{"data":{"post":{"fields":{"slug":"/doctrine-new-dql-operator-and-objects/","date":"2018-04-03"},"html":"

Issue

\n

Sometimes we need to pull data from the database that doesn’t translate to an entity.\nFor example, we want to obtain an entity and SUM() of one of its fields in one query.\nOr three different SUM()s for statistics. To do that, the most objective-oriented solution\nis passing the data to a Data Transfer Object.

\n

Does NEW keyword help?

\n

The NEW keyword, available since Doctrine 2.4, unfortunately currently\nallows only scalar values passed to DTO’s constructor. Example:

\n
<?php\n\nnamespace Example\\DTO;\n\nclass SomeEntityData\n{\n    // Property definitions\n\n    public function __construct(string $field, ?int $count)\n    {\n        $this->field = $field;\n        $this->count = $count;\n    }\n\n    // Getters\n}
\n
<?php\n\nnamespace Example\\Repository;\n\nuse Doctrine\\ORM\\EntityRepository;\nuse Example\\DTO\\SomeEntityData;\n\nclass SomeEntityRepository extends EntityRepository\n{\n    public function getSomeEntityWithData() : array\n    {\n        $queryBuilder = $this->createQueryBuilder('someEntity');\n\n        $queryBuilder\n            ->select(\n                sprintf(\n                    'NEW %s(someEntity.field, COUNT(anotherEntity))',\n                    SomeEntityData::class\n                )\n            )\n            ->innerJoin('someEntity.collection', 'anotherEntity')\n            ->where('someEntity.value > 5')\n            ->groupBy('someEntity.id');\n\n        // EntityData[]\n        return $queryBuilder->getQuery()->getResult();\n    }\n}
\n

If we used NEW %s(entity, COUNT(anotherEntity)) and accepted Entity $entity\nin DTO constructor instead, we would get an error saying that entity is an unexpected string.

\n

You can easily miss that in\nthe official documentation\nbecause the line that speaks about scalar values is below two code blocks.

\n

What can we do then?

\n

There are multiple solutions. One of them, the simpliest in my opinion,\nis adding aliases to selected fields and mapping query results to DTOs:

\n
<?php\n\nnamespace Example\\Repository;\n\nuse Doctrine\\ORM\\EntityRepository;\nuse Example\\DTO\\SomeEntityData;\n\nclass SomeEntityRepository extends EntityRepository\n{\n    public function getSomeEntityWithData() : array\n    {\n        $queryBuilder = $this->createQueryBuilder('someEntity');\n\n        $queryBuilder\n            ->select('someEntity AS entityData, COUNT(anotherEntity) AS countData')\n            ->innerJoin('someEntity.collection', 'anotherEntity')\n            ->where('someEntity.value > 5')\n            ->groupBy('someEntity.id');\n\n        // EntityData[]\n        return \\array_map(\n            function (array $result) {\n                return new SomeEntityData($result['entityData'], $result['countData']);\n            },\n            $queryBuilder->getQuery()->getResult()\n        );\n    }\n}
\n

Another one is using Doctrine’s ResultSetMapping, which basically does\nthe same thing in a more defined and strict way.

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XSolve We are Agile Software House focused on PHP/Symfony, #JavaScript, #Java and #Mobile (iOS, Android, Windows Phone) #Inc5000 European company in 2018.\n
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