Doctrine cascade persist from inversed side - symfony

Question

I have a "many-to-many" relation with an association table. The function calculDesCouts(), from the parent table is calculating the total cost of ingredients, and persist this info in a field. Actually, because of the owning and inversed sides of the relations, I'm not able to cascade persist the parent table when an ingredient price has changed.
What is the proper way to do this? I mean, when a child row is updated, how to trigger the persist callback from the parent table? I know I can do it in my controller, with a loop on all recipes using this ingredient, but I would really like to do it on the ORM layer...
This is my parent entity, with a lifecycle callback on the calculDesCouts :
<?php
/**
* #ORM\Table(name="recette")
* #ORM\Entity
* #ORM\HasLifecycleCallbacks
*/
class Recette
{
/**
* #ORM\Column(type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\OneToMany(targetEntity="\My\AcmeBundle\Entity\RecetteIngredientAssociation", mappedBy="recette", cascade={"persist"})
*/
protected $recette_ingredient_associations;
/**
* #ORM\Column(type="decimal", scale=2, nullable=true)
*/
private $cout_nourriture;
/**
* #ORM\PrePersist
* #ORM\PreUpdate
*/
public function calculDesCouts()
{
$this->cout_nourriture = 0;
foreach ($this->recette_ingredient_associations as $ria) {
$this->cout_nourriture += $ria->getIngredient()->getPrix() * $ria->getQuantite();
}
}
}
This is my association entity:
<?php
/**
* #ORM\Table(name="recette_ingredient_association")
* #ORM\Entity
*/
class RecetteIngredientAssociation
{
/**
* #ORM\Column(type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="\My\AcmeBundle\Entity\Recette", inversedBy="recette_ingredient_association")
* #ORM\JoinColumn(name="recette_id", referencedColumnName="id")
*
*/
private $recette;
/**
* #ORM\ManyToOne(targetEntity="\My\AcmeBundle\Entity\Ingredient", inversedBy="recette_ingredient_association")
* #ORM\JoinColumn(name="ingredient_id", referencedColumnName="id")
*/
private $ingredient;
/**
* #ORM\Column(type="decimal", scale=2, nullable=false)
*/
private $quantite;
}
And this is my child entity:
<?php
/**
* #ORM\Table(name="ingredient")
* #ORM\Entity
* #ORM\HasLifecycleCallbacks
*/
class Ingredient
{
/**
* #ORM\Column(type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\Column(type="decimal", scale=2, nullable=true)
*/
private $prix;
/**
* #ORM\OneToMany(targetEntity="\My\AcmeBundle\Entity\RecetteIngredientAssociation", mappedBy="ingredient")
*/
protected $recette_ingredient_associations;
}

Answer 1

I don't know how to make it on ORM level, but I would do it on Symfony2 layer.
To make this what you need is to create an EventListener which will in case of Ingredient's update call Recette's calculDesCouts.
Like declare a service:
app.ingredient_listener_update:
class: AppBundle\Listener\IngredientPriceListener
tags:
- { name: doctrine.event_listener, event: postUpdate }
and in this AppBundle\Listener\IngredientPriceListener make a method
public function postUpdate(LifecycleEventArgs $args)
{
$entity = $args->getEntity();
$em = $args->getEntityManager();
if ($entity instanceof Ingredient) {
foreach ($entity->get_recette_ingredient_associations() as $association)
foreach ($association->get_recettes() as $recette) {
$recette->calculDesCouts();
$em->persist($recette);
}
}
}