How to inject non-default entity managers?

Question

In Symfony2 you can work with multiple entity managers and use something like the code below:

$em = $this->get(\'doctrine\')->getManager();
$em = $this         


        

Answer 1

Hello first of all create your manager, in my example I create the manager for my Item class that is in a CoreBundle:

em = $em;
        $this->repository = $em->getRepository($entityName);
        $this->entityName = $entityName;
    }

    /**
     * Save a entity object
     *
     * @param Object $entity
     * 
     * @return Object Entity
     */
    public function save($entity)
    {
        $this->persistAndFlush($entity);

        return $entity;
    }

    /**
     * Remove a entity object
     *
     * @param Object $entity
     * 
     * @return Object Entity
     */
    public function remove($entity)
    {
        return $this->removeAndFlush($entity);
    }

    /**
     * Persist object
     *
     * @param mixed $entity
     * 
     * @return void
     */
    protected function persistAndFlush($entity)
    {
        $this->em->persist($entity);
        $this->em->flush();
    }

    /**
     * Remove object
     *
     * @param mixed $entity entity to remove
     * 
     * @return void
     */
    protected function removeAndFlush($entity)
    {
        $this->em->remove($entity);
        $this->em->flush();
    }

    /**
     * Returns entity repository object
     * 
     * @return EntityRepository
     */
    public function getRepository()
    {
        return $this->repository;
    }

    /**
     * Create a new object
     * 
     * @return mixed
     */
    public function createNewObject()
    {
        return new Item();
    }

    // Create your own methods to manage the object

}

If the manager structure is shared between multiple manager, you can create a BaseManager extended by all other managers !

Then register it in the services.yml (or xml) file of your bundle:

# src/Sybio/Bundle/CoreBundle/Resources/config/services.yml or xml !:

parameters:

    # Managers _________________

    sybio.item_manager.entity: SybioCoreBundle:Item
    sybio.item_manager.class: Sybio\Bundle\CoreBundle\Manager\ItemManager

services:

    # Managers _________________

    sybio.item_manager:
        class:        %sybio.item_manager.class%
        arguments:    [@doctrine.orm.entity_manager, %sybio.item_manager.entity%]

That's it, you can now use it:

// Controller:

$im =  $this->get('sybio.item_manager');

$item = $im->createNewObject();
$im->save($item);

You can then improve your manager, here I give an array of config parameters to my manager:

# src/Sybio/Bundle/CoreBundle/Resources/config/services.yml or xml !:

sybio.item_manager:
        class:        %sybio.item_manager.class%
        arguments:    [@doctrine.orm.entity_manager, %sybio.item_manager.entity%, {'item_removed_state': %item_removed_state%, 'item_unpublished_state': %item_unpublished_state%, 'item_published_state': %item_published_state%}]


// src/Sybio/Bundle/CoreBundle/Manager/ItemManager.php:

public function __construct(EntityManager $em, $entityName, $params = array()) {
    // ...
    $this->params = $params;
}

If you create a BaseManager, you can also create a usefull generic method to initialize an object:

// src/Sybio/Bundle/CoreBundle/Manager/BaseManager.php:

/**
 * Create a new object
 * 
 * @return mixed
 */
public function createNewObject()
{
    $entityName = explode(":", $this->entityName);
    $entityName = "Sybio\Bundle\CoreBundle\Entity\\".$entityName[1];

    return new $entityName;
}