Orders.php

<?php

namespace App\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\ORM\Mapping\ManyToOne;
use Doctrine\ORM\Mapping\OneToMany;
use Doctrine\ORM\Mapping\ManyToMany;
use App\Entity\Products;

/**
 * @ORM\Entity(repositoryClass="App\Repository\OrdersRepository")
 */
class Orders
{
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $customer;

    /**
     * @ORM\ManyToMany(targetEntity="App\Entity\Products", mappedBy="fkorders",cascade={"persist"})
     */
    private $productsCollection;

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

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

    public function getCustomer(): ?string
    {
        return $this->customer;
    }

    public function setCustomer(string $customer): self
    {
        $this->customer = $customer;

        return $this;
    }

    /**
     * @return Collection|Products[]
     */
    public function getProductsCollection(): Collection
    {
        return $this->productsCollection;
    }

    public function addProductsCollection(Products $productsCollection): self
    {
        if (!$this->productsCollection->contains($productsCollection)) {
    
            $this->productsCollection[] =  $productsCollection;
            $productsCollection->setFkorders($this);
          
        }

        return $this;
    }

    public function removeProductsCollection(Products $productsCollection): self
    {
        if ($this->productsCollection->contains($productsCollection)) {
            $this->productsCollection->removeElement($productsCollection);
            // set the owning side to null (unless already changed)
            if ($productsCollection->getFkorders() === $this) {
                $productsCollection->setFkorders(null);
            }
        }

        return $this;
    }
}

OrdersController.php

<?php

namespace App\Controller;

use App\Entity\Orders;
use App\Form\OrdersType;
use App\Repository\OrdersRepository;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;
use App\Form\ProductsListType;
use App\Form\ProductsType;
use App\Entity\Products;
use App\Repository\ProductsRepository;
use App\Form\OrdersCompleteType;
use Doctrine\Common\Collections\ArrayCollection;

/**
 * @Route("/orders")
 */
class OrdersController extends Controller {

    /**
     * @Route("/", name="orders_index", methods="GET")
     */
    public function index(OrdersRepository $ordersRepository): Response {
        return $this->render('orders/index.html.twig', ['orders' => $ordersRepository->findAll()]);
        }

        /**
         * @Route("/new", name="orders_new", methods="GET|POST")
         */
        public function new(Request $request): Response
        {
        $order = new Orders();

        $form = $this->createForm(OrdersType::class, $order);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
        $em = $this->getDoctrine()->getManager();
        $em->persist($order);
        $em->flush();

        return $this->redirectToRoute('orders_show', ['id' => $order->getId()]);
        }

        return $this->render('orders/new.html.twig', [
                    'order' => $order,
                    'form' => $form->createView(),
        ]);
    }

    /**
     * @Route("/{id}", name="orders_show", methods="GET")
     */
    public function show(Request $request, Orders $order): Response {
        $products = new Products();
        //echo $order->getId();

        $form = $this->createForm(ProductsListType::class, $products, array('action' => $this->generateUrl('order_product', array('id' => $order->getId()))));
        $form->handleRequest($request);
        return $this->render('orders/show.html.twig', [
                    'order' => $order,
                    'form' => $form->createView(),
        ]);
    }

    /**
     * @Route("/{id}/product", name="order_product", methods="POST")
     */
    public function addProducts(Request $request, Orders $orders): Response {
        
        $product = new Products();
        $form = $this->createForm(ProductsListType::class, $product);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            
            //Orders::$productsCollection = $productList;
            $orders->addProductsCollection($product);
            $em = $this->getDoctrine()->getManager();

            $em->persist($product);
            $em->flush();
        }

        return $this->redirectToRoute('orders_show', array('id' => $orders->getId()));
    }

    /**
     * @Route("/{id}/edit", name="orders_edit", methods="GET|POST")
     */
    public function edit(Request $request, Orders $order): Response {
        $form = $this->createForm(OrdersType::class, $order);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $this->getDoctrine()->getManager()->flush();

            return $this->redirectToRoute('orders_edit', ['id' => $order->getId()]);
        }

        return $this->render('orders/edit.html.twig', [
                    'order' => $order,
                    'form' => $form->createView(),
        ]);
    }

    /**
     * @Route("/{id}", name="orders_delete", methods="DELETE")
     */
    public function delete(Request $request, Orders $order): Response {
        if ($this->isCsrfTokenValid('delete' . $order->getId(), $request->request->get('_token'))) {
            $em = $this->getDoctrine()->getManager();
            $em->remove($order);
            $em->flush();
        }

        return $this->redirectToRoute('orders_index');
    }

}

Products.php

<?php

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\ORM\Mapping\ManyToMany;

/**
 * @ORM\Entity(repositoryClass="App\Repository\ProductsRepository")
 */
class Products
{
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $designation;

    /**
     * @ORM\Column(type="float")
     */
    private $price;

    /**
     * @ORM\Column(type="text", nullable=true)
     */
    private $description;

    /**
     * @ORM\ManyToMany(targetEntity="App\Entity\Orders", inversedBy="productsCollection",cascade={"persist"})
     * @ORM\JoinColumn(nullable=false)
     */
    private $fkorders;

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

    public function getDesignation(): ?string
    {
        return $this->designation;
    }

    public function setDesignation(string $designation): self
    {
        $this->designation = $designation;

        return $this;
    }

    public function getPrice(): ?float
    {
        return $this->price;
    }

    public function setPrice(float $price): self
    {
        $this->price = $price;

        return $this;
    }

    public function getDescription(): ?string
    {
        return $this->description;
    }

    public function setDescription(?string $description): self
    {
        $this->description = $description;

        return $this;
    }

    public function getFkorders(): ?Orders
    {
        return $this->fkorders;
    }

    public function setFkorders(?Orders $fkorders): self
    {
        $this->fkorders = $fkorders;

        return $this;
    }
}