Symfony2 - extending entities, abstract entity

Question

I have 2 entities with the same fields - parent, children, order. Actually it is a mechanism and this 3 fields not applicable to content of this entity - like name, title, c

Answer 1

i would make an abstract class with doctrines @MappedSuperClass annotation and shared fields and the entities extend them

here is an example with a shared created_at field

namespace Your\CoreBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\ORM\Mapping\MappedSuperclass;



/**
 * Abstract base class to be extended by my entity classes with same fields
 *
 * @MappedSuperclass
 */
abstract class AbstractEntity {

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

    /**
     * @ORM\Column(name="created_at", type="datetime")
     */
    private $createdAt;


    /**
     * Get id
     * @return integer
     */
    public function getId() {
        return $this->id;
    }

    /**
     * Get createdAt
     * @return \DateTime
     */
    public function getCreatedAt() {
        return $this->createdAt;
    }

    /**
     * Set createdAt
     *
     * @param \DateTime $createdAt
     *
     * @return AbstractEntity
     */
    public function setCreatedAt($createdAt)
    {
        $this->createdAt = $createdAt;

        return $this;
    }

} 

your entities both extend this class like:

class YourEntityClass extends AbstractEntity
{

in YourEntityClass the $id property must be "protected"