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In Symfony2 you can work with multiple entity managers and use something like the code below:

$em = $this->get('doctrine')->getManager();
$em = $this->get('doctrine')->getManager('default');

$customerEm =  $this->get('doctrine')->getManager('customer');

We can inject the default manager to any service by using:

"@doctrine.orm.entity_manager"

How can you inject non-default entity managers into services?