How to populate a dropdown in Symfony 3 - php

Question

I am a newbie in symfony and i have decided to explore symfony 3. I have two models: products and category and I want to populate a dropdown in a new product form with all the categories. How can i do this pls?
Below is what have done so far:
<?php
Product Model:
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\ORM\Persisters\Entity;
use Doctrine\ORM\Mapping\Column;
/**
* #ORM\Entity
* #ORM\Table(name="product")
*/
class Product
{
/**
* #ORM\Column(type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="Category", inversedBy="products")
* #ORM\JoinColumn(name="category_id", referencedColumnName="id")
*/
private $category;
/**
* #ORM\Column( type ="string", length=100)
*/
private $name;
/**
* #ORM\Column(type="decimal", scale=2)
*/
private $price;
/**
* #ORM\Column(type="text")
*/
private $description;
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* #param string $name
*
* #return Product
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* #return string
*/
public function getName()
{
return $this->name;
}
/**
* Set price
*
* #param string $price
*
* #return Product
*/
public function setPrice($price)
{
$this->price = $price;
return $this;
}
/**
* Get price
*
* #return string
*/
public function getPrice()
{
return $this->price;
}
/**
* Set description
*
* #param string $description
*
* #return Product
*/
public function setDescription($description)
{
$this->description = $description;
return $this;
}
/**
* Get description
*
* #return string
*/
public function getDescription()
{
return $this->description;
}
/**
* Set category
*
* #param \AppBundle\Entity\Category $category
*
* #return Product
*/
public function setCategory(\AppBundle\Entity\Category $category = null)
{
$this->category = $category;
return $this;
}
/**
* Get category
*
* #return \AppBundle\Entity\Category
*/
public function getCategory()
{
return $this->category;
}
}
namespace AppBundle\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
/**
* Category
*
* #ORM\Table(name="category")
* #ORM\Entity(repositoryClass="AppBundle\Repository\CategoryRepository")
*/
class Category
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\OneToMany(targetEntity="Product", mappedBy="category")
* #ORM\JoinColumn(name="category_id", referencedColumnName="id")
*/
private $products;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255)
*/
private $name;
public function __construct()
{
$this->products= new ArrayCollection();
}
/**
* Get id
*
* #return int
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* #param string $name
*
* #return Category
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* #return string
*/
public function getName()
{
return $this->name;
}
/**
* Add product
*
* #param \AppBundle\Entity\Product $product
*
* #return Category
*/
public function addProduct(\AppBundle\Entity\Product $product)
{
$this->products[] = $product;
return $this;
}
/**
* Remove product
*
* #param \AppBundle\Entity\Product $product
*/
public function removeProduct(\AppBundle\Entity\Product $product)
{
$this->products->removeElement($product);
}
/**
* Get products
*
* #return \Doctrine\Common\Collections\Collection
*/
public function getProducts()
{
return $this->products;
}
}
<
?php
DefaultController:
namespace AppBundle\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\Form\Extension\Core\Type\NumberType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\Extension\Core\Type\TextareaType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use AppBundle\Entity\Category;
use AppBundle\Entity\Product;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
class DefaultController extends Controller
{
/**
* #Route("/product_new")
*/
public function newAction(Request $request)
{
$category = new Category();
$product = new Product();
$form = $this->createFormBuilder($product)
->add('name', TextType::class)
->add('price', NumberType::class)
->add('description', TextareaType::class)
->add('category', EntityType::class, array(
'class' => 'AppBundle:Category',
'choices' => $category->getProducts(),
))
->add('save', SubmitType::class, array('label'=>'Create New Product'))
->getForm();
$form->handleRequest($request);
if($form->isSubmitted() && $form->isValid())
{
// $category->setName( $request->request->get('category'));
//$product->setCategory( new Category('Cat1'));
$product = $form->getData();
$entityManager = $this->getDoctrine()->getManager();
//$entityManager->persist($category);
$entityManager->persist($product);
$entityManager->flush();
return $this->render('product/product_status.html.twig',
['msg' =>'Saved new product with id ' . $product->getId()]);
}else
{
return $this->render('product/product_new.html.twig', ['form'=> $form->createView(),]);
}
}
/**
* #Route("/new_product", name="new_product")
*/
public function createAction(Request $request)
{
$product = new Product();
$product->setName("Keyboard");
$product->setPrice(19.9);
$product->setDescription("Ergonomic and stylish!");
$entityManager = $this->getDoctrine()->getManager();
$entityManager->persist($product);
$entityManager->flush();
return $this->render('product/product_status.html.twig',
['msg' =>'Saved new product with id ' . $product->getId()]);
}
/**
* #Route("/show_product/{productId}")
*/
public function showAction($productId)
{
$product = $this->getDoctrine()->getRepository('AppBundle:Product')->find($productId);
if(!$product)
{
$this->createNotFoundException("No Product was found with Id". $productId);
}
return $this->render('product/product_search.html.twig', ['product' => $product]);
}
/**
* #Route("/product_list", name ="productlist")
*/
public function listAction()
{
$products = $this->getDoctrine()->getRepository('AppBundle:Product')->findAll();
if(!$products)
{
$this->createNotFoundException("No Product was found ");
}
return $this->render('product/product_list.html.twig', ['products' => $products]);
}
/**
* #Route("/update_product/{productId}", name ="updateproduct")
*/
public function updateAction($productId)
{
$entityManager = $this->getDoctrine()->getManager();
$product = $this->getDoctrine()->getRepository('AppBundle:Product')->find($productId);
if($product)
{
$product->setName("Project");
$product->setDescription("Sony Projector with LCD light");
$entityManager->flush();
return $this->redirectToRoute('productlist');
}
}
/**
* #Route("/delete_product/{productId}", name ="deleteproduct")
*/
public function deleteAction($productId)
{
$entityManager = $this->getDoctrine()->getManager();
$product = $this->getDoctrine()->getRepository('AppBundle:Product')->find($productId);
if($product)
{
$entityManager->remove($product);
$entityManager->flush();
return $this->redirectToRoute('productlist');
}
}
}

Answer 1

You can use query_builder option like below. You can adapt it to your application. Full example is here: Full webform style CRUD example with an embedded associated entity in symfony
....
private $country;
public function __construct()
{
$this->country = [
....
'class' => 'FootballFrontendBundle:Country',
'query_builder' => function (EntityRepository $repo)
{
return $repo->createQueryBuilder('c')->orderBy('c.name', 'ASC');
}
];
}
public function buildForm(FormBuilderInterface $builder, array $options = [])
{
$builder
....
->add('country', 'entity', $this->country);
}
....