alias
     */
    public function setAlias(string $alias)
    {
        $this->alias = new Alias($this->getId(), $alias);
    }
    /**
     * @return string
     */
    public function getAlias() : string
    {
        return (string) $this->alias;
    }
    public function dropAlias()
    {
        $this->alias = null;
    }
}

Right now I am getting Missing value for primary key alias on Alias.

Question:
Is it possible to do?

Originally created by @ihorsamusenko on GitHub (Nov 20, 2016). **Case**: I have plenty of entities in the system. I also have `entity_alias` table which consist of two fields: alias (pk), entity_id. (NOTE: in my database all the entities have a unique id across the whole database, that is why I do not have entity_type field in `entity_alias` table). **Goal**: Create a trait which can be used to any entity and which provides an ability to set, get and drop alias for an entity. **Code example**: Alias entity: ``` /** * Class Alias * * @ORM\Entity() * @ORM\Table("entity_alias") * @UniqueEntity("entityId") */ class Alias { /** * @var string * @Assert\NotBlank() * @ORM\Column(type="bigint", nullable=false) */ private $entityId; /** * @var string * * @ORM\Id * @ORM\Column(type="string", nullable=false) */ private $alias; /** * Alias constructor. * * @param $objectId * @param $alias */ public function __construct($objectId, $alias) { $this->alias = $alias; $this->objectId = $objectId; } /** * @return mixed */ public function __toString() { $sting = $this->alias; return (string) $sting; } } ``` AliasableTrait: ``` trait AliasableTrait { /** * @ORM\OneToOne(targetEntity="Alias", cascade={"persist", "remove"}, orphanRemoval=true) * @ORM\JoinColumn(name="id", referencedColumnName="entity_id", onDelete="CASCADE") * @var Alias */ protected $alias; /** * @return string|int */ abstract public function getId(); /** * @param string $alias */ public function setAlias(string $alias) { $this->alias = new Alias($this->getId(), $alias); } /** * @return string */ public function getAlias() : string { return (string) $this->alias; } public function dropAlias() { $this->alias = null; } } ``` Right now I am getting Missing value for primary key alias on Alias. **Question**: Is it possible to do?

admin commented

2026-01-22 15:04:45 +01:00

@malutanpetronel commented on GitHub (May 11, 2023):

did you manage to make it work ?

@malutanpetronel commented on GitHub (May 11, 2023): did you manage to make it work ?

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Reference: doctrine/archived-orm#5332