Symfony 4 when entity field change, change field in another entity

Question

I have two entities for example:

class Dog
{

    /**
     * @var House
     *
     * @ORM\ManyToOne(targetEntity="House")
     * @ORM\JoinColumns({
     *   @ORM\JoinColumn(name="house_id", referencedColumnName="id")
     * })
     */
    private $house;
}

class House
{

     /**
     * @var ArrayCollection|null
     * @ORM\ManyToMany(targetEntity="Dog",cascade={"persist"})
     * @ORM\JoinColumns({
     * @ORM\JoinColumn(name="dog_id", referencedColumnName="id", nullable=true)
     * })
     */
    protected $dog;
}

I need to throw an event if field house in Entity Dog was update (set or remove) then add or remove field dog in Entity House. Can anyone show me how do this ?

score 0 · Answer 1 · answered Dec 21 '19 at 18:36

Doctrine will do this for you but depending on the cascade option. But your annotations are not correct. In the Dog entity you have annotation for a ManyToOne and in the House entity for a ManyToMany relation. But you should choose between

ManyToOne - OneToMany
ManyToMany - ManyToMany

Take a look into the Doctrine's association mapping to read about all the types of associations and how to define them.

If you are using Symfony (4 or 5) you should use the commandline make tool to add properties and methods with all the annotations, even for relations.

bin/console make:entity Dog

Type relation when asked for the Field type and you will have to answer some additional questions.

gave a new answer because i can t place code examples in comments. — Frank B, Dec 22 '19 at 14:09

score 0 · Answer 2 · answered Dec 22 '19 at 14:08

You must call $dog->setHouse($this); from the addDog method. If you used the commandline then below class House would be generated for you.

class House
{
    // ...

    /**
     * @ORM\OneToMany(targetEntity="App\Entity\Dog", mappedBy="house")
     */
    private $dogs;

    public function __construct()
    {
        $this->dogs = new ArrayCollection();
    }

    public function getId(): ?int
    {
        return $this->id;
    }

    /**
     * @return Collection|Dog[]
     */
    public function getDogs(): Collection
    {
        return $this->dogs;
    }

    public function addDog(Dog $dog): self
    {
        if (!$this->dogs->contains($dog)) {
            $this->dogs[] = $dog;
            $dog->setHouse($this);       // <-- here you go
        }

        return $this;
    }

    public function removeDog(Dog $dog): self
    {
        if ($this->dogs->contains($dog)) {
            $this->dogs->removeElement($dog);
            // set the owning side to null (unless already changed)
            if ($dog->getHouse() === $this) {
                $dog->setHouse(null);
            }
        }

        return $this;
    }
}

Same thing counts for removeDog() method.

I Added this and inversedBy to Entity Dog.But if I save in House side, values still not saves and removes. — DODO, Dec 23 '19 at 10:28
also if you add cascade={"persist","remove"}) to the annotation ? — Frank B, Dec 23 '19 at 17:08

Symfony 4 when entity field change, change field in another entity

2 Answers2