How to call Entity Manager in a constructor?

问题

I've been trying to call Entity Manager in a constructor:

function __construct()
{
    $this->getDoctrine()->getEntityManager();
    ...

but, as I've seen in this answer: Stackoverflow question, it can't be done.

So I wonder if there is a way to achieve it, as I have to call it often, and want to do some stuff in the constructor after getting the repository.

Edit:

I've tried with @MKhalidJunaid answer:

//src/MSD/HomeBundle/Resources/config/services.yml
services:
  imageTransController.custom.service:
    class:  MSD\HomeBundle\Controller\ImageTransController
    arguments: 
        EntityManager: "@doctrine.orm.entity_manager"

//app/config/config.php
imports:
- { resource: parameters.yml }
- { resource: security.yml }
- { resource: doctrine_extensions.yml }
- { resource: "@MSDHomeBundle/Resources/config/services.yml" }

//src/MSD/HomeBundle/Controller/ImageTransController.php
namespace MSD\HomeBundle\Controller;

use Doctrine\ORM\EntityManager;
use MSD\HomeBundle\Entity\Imagen as Imagen;
use MSD\HomeBundle\Controller\HomeController as HomeController;


class ImageTransController extends HomeController
{
    protected $em ;

    function __construct(EntityManager $entityManager)
    {
    ...

but I'm getting this error:

Catchable Fatal Error: Catchable Fatal Error: Argument 1 passed to MSD\HomeBundle\Controller\ImageTransController::__construct() must be an instance of Doctrine\ORM\EntityManager, none given, called in /home/manolo/MiServer/itransformer/app/cache/dev/jms_diextra/controller_injectors/MSDHomeBundleControllerImageTransController.php on line 13 and defined in /home/manolo/MiServer/itransformer/src/MSD/HomeBundle/Controller/ImageTransController.php line 38 (500 Internal Server Error)

New attempt:

I've also tried with @praxmatig answer:

//services.yml
parameters:
 msd.controller.imagetrans.class: MSD\HomeBundle\Controller\ImageTransController

services:
  msd.imagetrans.controller:
    class:  "%msd.controller.imagetrans.class%"
    arguments: [ @doctrine.orm.entity_manager  ]

//ImageTransController.php
namespace MSD\HomeBundle\Controller;

 use Doctrine\ORM\EntityManager;

class ImageTransController 
 {
    protected $em ;

    function __construct(EntityManager $em)
    {
        $this->em = $em;
    }
     ...

//routing.yml
msd_home_cambiardimensiones:
    pattern: /cambiardimensiones
    defaults: { _controller: MSDHomeBundle:msd.imagetrans.controller:cambiardimensionesAction }

but I get this error:

 Unable to find controller &quot;MSDHomeBundle:msd.imagetrans.controller&quot; - class &quot;MSD\HomeBundle\Controller\msd.imagetrans.controllerController&quot; does not exist. (500 Internal Server Error)

回答1:

You need to make a service for your class and pass the doctrine entity manager as the argument doctrine.orm.entity_manager.Like in services.yml

services:
  test.cutom.service:
    class:  Test\YourBundleName\Yourfoldernameinbundle\Test
    #arguments:
    arguments: [ @doctrine.orm.entity_manager  ] 
        #entityManager: "@doctrine.orm.entity_manager"

You must import your services.yml in config.yml

imports:
    - { resource: "@TestYourBundleName/Resources/config/services.yml" }

Then in your class's constructor get entity manager as argument

use Doctrine\ORM\EntityManager;
Class Test {

  protected $em;

  public function __construct(EntityManager $entityManager)
  {
    $this->em = $entityManager;
  }
}

Hope this makes sense

回答2:

Don't extend the base controller class when you register controller as a service. There is a documentation about it here

class ImageTestController
{
     private $em;

     public function __construct(EntityManager $em)
     {
         $this->em = $em;
     }

     public function someAction()
     {
         // do something with $this->em
     }
}

// services.yml
services:
    acme.controller.image_test:
        class: Acme\SomeBundle\Controller\ImageTestController

// routing.yml
acme:
    path: /
    defaults: { _controller: acme.controller.image_test:someAction }

回答3:

Why do you want to grab the Doctrine 2 EntityManager in the constructor of a controller?

Why not simply do $em = $this->getDoctrine()->getManager(); (or $em = $this->getDoctrine()->getEntityManager(); in Symfony 2.0) in the action(s) you need it? This saves you from the overhead of initializing the EntityManager when you don't need it.

If you really do want to do this, there are clear instructions on How to define Controllers as Services. Basically it looks like this:

# src/MSD/HomeBundle/Controller/ImageTransController.php

namespace MSD\HomeBundle\Controller;

use Doctrine\ORM\EntityManager;

class ImageTransController
{
    private $em;

    public function __construct(EntityManager $em)
    {
        $this->em = $em;
    }

    public function indexAction()
    {
        // use $this->em
    }
}


# src/MSD/HomeBundle/Resources/config/services.yml

parameters:
    msd.controller.image_trans.class: MSD\HomeBundle\Controller\ImageTransController

services:
    msd.controller.image_trans:
        class:     "%msd.controller.image_trans.class%"
        arguments: ["@doctrine.orm.default_entity_manager"]

# app/config/routing.yml

msd_home_cambiardimensiones:
    path:         /cambiardimensiones
    defaults:     { _controller: msd.controller.image_trans:indexAction }

回答4:

You have to add

use Doctrine\ORM\EntityManager;

in your controller

回答5:

I see that you are trying to get the entity manager in the constructor of the controller, which is not the way to do so , unless you plan to define your controller as a service. which on this case, you need to use dependency injection to inject the service entity manager.

But in general the common way to use entity manager in a controller is simply by getting it using the following code:

  $entityManager = $this->container->get('doctrine.orm.entity_manager');

回答6:

I think you are in the right direction, I would take the second option:

For the second option I think that the definition inside routing.yml is wrong

//routing.yml 
msd_home_cambiardimensiones:
    pattern: /cambiardimensiones
    defaults: { _controller: msd.imagetrans.controller:cambiardimensionesAction }

Here just remove MSDHomeBundle from the _controller inside defaults

For the first option:

Does HomeController has its own constructor?

//src/MSD/HomeBundle/Resources/config/services.yml
services:
    imageTransController.custom.service:
        class:  MSD\HomeBundle\Controller\ImageTransController
        arguments: [@doctrine]

it could help then inside the constructor

__construct(Registry $doctrine)
$this->doctrine = $doctrine;

or

$this->em = $doctrine->getManager();

来源：https://stackoverflow.com/questions/20587354/how-to-call-entity-manager-in-a-constructor

标签

php

symfony

constructor

entitymanager