Right way to inject container service in Sonata Admin Bundle

问题

I'm trying to inject the service container in my Sonata Admin class in order to use it at configureFormFields method. This is what I have:

config.yml (sonata services definition)

services:
  tan.product.admin.product:
    class: Tan\ProductBundle\Admin\ProductAdmin
    tags:
      - { name: sonata.admin, manager_type: orm, group: Product, label: Product }
    arguments: [ null, Tan\ProductBundle\Entity\Product, @service_container]

ProductAdmin.php

class ProductAdmin extends Admin
{

    /** @var \Symfony\Component\DependencyInjection\ContainerInterface */
    private $container;
    public $supportsPreviewMode = true;

    /**
     * @param string $code
     * @param string $class
     * @param string $baseControllerName
     */
    public function __construct($code, $class, $baseControllerName, $container = null)
    {
        parent::__construct($code, $class, $baseControllerName);
        $this->container = $container;
    }

    // other methods 

    protected function configureFormFields(FormMapper $form)
    {

        $helper = $this->container->get('oneup_uploader.templating.uploader_helper');
        $endpoint = $helper->endpoint('products');

        $form
                ->add('product_name', null, array('label' => 'Nombre'))
                ->add('product_description', null, array('label' => 'Descripción'));
    }

}

But I'm getting this error:

ContextErrorException: Catchable Fatal Error: Object of class appDevDebugProjectContainer could not be converted to string in /var/www/html/tan/var/cache/dev/classes.php line 12979

What's wrong there?

回答1:

Since your constructor takes 4 arguments where the 4th is the service container, you need to pass in the service container 4th:

services:
  tan.product.admin.product:
  class: Tan\ProductBundle\Admin\ProductAdmin
  tags:
      - { name: sonata.admin, manager_type: orm, group: Product, label: Product }
  arguments: [ null, Tan\ProductBundle\Entity\Product, null, @service_container]

回答2:

If you only want to access container in admin class you can simply call

$this->getConfigurationPool()->getContainer() 

which will simple return the container for a formal way create a base admin class for your bundle which will extend admin class of sonata and then you can define your function in base admin class to return a container and use it in your child admin classes, product base admin class will look like

use Sonata\AdminBundle\Admin\Admin;

class ProductBaseAdmin extends Admin
{
    public function __construct($code, $class, $baseControllerName)
    {
            parent::__construct($code, $class, $baseControllerName);
    }
    public function getContainer(){
        return $this->getConfigurationPool()->getContainer();
    }
}

And now in your child class you can acess container through $this->getContainer() which will call getContainer() function of your ProductBaseAdmin class

use Tan\ProductBundle\Admin\ProductBaseAdmin
class ProductAdmin extends ProductBaseAdmin
{
    protected function configureFormFields(FormMapper $form)
    {

        $helper = $this->getContainer()->get('oneup_uploader.templating.uploader_helper');
        $endpoint = $helper->endpoint('products');

        $form
                ->add('product_name', null, array('label' => 'Nombre'))
                ->add('product_description', null, array('label' => 'Descripción'));
    }
}

回答3:

Trying to add 4th argument to Admin constructor lead me to error:

"Argument 4 passed to AppBundle\Admin\WebLabAbstractMessageAdmin::__construct() must be an instance of Doctrine\ORM\EntityManager, none given" no matter what service I tried to pass to arguments.

So I used calls approach:

#services.yml
app.admin.twitter_message:
    class: AppBundle\Admin\WebLabAbstractMessageAdmin
    arguments: [~, AppBundle\Entity\Twitter\Message, SonataAdminBundle:CRUD]
    tags:
        - { name: sonata.admin, manager_type: orm, group: operator, label: Message, show_in_dashboard: false }
    calls:
        - ["setEntityManager", ['@doctrine.orm.entity_manager']]
        - ["setParentRepository", ['@app.doctrine.repository.twitter.conversation']]

with setters in the admin class

#MessageAdmin.php
/**
 * @var EntityManager
 */
private $entityManager;

private $parentRepository;

/**
 * @param EntityManager $entityManager
 * @return self
 */
public function setEntityManager(EntityManager $entityManager): self
{
    $this->entityManager = $entityManager;
    return $this;
}

/**
 * @param $parentRepository
 * @return self
 */
public function setParentRepository($parentRepository): self
{
    $this->parentRepository = $parentRepository;
    return $this;
}

My versions are: "symfony/symfony": "3.2.*", "sonata-project/admin-bundle": "^3.10".

Hope it helps someone.

来源：https://stackoverflow.com/questions/25149446/right-way-to-inject-container-service-in-sonata-admin-bundle