gistfile1.php

<?php

/**
 * We want "clone/duplicate" -EntityM- keeping fk1 objec and cloning fk2. We are setting fk2 id
 * to null ($fk2->setId(null)) to force EntityManger to persist new entity. But didn't work.
 * Also doing $fk2 = new EntityB(). We are trying to do it in __clone method following the 
 * recomendations in Doctrine documentation, and the EntityManager throws something like that:
 * 
 * "Doctrine\ORM\ORMException : Entity of type EntityM has identity through a foreign entity EntityB,
 * however this entity has no identity itself.You have to call EntityManager#persist() on the related 
 * entity and make sure that an identifier was generated before trying to persist EntityM'.
 * In case of Post Insert ID Generation (such as MySQL Auto-Increment or PostgreSQL SERIAL) 
 * this means you have to call EntityManager#flush() between both persist operation".
 * 
 * If we call EntityManager inside __clone (bad practise) doing a 
 *   $em->persist($fk2)
 *   $em->flush()
 * 
 * All works fine. But it is not a solution.
 * 
 * 
 * After researching a bit, and specilly your comments, we are reconsiderating 
 * create a service that handle all logic to "clone or duplicate" from stractch:
 * creating and setting values.
 * 
 * Comments are appreciated. Thank you.
 */ 
class EntityM
{
    /**
     * ORM\Id
     * @ORM\ManyToOne(targetEntity="EntityA", cascade={"persist"})
     */
    protected $fk1;

    /**
     * @ORM\Id
     * @ORM\ManyToOne(targetEntity="EntityB", cascade={"persist"})
     */
    protected $fk2;

    /**
     * @ORM\Column(name="property1", type="string")
     */
    protected $property;
    
    // More properties
    
    // ...
    
    // Getters and setters
    
    // ...
}