Symfony 5 - OneToMany 未出现在我的 mysql 数据库中

Question

So I have two tables: one is "cable" -> the main one AND the other one is "color"

So i created an entity inside cable called colors linked to the color table with the OneToMany relation. But the problem is that the migration:migrate does not appear in my database when the other ManyToOne relation does.

Here it what's inside my migration.php file:

`

final class Version20210411225338 extends AbstractMigration
{
    public function getDescription() : string
    {
        return '';
    }

    public function up(Schema $schema) : void
    {
        // this up() migration is auto-generated, please modify it to your needs
       $this->addSql('ALTER TABLE cables DROP FOREIGN KEY FK_9A9430025ED47289');
       $this->addSql('DROP INDEX IDX_9A9430025ED47289 ON cables');
       $this->addSql('ALTER TABLE cables DROP couleurs_id');
       $this->addSql('ALTER TABLE colors ADD cables_id INT NOT NULL');
       $this->addSql('ALTER TABLE colors ADD CONSTRAINT FK_C2BEC39F4DE1706A FOREIGN KEY (cables_id) REFERENCES cables (id)');
       $this->addSql('CREATE INDEX IDX_C2BEC39F4DE1706A ON colors (cables_id)');
    }

    public function down(Schema $schema) : void
    {
        // this down() migration is auto-generated, please modify it to your needs
       $this->addSql('ALTER TABLE cables ADD couleurs_id INT NOT NULL');
       $this->addSql('ALTER TABLE cables ADD CONSTRAINT FK_9A9430025ED47289 FOREIGN KEY (couleurs_id) REFERENCES colors (id)');
       $this->addSql('CREATE INDEX IDX_9A9430025ED47289 ON cables (couleurs_id)');
       $this->addSql('ALTER TABLE colors DROP FOREIGN KEY FK_C2BEC39F4DE1706A');
       $this->addSql('DROP INDEX IDX_C2BEC39F4DE1706A ON colors');
       $this->addSql('ALTER TABLE colors DROP cables_id');
    }
}

` My Cable.php file:

`

/**
  * @return Collection|Colors[]
  */
    public function getCouleurs(): Collection
    {
        return $this->couleurs;
    }

    public function addCouleur(Colors $couleur): self
    {
        if (!$this->couleurs->contains($couleur)) {
           $this->couleurs[] = $couleur;
           $couleur->setCables($this);
        }

        return $this;
    }

    public function removeCouleur(Colors $couleur): self
    {
        if ($this->couleurs->removeElement($couleur)) {
           // set the owning side to null (unless already changed)
           if ($couleur->getCables() === $this) {
           $couleur->setCables(null);
            }
        }

        return $this;
    }

/**
  * @ORM\OneToMany(targetEntity=Colors::class, mappedBy="cables")
  */
    private $couleurs;

`

And my colors.php file:

`

/**
  * @ORM\OneToMany(targetEntity=Cables::class, mappedBy="couleurs")
  */
    private $cables;


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

`

Thanks for your help:)

Answer 1

You have OneToMany on both sides, that doesn't work.
I think you mean to do ManyToMany where Colors can be referenced by many Cables and a Cable can have many Colors .

Since you have a collection on each side and you manage the relation from Cable , You should have a many-to-many-bidirectional relation with Cable as the owning side. Try adjusting your mapping as follows.

Cable:

  /**
   * @ORM\ManyToMany(targetEntity=Colors::class, inversedBy="cables")
   * @JoinTable(name="cables_colors")
   */
  private $couleurs;

Colors:

  /**
   * @ORM\ManyToMany(targetEntity=Cables::class, mappedBy="couleurs")
   */
  private $cables;