Symfony2: How to import existing database into different bundles - import

Question

I've seen a lot of posts here which describes the separation of concerns regarding organizing your app in bundles which work on their containing entities. But none of them states the point that these entities are related through different bundles.
As I already have an existing database which contains tables for posts, comments, tags, users, roles and some more I want to import this definition into my new symfony2 project.
My problem is that I would like to have that in different bundles like BlogBundle, UserBundle, StaticBundle, ..., but I do not know how to import the respective entities into the right bundle.
Further problem is that the user entity is referenced inside the post and comment entity so how should I do that. When I import the post, comment, tag into the BlogBundle, the user entity does not exist yet.
Can anyone guide me with a hint on how to go on with that process?

Answer 1

Entities are shared between bundles (of course).
If you want to do a blog, you can create a UserBundle (which could override the awesome FOSUserBundle for example), and a BlogBundle.
UserBundle will contain your User entity, BlogBundle will contain your Post and Comment entities.
Now an example of code:
In your UserBundle:
<?php
namespace YourVendorName\UserBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Table(name="my_user_table")
* #ORM\Entity(repositoryClass="YourVendorName\UserBundle\Entity\UserRepository")
*/
class User
{
/**
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(name="name")
*/
private $name;
// Getters and setters...
}
In your BlogBundle:
<?php
namespace YourVendorName\BlogBundle\Entity;
class Post
{
/**
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(name="title", type="string", length=255)
*/
private $title;
/**
* #ORM\Column(name="body", type="text")
*/
private $body;
/**
* #ORM\Column(name="created_at", type="datetime")
*/
private $createdAt;
/**
* #ORM\ManyToOne(targetEntity="YourVendorName\UserBundle\Entity\User")
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
*/
private $author;
// Getters and setters
}
So you reference an entity in another bundle thanks to such annotations:
#ORM\ManyToOne(targetEntity="YourVendorName\UserBundle\Entity\User")
Anyway, you should really read the Symfony2 documentation, it might help you understand everything.