将结果集映射到实体的元组

Question

我需要获取Item的列表，并且在可用时，如果当前CustomerItem拥有Customer，则将其关联。

在实体方面，我有3类：

客户

class Customer {
    private $id;
    private $name;
}

项目

class Item {
    private $id;
    private $description;
}

CustomerItem

class Item {
    private $item;     // One way ManyToOne
    private $customer; // One way ManyToOne
    private $amount;
}

ItemRepository内部的查询生成器如下所示：

$this->createQueryBuilder('item')
     ->leftJoin(
         ItemCustomer::class, 
         'ic', 
         Join::WITH,
         'ic.item = item AND ic.customer = :customer'
     )
     ->addSelect('ic');

假设有Item个 A ， B 和 C ，而我们的Customer拥有5个 A 和3x C ，我希望得到的结果如下：

[
  {
    "item": { id: "A" , name: "Aaa" },
    "customerItem": { item: { id: "A" , name: "Aaa" }, customer : {...}, amount: 5 }
  },
  {
    "item": { id: "B" , name: "Bbb" },
    "customerItem": null
  },
  {
    "item": { id: "C" , name: "Ccc" },
    "customerItem": { item: { id: "C" , name: "Ccc" }, customer : {...}, amount: 3 }
  }
]

但是实际上看起来像：

[
  { id: "A" , name: "Aaa" },
  { item: { id: "A" , name: "Aaa" }, customer : {...}, amount: 5 },
  { id: "B" , name: "Bbb" },
  null,
  { id: "C" , name: "Ccc" },
  { item: { id: "C" , name: "Ccc" }, customer : {...}, amount: 3 }
]

我也尝试使用本机查询和ResultSetMappingBuilder

$rsm = new ResultSetMappingBuilder($this->_em);
$rsm->addRootEntityFromClassMetadata(Item::class, 'item');
$rsm->addRootEntityFromClassMetadata(CustomerItem::class, 'ci');

$selectClause = $rsm->generateSelectClause();
$sql = <<<SQL
    SELECT $selectClause FROM item
    JOIN customer_item ci ON ci.itemId = item.id
    AND ci.customerId = :customerId
SQL;

$this->_em->createNativeQuery($sql, $rsm);

但是结果是一样的。

最后，我自己做了映射

$length = \count($results);
for ($i = 0; $i < $length; $i += 2) {
    $joinResult[] = [
        'item'         => $results[$i],
        'customerItem' => $results[$i + 1],
    ];
}

可以提供预期的结果，但这样做时感觉不对。