Overwriting entities from another bundle in Symfony2 - php

Question

We're writing a custom CMS based on Symfony2 and are currently working on the user system. Our bundle has defined a BaseSiteUser that contains all the most common properties that a site may need for it's user data, and a SiteUser that extends BaseSiteUser and defines a table for the entity.
The idea was that for each individual project we'd overwrite the SiteUser entity by creating a more specific one in the new project's namespace, or use the default one if we don't specify a new one.
Our bundle architecture looks somewhat like this:
OurCompany
CMSBundle
Entities
BaseSiteUser.php
SiteUser.php
CustomerName
CustomerProjectBundle
CMSBundle
Entities
SiteUser.php
Our problem is that we can't build the model so that the SiteUser defined in CustomerName\CMSBundle is used instead of the one in OurCompany\CMSBundle. Instead, we get this error:
[Doctrine\DBAL\Schema\SchemaException]
The table with name 'siteuser' already exists.
We tried consulting the documentation, but that part has not been covered yet. Searching the web did not provide a solution, either.
We are using the annotation method for defining the model.

Answer 1

I have deleted my previous answer as it as wrong :). Just checked implementation of FOSUserBundle. They are using inheritance mapping. So in your core CMSBundle define BaseSiteUser as #MappedSuperclass and in your overridden bundle just extend BaseSiteUser.

Answer 2

I think this solution should work (pseudocode):
OurCompany
CMSBundle
Entities
/**
* BaseSiteUser
*
* #ORM\Entity(repositoryClass="OurCompany\CMSBundle\Repository\SiteUserRepository")
* #ORM\Table(name="siteuser")
* #ORM\InheritanceType("SINGLE_TABLE")
* #ORM\DiscriminatorColumn(name="discr", type="string")
*
* DON'T USE EXPLICIT DISCRIMINATOR MAP (it will be generated automatically) !!!
* # ORM\DiscriminatorMap({"basesiteuser" = "BaseSiteUser", "siteuser" = "SiteUser"})
*/
BaseSiteUser.php
/**
* SiteUser
*
* #ORM\Table(name="siteuser")
*/
SiteUser.php => class SiteUser extends CustomerName\CMSBundle\Entities\SiteUserCustom
CustomerName
CustomerProjectBundle
CMSBundle
Entities
/**
* SiteUserCustom
*
* #ORM\Table(name="siteuser")
*/
SiteUserCustom.php => class SiteUserCustom extends OurCompany\CMSBundle\Entities\BaseSiteUser
Don't forget to register your bundles in AppKernel.php.
If you want to be able to define new fields in SiteUserCustom add your CustomerNameCMSbundle to the entity-manager configuration:
orm:
entity_managers:
default:
mappings:
OurCompanyCMSbundle: ~
CustomerNameCMSbundle: ~