与同一Symfony包中的不同实体的多个连接

Question

我正在与Symfony开发一个新项目，该项目将在同一个包中拥有一个网站和一个管理站点。我有2个不同的连接（一个用于数据数据库，一个用于管理数据库），我希望能够区分实体，因此我有config.yml：

doctrine:
  dbal:
      default_connection: project
      connections:
          project:
              driver:   pdo_pgsql
              host:     '%database_host%'
              port:     '%database_port%'
              dbname:   '%database_name%'
              user:     '%database_user%'
              password: '%database_password%'
              charset:  UTF8
          backoffice:
              driver:   pdo_pgsql
              host:     '%backoffice_database_host%'
              port:     '%backoffice_database_port%'
              dbname:   '%backoffice_database_name%'
              user:     '%backoffice_database_user%'
              password: '%backoffice_database_password%'
              charset:  UTF8

  orm:
      default_entity_manager: project
      entity_managers:
          project:
              naming_strategy: doctrine.orm.naming_strategy.underscore
              connection: project
              auto_mapping: true
              mappings:
                    # you must specify the type
                    type:     "annotation"    
                    # The directory for entity (relative to bundle path)
                    dir:      "Entity/project"
                    #the prefix 
                    prefix:   "Project\\ProjectBundle\\Entity\\Project"
          backoffice:
              naming_strategy: doctrine.orm.naming_strategy.underscore
              connection: backoffice
              mappings:
                    # you must specify the type
                    type:     "annotation"    
                    # The directory for entity (relative to bundle path)
                    dir:      "Entity/Backoffice/"
                    #the prefix 
                    prefix:   "Project\\ProjectBundle\\Entity\\Backoffice"

现在我正在尝试配置FOSUserBundle，当我想更新后台数据库的架构时，我收到以下错误：The class 'Project\ProjectBundle\Entity\Backoffice\User' was not found in the chain configured namespaces Project\ProjectBundle\Entity\Project, FOS\U serBundle\Model。 FOSUserBundle配置为：

fos_user:
    db_driver: orm # other valid values are 'mongodb', 'couchdb' and 'propel'
    firewall_name: backoffice
    user_class: Project\ProjectBundle\Entity\Backoffice\User
    from_email:
        address: "%mailer_user%"
        sender_name: "%mailer_user%"

有没有办法实现这一目标？我想到的另一个解决方案是使用仅包含项目数据库实体的Bundle，但我不知道这是否太复杂。

由于