Question

In my model I have

Terrain.php

/**
* @ORM\Entity
* @ORM\HasLifecycleCallbacks()
*/
class Terrain
{

 /**
  * @var lots
  *
  * @ORM\OneToMany(targetEntity="Lot", mappedBy="terrain")
  */
  private $lotes;

  /**
   * @ORM\PreRemove
   */
  public function deleteAllLots()
  {
    $lots = $this->getLots();

    foreach ($lots as $lot) {
        $this->lots->removeElement($lot);
    }
  }

}

Lot.php

/**
* @ORM\Entity
* @ORM\HasLifecycleCallbacks()
*/
class Lot
{

 /**
  * @var Terrain
  *
  * @ORM\ManyToOne(targetEntity="Terrain", inversedBy="lots")
  * @ORM\JoinColumns({
  *   @ORM\JoinColumn(name="terrain_id", referencedColumnName="id")
  * })
  */
  var $terrain

}

Lot

I’m trying to delete a terrain, but formerly i deleted all lots associated with it. when i try to delete a Terrain, i get an error SQLSTATE[23000]: Integrity constraint violation

Answer 1

You still have a reference from lots to terrain on deleting, that’s why you have an Integrity constrait violation.

Try this :

/**
* @ORM\Entity
* @ORM\HasLifecycleCallbacks()
*/
class Terrain
{
    /**
    * @var lots
    *
    * @ORM\OneToMany(targetEntity="Lot", mappedBy="terrain")
    */
    private $lotes;

    /**
    * @ORM\PreRemove
    */
    public function deleteAllLots()
    {
        $lots = $this->getLots();

        foreach ($lots as $lot) {
            $this->lots->removeElement($lot);
            $lot->terrain = null; //$lot->setTerrain(null); will be better, try to add getters and setters
        }
    }
}

If you want to delete lots from database, you should use cascade property of OneToMany relation (One-To-Many reference on doctrine-project.com), like this :

/**
* @ORM\Entity
* @ORM\HasLifecycleCallbacks()
*/
class Terrain
{
    /**
    * @var lots
    *
    * @ORM\OneToMany(targetEntity="Lot", mappedBy="terrain", cascade={"remove"})
    */
    private $lotes;
}

On Terrainremove, all lots will be removed.