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March 21, 2016 15:20
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KnpUniversity Symfony REST: Using @link with the PaginatedCollection (http://knpuniversity.com/screencast/symfony-rest3/evaluating-expression)
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| <?php | |
| namespace AppBundle\Annotation; | |
| /** | |
| * @Annotation | |
| * @Target("CLASS") | |
| */ | |
| class Link | |
| { | |
| /** | |
| * @Required | |
| * | |
| * @var string | |
| */ | |
| public $name; | |
| /** | |
| * @var string | |
| */ | |
| public $route; | |
| public $params = array(); | |
| /** | |
| * Instead of specifying route+params, you can just | |
| * specify the link directly | |
| * | |
| * @var string | |
| */ | |
| public $url; | |
| } |
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| <?php | |
| namespace AppBundle\Serializer; | |
| use AppBundle\Annotation\Link; | |
| use Doctrine\Common\Annotations\Reader; | |
| use JMS\Serializer\EventDispatcher\EventSubscriberInterface; | |
| use JMS\Serializer\EventDispatcher\ObjectEvent; | |
| use JMS\Serializer\JsonSerializationVisitor; | |
| use Symfony\Component\ExpressionLanguage\ExpressionLanguage; | |
| use Symfony\Component\Routing\RouterInterface; | |
| class LinkSerializationSubscriber implements EventSubscriberInterface | |
| { | |
| private $router; | |
| private $annotationReader; | |
| private $expressionLanguage; | |
| public function __construct(RouterInterface $router, Reader $annotationReader) | |
| { | |
| $this->router = $router; | |
| $this->annotationReader = $annotationReader; | |
| $this->expressionLanguage = new ExpressionLanguage(); | |
| } | |
| public function onPostSerialize(ObjectEvent $event) | |
| { | |
| /** @var JsonSerializationVisitor $visitor */ | |
| $visitor = $event->getVisitor(); | |
| $object = $event->getObject(); | |
| $annotations = $this->annotationReader | |
| ->getClassAnnotations(new \ReflectionObject($object)); | |
| $links = array(); | |
| foreach ($annotations as $annotation) { | |
| if ($annotation instanceof Link) { | |
| if ($annotation->url) { | |
| $uri = $this->evaluate($annotation->url, $object); | |
| } else { | |
| $uri = $this->router->generate( | |
| $annotation->route, | |
| $this->resolveParams($annotation->params, $object) | |
| ); | |
| } | |
| // allow a blank URI to be an optional link | |
| if ($uri) { | |
| $links[$annotation->name] = $uri; | |
| } | |
| } | |
| } | |
| if ($links) { | |
| $visitor->addData('_links', $links); | |
| } | |
| } | |
| private function resolveParams(array $params, $object) | |
| { | |
| foreach ($params as $key => $param) { | |
| $params[$key] = $this->evaluate($param, $object); | |
| } | |
| return $params; | |
| } | |
| private function evaluate($expression, $object) | |
| { | |
| return $this->expressionLanguage | |
| ->evaluate($expression, array('object' => $object)); | |
| } | |
| public static function getSubscribedEvents() | |
| { | |
| return array( | |
| array( | |
| 'event' => 'serializer.post_serialize', | |
| 'method' => 'onPostSerialize', | |
| 'format' => 'json', | |
| ) | |
| ); | |
| } | |
| } |
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| <?php | |
| namespace AppBundle\Pagination; | |
| use AppBundle\Annotation\Link; | |
| /** | |
| * @Link( | |
| * "self", | |
| * url = "object.getUrl('self')" | |
| * ) | |
| * @Link( | |
| * "next", | |
| * url = "object.getUrl('next')" | |
| * ) | |
| * @Link( | |
| * "prev", | |
| * url = "object.getUrl('prev')" | |
| * ) | |
| * @Link( | |
| * "first", | |
| * url = "object.getUrl('first')" | |
| * ) | |
| * @Link( | |
| * "last", | |
| * url = "object.getUrl('last')" | |
| * ) | |
| */ | |
| class PaginatedCollection | |
| { | |
| private $items; | |
| private $total; | |
| private $count; | |
| private $links = array(); | |
| public function __construct(array $items, $totalItems) | |
| { | |
| $this->items = $items; | |
| $this->total = $totalItems; | |
| $this->count = count($items); | |
| } | |
| public function addLink($ref, $url) | |
| { | |
| $this->links[$ref] = $url; | |
| } | |
| public function getUrl($ref) | |
| { | |
| return isset($this->links[$ref]) ? $this->links[$ref] : ''; | |
| } | |
| } |
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Hi, @weaverryan, i needed to add
@Serializer\Exclude()in order no prevent duplication of_linkaslink.This was my result without the Annotation:
Annotation I added:
Additionally, I removed the
ifverification on line 56 ofLinkSerializationSubscriber.phpas it's no longer needed.https://gist.github.com/brunodplima/2f984535556c959327a6730f3e89e93c/revisions