Symfony 3 - EntityManager dependency injection with multiple db connections - symfony

Question

I have setup a Custom Authenticator using guard and auto wired the service. This is tested and works fine with just MySQL configured.
I have now specified a second database connection (oracle), but Symfony will now not allow autowiring in my service configuration, because it does not know which database connection to use when injecting EntityManager in to the custom Authenticator class.
Any idea how I can Configure the Dependency Injection to use a specific database connection so I can continue to use AutoWire.
Unable to autowire argument of type "Doctrine\ORM\EntityManager" for the service "user.security.login_form_authenticator". Multiple services exist for this class (doctrine.orm.prism_entity_manager, doctrine.orm.baan_entity_manager).
Here is my Doctrine config in config.yml
doctrine:
dbal:
connections:
prism:
driver: pdo_mysql
host: "%database_host%"
port: "%database_port%"
dbname: "%database_name%"
user: "%database_user%"
password: "%database_password%"
charset: UTF8
# if using pdo_sqlite as your database driver:
# 1. add the path in parameters.yml
# e.g. database_path: "%kernel.root_dir%/../var/data/data.sqlite"
# 2. Uncomment database_path in parameters.yml.dist
# 3. Uncomment next line:
#path: "%database_path%"
baan:
driver: oci8
host: "%baan_host%"
port: "%baan_port%"
dbname: "%baan_db_name%"
user: "%baan_user%"
password: "%baan_password%"
charset: AL32UTF8
orm:
default_entity_manager: prism
auto_generate_proxy_classes: "%kernel.debug%"
entity_managers:
auto_mapping: true
prism:
naming_strategy: doctrine.orm.naming_strategy.underscore
connection: prism
mappings:
UserBundle:
type: annotation
baan:
connection: baan
mappings:
BaanBundle:
type: annotation
Here is the constructor in my Authenticator class
private $formFactory;
private $em;
private $router;
public function __construct(FormFactoryInterface $formFactory, EntityManager $em, RouterInterface $router)
{
$this->formFactory = $formFactory;
$this->em = $em;
$this->router = $router;
}

Answer 1

You can extend Doctrine's EntityManagerDecorator, which implements EntityManagerInterface and accepts an instance of EntityManager in its constructor.
First extend the EntityManagerDecorator class once for each of your connections.
namespace MyBundle\Service\Database;
use Doctrine\ORM\Decorator\EntityManagerDecorator;
class PrismEntityManager extends EntityManagerDecorator {}
class BaanEntityManager extends EntityManagerDecorator {}
Then in your service configuration, you need to manually wire these two services.
MyBundle\Service\Database\PrismEntityManager:
arguments:
$wrapped: '#doctrine.orm.prism_entity_manager'
MyBundle\Service\Database\BaanEntityManager:
arguments:
$wrapped: '#doctrine.orm.baan_entity_manager'
Now you just have to type-hint for one of these services.
public function __construct(FormFactoryInterface $formFactory, PrismEntityManager $em, RouterInterface $router)
{
$this->formFactory = $formFactory;
$this->em = $em;
$this->router = $router;
}

Answer 2

I don't know if i understood your question correctly or not but you can set different configurations for different database connection as below:
dbal:
default_connection: default
connections:
default:
driver: pdo_mysql
host: "%database_host%"
port: "%database_port%"
dbname: "%database_name%"
user: "%database_user%"
password: "%database_password%"
charset: UTF8
mapping_types:
enum: smallint
custom:
driver: pdo_mysql
host: '%database_host2%'
port: '%database_port2%'
dbname: '%database_name2%'
user: '%database_user2%'
password: '%database_password2%'
charset: UTF8
mapping_types:
enum: smallint
orm:
default_entity_manager: default
auto_generate_proxy_classes: "%kernel.debug%"
entity_managers:
auto_mapping: true
default:
naming_strategy: doctrine.orm.naming_strategy.underscore
connection: default
mappings:
EntityBundle:
type: annotation
alias: DBAlias
custom:
naming_strategy: doctrine.orm.naming_strategy.underscore
connection: custom
mappings:
EntityBundle:
type: annotation
alias: DBAlias
Now you can passed your custom EntityManager using doctrine.orm.custom_entity_manager.

Answer 3

I think, I had the same issue with DBAL Connections as you have with EntityManager. I have solved this issue with some proxy class - described in this answer:
https://stackoverflow.com/a/46265170/6357312
Any question let me know.