How to implement two tables intersection on Doctrine2 Symfony2 - symfony

Question

Im pretty new on all this stuff so please excuse my foolness.
I have two tables, clients and orders.
I need to show on a template all clients with their total orders amount for each.
According to MCV model, I just want the controller to call a method of the Clients repository that returns an array with all the data ready for sending it to the template.
But I having problems with implementing this.
So in summary I have:
Entities:
Clients.php: with client.id
Orders.php: with a manyToOne relatioonship to clients, and a amount property.
DefaultController.php
public function indexAction()
{
$em = $this->getDoctrine()->getManager();
$clientsWithTotals= $em->getRepository('ACMEAppBundle:Client')->getClientsWithTotals();
return $this->render('ACMEAppBundle:Default:index.html.twig',$clientsWithTotals);
}
ClientRepository.php:
class ClientRepositoryextends EntityRepository
{
public function getClientsWithTotals()
{
???
}
}
index.html.twig
{% extends '::base.html.twig' %}
{% block content %}
<table>
<thead>
<tr>
<th>Id</th>
<th>Total</th>
</tr>
</thead>
<tbody>
{% for entity in entities %}
<tr>
<td><{{ entity.id }}</td>
<td>{{ entity.total }}</td>
</tr>
{% endfor %}
</tbody>
</table>
{% endblock %}
Many thanks indeed

Answer 1

First off the template is using a variable which hasn't been defined (entities):
return $this->render(
'ACMEAppBundle:Default:index.html.twig',
array(
'entities' => $clientsWithTotals
)
);
Implementing the Repository:
class ClientRepository extends EntityRepository
{
public function getClientsWithTotals()
{
$this
->createQueryBuilder('client')
->join('client.orders', 'order');
}
}
As long as you have the oneToMany association correctly defined from Client to Orders and it's on the $client->orders property then the join will know that it has to filter out only the orders associated with a particular user.
Implementing the totals virtual property:
Your Client object will have no way of knowing what the totals are unless you do one of the following:
select the value from the DB using an aggregation function like SUM(orders.total) AS clientTotals.
select the orders associated with a client from the DB (Doctrine2 will hydrate them into $client->orders) and then using a foreach loop to sum up all the values.
As described here.
Ex. for #1:
You can construct a DQL query such as:
SELECT
client,
SUM(orders.total) as clientTotal
FROM ACMEAppBundle:Client AS client
JOIN client.orders AS orders;
The above query would normally return an array containing a all of the rows in the clients table in the following format:
array(
'client' => $client // an ACMEAppBundle:Client entity object
'clientTotals' => $clientTotals // an integer value representing the aggregate sum
);
Implementing a custom hydrator will allow you to decide what to do with the raw array data which is returned by the DB query.
Ex. for #2:
class Client
{
...
public function getTotals()
{
$this->totals = 0;
foreach ($this->getOrders as $order) {
$this->totals += $order->getTotal();
}
return $clientTotals;
}
...
}