doctrine将oneToMany的计数结果添加到所选对象

Question

我有两个表，客户和订单（oneToMany）。我需要选择所有客户（作为对象）并添加到客户对象orderTotal字段。我创建了这样的查询：

return $this->createQueryBuilder('c')
->select('c as customer', 'COUNT(o.id) as totalOrders')
->join('c.orders', 'o')
->groupBy('c.id')
->getQuery()->getResult();

但是学说让我回答：

array:2 [▼
  0 => array:2 [▼
    "customer" => Customer {#748 ▶}
    "totalOrders" => "49"
  ]
  1 => array:2 [▼
    "customer" => Customer {#777 ▶}
    "totalOrders" => "50"
  ]
]

如何更改此查询并将“totalOrders”移动到Customer对象？