Symfony : Error when create a Twig Extension function : Call to a member function findAll() on null

Question

I want to get the list of all the customers to put it in a global variable.

For that, I configure the twig.yaml file:

twig:
default_path: '%kernel.project_dir%/templates'
globals:
    orders: '@App\Twig\OrderExtension'

Then, I create a file OrderExtension.php in the folder src>Twig

<?php

namespace App\Twig;

use App\Entity\Orders;
use Twig\TwigFunction;
use Twig\Extension\AbstractExtension;
use Doctrine\Persistence\ManagerRegistry;

class OrderExtension extends AbstractExtension {
    private $em;

    public function __construt(ManagerRegistry $em) {
        $this->em = $em;
    }

    public function getFunctions(): array {
        return [
            new TwigFunction('orders', [$this, 'getOrders'])
        ];
    }

    public function getOrders() {
        return $this->em->getRepository(Orders::class)->findAll();

    }

    
}

But I have this error: Call to a member function getRepository() on null

I tested the global "orders" by changing the getOrders function and asking it to return a simple string.

I called the global in my base.html.twig file and it displayed the desired string.

How do I make sure I get an array of my orders?

Answer 1

First of all dump $this->em inside your function and make sure that the connection with database exists.

Maybe do not define it as globals, but just call it as a function

{{ orders() }}

Then you can iterate through this

{% for order in orders() %}
{% endfor %}