Symfony inject service Class without call her constructor

0
votes

Hi i want to inject a service Class without call her constructor, be cose i havent yet the argument to pass to this constructor class injected.

Exemple:

services:
your.service.name:
    class:  AppBundle\Services\YourClassName
    arguments:  ['@doctrine.services.paginator']

doctrine.services.paginator:
  class: Doctrine\ORM\Tools\Pagination\Paginator
  public: false

return error

Type error: Too few arguments to function Doctrine\ORM\Tools\Pagination\Paginator::__construct(), 0 passed in ... and at least 1 expected

2
phpsymfonyservice
Why are you wanting to inject the Paginator without calling the constructor? I have a feeling your trying to go about something the wrong way. - qooplmao
can i do "new Paginator()" inside service ? - spinoza

2 Answers

2
votes

You can use setter injection, which is optional, and not really recommended, but I won't go deep about that.

Example:

<?php

class YourClassName 
{
    private $paginator;

    public function setPaginator(PaginatorInterface $paginator)
    {
        $this->paginator = $paginator;
    }

    public function getPaginator()
    {
        if ($this->paginator instanceof PaginatorInterface) {
            return $this->paginator;
        }

        throw new \RuntimeException('Paginator is not defined');
    }
}

Then you can inject your service without specifying paginator as an argument:

services:
    your.service.name:
        class:  AppBundle\Services\YourClassName

and instead inject it in a runtime:

$this->get('your.service.name')->setPaginator($paginator);

In case, if you need inject paginator also with container, you can use calls argument with service, more in docs.

If you need to get new instance each time you get service from container, you can use shared argument, more in docs.

1
votes

It's a bit hard to instantiate a class without using the constructor,
PHP documentation says :

PHP 5 allows developers to declare constructor methods for classes. Classes which have a constructor method call this method on each newly-created object, so it is suitable for any initialization that the object may need before it is used.

PHP constructor documentation

If you want to use the paginator without injecting dependencies, you could follow the doctrine documentation :

Doctrine paginator documentation

Basically you insert use statement in your repository.

use Doctrine\ORM\Tools\Pagination\Paginator;

And then use an object of the Paginator Class with your query :

$qb = $this->CreateQueryBuilder('u');
// ... build your query here...
$qb->getQuery();
$paginator = new Paginator($qb, false);
$count = count($paginator);
return array($paginator, $count); // Process the results in your controller

Hope this helps