<?php

use Plusquam\Bundle\ContractBundle\Service\Invoice;

class ContractAdminController extends Controller
{
  /**
   * Invoice action
   *
   * @return Response
   */
  public function invoiceAction(Request $request)
  {
      // ...
//        $invoice = $this->get('contract.invoice');
        $invoice = new Invoice($contract, $em->getRepository('PlusquamContractBundle:Contract'));
  }
}