zend-blog-3-backend

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<?php
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namespace App\ArgumentResolver;
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use App\Entity\Post;
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use App\Repository\PostRepository;
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpKernel\Controller\ArgumentValueResolverInterface;
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use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadata;
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class PostValueResolver implements ArgumentValueResolverInterface
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{
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    /**
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     * @var PostRepository
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     */
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    private $repository;
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    public function __construct(PostRepository $repository)
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    {
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        $this->repository = $repository;
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    }
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    /**
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     * @param Request $request
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     * @param ArgumentMetadata $argument
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     *
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     * @return bool
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     */
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    public function supports(Request $request, ArgumentMetadata $argument)
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    {
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        if (Post::class !== $argument->getType()) {
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            return false;
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        }
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        return $request->attributes->has('slug');
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    }
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    /**
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     * @param Request $request
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     * @param ArgumentMetadata $argument
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     *
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     * @return \Generator
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     */
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    public function resolve(Request $request, ArgumentMetadata $argument)
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    {
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        yield $this->repository->findOneBy(['url' => $request->attributes->get('slug')]);
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    }
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}
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