从实体对象symfony 2调用doctrine

Question

I'm investigating symfony 2 framework. In my sample app I have Blog entity and BlogEntry entity. They are connected with one to many relationship. This is BlogEntry class:

class BlogEntry
{
    ....
    private $blog;
    ....
    public function getBlog()
    {
        return $this->blog;
    }

    public function setBlog(Blog $blog)
    {
        $this->blog = $blog;
    }
}

I want to add method setBlogByBlogId to BlogEntry class, I see it this way:

public function setBlogByBlogId($blogId)
    {
        if ($blogId && $blog = $this->getDoctrine()->getEntityManager()->getRepository('AppBlogBundle:Blog')->find($blogId))
        {
            $this->setBlog($blog);
        }
        else
        {
            throw \Exception();
        }
    }

Is this any way to get doctrine in model class? Is this correct from the point of Symfony 2 MVC architecture? Or I should do this in my controller?

Answer 1

You should use your blogId to query your repository for the blog object before trying to set it on your BlogEntry entity.

Once you have the blog object, you can simply call setBlog($blog) on your BlogEntry entity.

You can either do this in your controller, or you can create a Blog Service (a Blog Manager) to do it for you. I would recommend doing it in a service:

Define your service in Your/Bundle/Resources/config/services.yml:

services
    service.blog:
    class: Your\Bundle\Service\BlogService
    arguments: [@doctrine.orm.default_entity_manager]

Your/Bundle/Service/BlogService.php:

class BlogService
{

    private $entityManager;

    /*
     * @param EntityManager $entityManager
     */
    public function __construct($entityManager)
    {
        $this->entityManager = $entityManager;
    }

    /*
     * @param integer $blogId
     *
     * @return Blog
     */
    public function getBlogById($blogId)

        return $this->entityManager
                    ->getRepository('AppBlogBundle:Blog')
                    ->find($blogId);
    }
}

And then in your controller you can simply go:

$blogId = //however you get your blogId
$blogEntry = //however you get your blogEntry

$blogService = $this->get('service.blog');
$blog = $blogService->getBlogById($blogId);

$blogEntry->setBlog($blog);