Symfony create new object many to one error call undefined method - doctrine-orm

Question

I have set up a many to one relation and want to add a new product-object linked to its category. Related to this I have 2 questions:
I get stuck on saving the category object to the new product. Tried different options and read related questions here. At this moment I am getting the error:
Attempted to call an undefined method named "getCategory" of class "AppBundle\Controller\ProductController".
I do have the method getCategory in my Product class.
What am I missing here?
Another thing I would like to know is do I need to pass the category-id in the url to get the related products for that category?
I have a category class:
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;
/**
* #ORM\Entity
* #ORM\Table(name="category")
*/
class Category
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $cat_id;
...
/**
* #ORM\OneToMany(targetEntity="Product", mappedBy="category")
*/
private $products; ...
public function __construct()
{
$this->products = new ArrayCollection();
}
and product class:
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Category;
use Doctrine\Common\Collections\ArrayCollection;
/**
* #ORM\Entity
* #ORM\Table(name="product")
*/
class Product
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $prd_id;
/**
* #var Category
*
* #ORM\ManyToOne(targetEntity="Category", inversedBy="products")
* #ORM\JoinColumn(name="cat_id", referencedColumnName="cat_id", nullable=false)
*/
private $category;
....
/**
* Set category
*
* #param \AppBundle\Entity\Category $category
*
* #return Product
*/
public function setCategory(\AppBundle\Entity\Category $category)
{
$this->category = $category;
return $this;
}
/**
* Get category
*
* #return \AppBundle\Entity\Category
*/
public function getCategory()
{
return $this->category;
}
From my list of categories "/categories" I link the categories to the productlist "/cat1/product" (<-- do I need to pass the category-id here?). There I want to add a new product and call the following action in my ProductController:
namespace AppBundle\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Response;
use AppBundle\Entity\Product;
use AppBundle\Form\ProductType;
use Symfony\Component\HttpFoundation\Request;
class ProductController extends Controller
{
/**
* #Route("/cat{cat_id}/product/new", name="newproduct")
*/
public function newAction(Request $request, $cat_id)
{
$product = new Product();
$form = $this->createForm(ProductType::class, $product);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$category = $this->getCategory();
$product->setCategory($category);
$em = $this->getDoctrine()->getManager();
$em->persist($product);
$em->flush();
return $this->redirectToRoute('productlist');
}
return $this->render('product/new.html.twig', array(
'form' => $form->createView(),
'cat_id' => $cat_id,
));
}
Suggestions appreciated!

Answer 1

when you do :
$category = $this->getCategory();
$this represent your productController, it is the reason of the undefined method error. to get the category object you must do :
$categoryRepository = $this->getDoctrine()->getRepository('AppBundle:Category');
$product->setCategory($categoryRepository->find($cat_id));
hope that may help you.