Relations

2 grands types de relations existent :

• manyToOne/oneToMany
• manyToMany

Correspond aux associations hiérarchiques de type CIF.
manyToOne et oneToMany correspondent au même type d'association, mais vus de chaque côté de la relation.

Exemple :

Chaque produit appartient à une catégorie :

// ...
class Product{
    // ...

    /**
     * @ORM\ManyToOne(targetEntity="App\Entity\Category", inversedBy="products")
     * @ORM\JoinColumn(nullable=true)
     */
    private $category;

    public function getCategory(): Category
    {
        return $this->category;
    }

    public function setCategory(Category $category)
    {
        $this->category = $category;
    }
}

Chaque catégorie peut contenir plusieurs projets :

// ...
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;

class Category{
    // ...

    /**
     * @ORM\OneToMany(targetEntity="App\Entity\Product", mappedBy="category")
     */
    private $products;

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

    /**
     * @return Collection|Product[]
     */
    public function getProducts(){
        return $this->products;
    }
}

manyToOne : Affichage de la catégorie d'un produit :

use App\Entity\Product;
// ...

/**
 * @Route("/product/{id}", name="product_show")
 */
public function showAction(Product $product){

    $categoryName = $product->getCategory()->getName();

    // ...
}

<sxh php;title:src/Controller/ProductController.php>

… use App\Entity\Category; use App\Entity\Product; use Symfony\Component\HttpFoundation\Response; class ProductController extends Controller{ /** * @Route(“/product”, name=“product”) */ public function index() { $category = new Category(); $category→setName('Computer Peripherals'); $product = new Product(); $product→setName('Keyboard'); $product→setPrice(19.99); $product→setDescription('Ergonomic and stylish!'); relates this product to the category

      $product->setCategory($category);

      $em = $this->getDoctrine()->getManager();
      $em->persist($category);
      $em->persist($product);
      $em->flush();

      return new Response(
          'Saved new product with id: '.$product->getId()
          .' and new category with id: '.$category->getId()
      );
  }

}