Where to create method to use in templates in Symfony 2 - symfony

Question

In my template, I want to call a function that will display the total counts of of Employee in Company.Employee is related to Department, Department related to Company in one to many relationships.
{% for com in company %}
{{ com.name }}
{{ com.description }}
{{ com.getNumberOfEmp|length }} //this a function must display counts of employee
{% endfor %}
In controller
$em = $this->getDoctrine()->getManager();
$company = $em->getRepository('Bundle:Company')->findAll();
Where should I put the getNumberOfEmp method?
In Symfony 1.4, I easily achieved this by putting the getNumberOfEmp in the company.class that will call the company.table.class
Another question is, how to properly use Doctrine or DQL to query multiple Join?
I tried this function but I don't know if it is the proper way
companyrepository.php
public function getNumberOfEmp()
{
return $this
->createQueryBuilder()
->select('e.firstname')
->from('Emp e')
->leftJoin('e.Department d')
->leftJoin('d.Company c')
->where('i.id =:$id)
->setParameter('id',$this->id)// I am confused about this since i want to display all names of the company
->getQuery()
->getResult()
;
}
In Symfony 1.4 I use it this way
//company.class.php
public function getNumberOfEmp()
{
$emp = Doctrine_Core::getTable('Company')->createQuery('c')
->select('v.firstname')
->from('Employeers e')
->leftJoin('e.Department d')
->leftJoin('d.Company c')
->where('c.id=?',$this->id);
return $emp->execute();
}
And easily call it in php template
<?php foreach ($company as $com): ?>
<?php echo $com->name ?>/display name of company
<?php echo $com->description ?>//description
<?php echo count($com.getNumberOfEmp) ?>//dispalys number of employees
<?php endforeach ?>
Any Ideas?

Answer 1

Just a create a twig extension, and use with it with an argument; something like:
The extension class:
<?php
namespace WHERE\YOU_WANT\TO\CREATE_IT;
class TestExtension extends \Twig_Extension
{
protected $em;
public function __construct($em)
{
$this->em = $em;
}
public function getFunctions()
{
return array(
//this is the name of the function you will use in twig
new \Twig_SimpleFunction('number_employees', array($this, 'a'))
);
}
public function getName()
{
return 'nbr_employees';
}
public function a($id)
{
$qb=$this->em->createQueryBuilder();
$qb->select('count(n.id)')
->from('XYZYOurBundle:Employee','n')
->where('n.company = :x)
->setParameter('x',$id);
$count = $qb->getQuery()->getSingleScalarResult();
return $count;
}
}
Define your extension in service.yml and inject the entity manager:
numberemployees:
class: THE\EXTENSION\NAMESPACE\TestExtension
tags:
- { name: twig.extension }
arguments:
em: "#doctrine.orm.entity_manager"
and finally you can use it in your template like :
{% for com in company %}
{{ com.name }}
{{ com.description }}
{{ number_employees(com.id) }}
{% endfor %}