WebResponse concept

A REST-ful API will expose collection and item entry-points for each resource. But in both case, you need to know your resource type or your resource identifier before executing your API call. Roadiz introduces a special resource named WebResponse which can be called using a path query param in order to reduce as much as possible API calls and address N+1 problem.

GET /api/web_response_by_path?path=/contact

API will expose a WebResponse single item containing:

• An item
• Item breadcrumbs
• Head object
• Item blocks tree-walker
• Item realms
• and if blocks are hidden by Realm configuration

Note

Roadiz WebResponse is used in Rezo Zero Nuxt Starter to populate all data during the asyncData() routine in _.vue page

{
    "@context": "/api/contexts/WebResponse",
    "@id": "/api/web_response_by_path?path=/contact",
    "@type": "WebResponse",
    "item": {
        "@id": "/api/pages/7",
        "@type": "Page",
        "content": "Magni deleniti ut eveniet. Aliquam aut et excepturi vitae placeat molestiae. Molestiae asperiores nihil sed temporibus quibusdam. Non magnam fuga at. sdf",
        "subTitle": null,
        "overTitle": null,
        "headerImage": [],
        "test": null,
        "pictures": [],
        "nodeReferences": [],
        "stickytest": false,
        "sticky": false,
        "customForm": [],
        "title": "Contact",
        "publishedAt": "2021-09-10T15:56:00+02:00",
        "metaTitle": "",
        "metaKeywords": "",
        "metaDescription": "",
        "users": [],
        "node": {
            "@type": "Node",
            "@id": "/api/nodes/7",
            "visible": true,
            "position": 3,
            "tags": []
        },
        "slug": "contact",
        "url": "/contact"
    },
    "breadcrumbs": {
        "@type": "Breadcrumbs",
        "@id": "_:14750",
        "items": []
    },
    "head": {
        "@type": "NodesSourcesHead",
        "@id": "_:14679",
        "googleAnalytics": null,
        "googleTagManager": null,
        "matomoUrl": null,
        "matomoSiteId": null,
        "siteName": "Roadiz dev website",
        "metaTitle": "Contact – Roadiz dev website",
        "metaDescription": "Contact, Roadiz dev website",
        "policyUrl": null,
        "mainColor": null,
        "facebookUrl": null,
        "instagramUrl": null,
        "twitterUrl": null,
        "youtubeUrl": null,
        "linkedinUrl": null,
        "homePageUrl": "/",
        "shareImage": null
    },
    "blocks": [],
    "realms": [],
    "hidingBlocks": false
}

Override WebResponse block walker

Imagine you have a block (ArticleFeedBlock) which should list latest news (Article). You can use tree-walker mechanism to fetch latest news and expose them as if they were children of your article feed block. This requires to create a custom definition:

<?php

declare(strict_types=1);

namespace App\TreeWalker\Definition;

use App\GeneratedEntity\NSArticle;
use App\GeneratedEntity\NSArticleFeedBlock;
use Doctrine\ORM\Tools\Pagination\Paginator;
use RZ\Roadiz\CoreBundle\Api\TreeWalker\NodeSourceWalkerContext;
use RZ\Roadiz\CoreBundle\Entity\NodesSources;
use RZ\TreeWalker\Definition\ContextualDefinitionTrait;
use RZ\TreeWalker\Definition\StoppableDefinition;
use RZ\TreeWalker\WalkerInterface;

final class ArticleFeedBlockDefinition implements StoppableDefinition
{
    use ContextualDefinitionTrait;

    public function isStoppingCollectionOnceInvoked(): bool
    {
        return true;
    }

    /**
     * @param NodesSources $source
     * @param WalkerInterface $walker
     * @return array
     * @throws \Exception
     */
    public function __invoke(NodesSources $source, WalkerInterface $walker): array
    {
        if ($this->context instanceof NodeSourceWalkerContext) {
            $this->context->getStopwatch()->start(self::class);
            if (!$source instanceof NSArticleFeedBlock) {
                throw new \InvalidArgumentException('Source must be instance of ' . NSArticleFeedBlock::class);
            }

            $criteria = [
                'node.visible' => true,
                'publishedAt' => ['<=', new \DateTime()],
                'translation' => $source->getTranslation(),
                'node.nodeType' => $this->context->getNodeTypesBag()->get('Article')
            ];

            // Prevent Article feed to list root Article again
            $root = $walker->getRoot()->getItem();
            if ($root instanceof NSArticle) {
                $criteria['id'] = ['!=', $root->getId()];
            }

            if (null !== $source->getNode() && \count($source->getNode()->getTags()) > 0) {
                $criteria['tags'] = $source->getNode()->getTags();
                $criteria['tagExclusive'] = true;
            }

            $count = (int) ($source->getListingCount() ?? 4);

            $children = $this->context->getNodeSourceApi()->getBy($criteria, [
                'publishedAt' => 'DESC'
            ], $count);


            if ($children instanceof Paginator) {
                $iterator = $children->getIterator();
                if ($iterator instanceof \ArrayIterator) {
                    $children = $iterator->getArrayCopy();
                } else {
                    throw new \RuntimeException('Unexpected iterator type');
                }
            }

            $this->context->getStopwatch()->stop(self::class);

            return $children;
        }
        throw new \InvalidArgumentException('Context should be instance of ' . NodeSourceWalkerContext::class);
    }
}

Then create a definition factory which will be injected using Symfony autoconfigure tag roadiz_core.tree_walker_definition_factory.

roadiz_core.tree_walker_definition_factory tag must include a classname attribute which will be used to match your definition factory with the right node source class.

<?php

declare(strict_types=1);

namespace App\TreeWalker\Definition;

use App\GeneratedEntity\NSArticleFeedBlock;
use RZ\Roadiz\CoreBundle\Api\TreeWalker\Definition\DefinitionFactoryInterface;
use RZ\TreeWalker\WalkerContextInterface;
use Symfony\Component\DependencyInjection\Attribute\AutoconfigureTag;

#[AutoconfigureTag(
    name:'roadiz_core.tree_walker_definition_factory',
    attributes: ['classname' => NSArticleFeedBlock::class]
)]
final class ArticleFeedBlockDefinitionFactory implements DefinitionFactoryInterface
{
    public function create(WalkerContextInterface $context, bool $onlyVisible = true): callable
    {
        return new ArticleFeedBlockDefinition($context);
    }
}

This way, all tree-walkers will be able to use your custom definition anytime a NSArticleFeedBlock is encountered.

You can debug all registered definition factories using bin/console debug:container --tag=roadiz_core.tree_walker_definition_factory command.

Retrieve common content

Now that we can fetch each page data, we need to get all unique content for building Menus, Homepage reference, headers, footers, etc. We could extend our _WebResponse_ to inject theses common data to each request, but it would bloat HTTP responses, and affect API performances.

For these common content, you can create a /api/common_content API endpoint in your project which will fetched only once in your frontend application.

# config/api_resources/common_content.yml
App\Api\Model\CommonContent:
    operations:
        getCommonContent:
            class: ApiPlatform\Metadata\Get
            method: 'GET'
            uriTemplate: '/common_content'
            read: false
            controller: App\Controller\GetCommonContentController
            pagination_enabled: false
            normalizationContext:
                enable_max_depth: true
                pagination_enabled: false
                groups:
                    - get
                    - common_content
                    - web_response
                    - walker
                    - walker_level
                    - children
                    - children_count
                    - nodes_sources_base
                    - nodes_sources_default
                    - urls
                    - blocks_urls
                    - tag_base
                    - translation_base
                    - document_display
                    - document_folders

Note

Keep in mind that /api/common_content endpoint uses nodes_sources_base normalization group which will only include essential node sources data. You can add more groups to include more data, such as nodes_sources_default or nodes_sources_cta if you grouped some fields into a CTA label.

Then create you own custom resource to hold your menus tree-walkers and common content. Tree-walkers will be created using RZ\Roadiz\CoreBundle\Api\TreeWalker\TreeWalkerGenerator service. TreeWalkerGenerator will create a App\TreeWalker\MenuNodeSourceWalker instance for each node source of type Menu located on your website root.

<?php

declare(strict_types=1);

namespace App\Controller;

use App\Api\Model\CommonContent;
use App\TreeWalker\MenuNodeSourceWalker;
use Doctrine\Persistence\ManagerRegistry;
use RZ\Roadiz\Core\AbstractEntities\TranslationInterface;
use RZ\Roadiz\CoreBundle\Api\Model\NodesSourcesHeadFactoryInterface;
use RZ\Roadiz\CoreBundle\Api\TreeWalker\TreeWalkerGenerator;
use RZ\Roadiz\CoreBundle\Preview\PreviewResolverInterface;
use RZ\Roadiz\CoreBundle\Repository\TranslationRepository;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\Routing\Exception\ResourceNotFoundException;

final class GetCommonContentController extends AbstractController
{
    private RequestStack $requestStack;
    private ManagerRegistry $managerRegistry;
    private NodesSourcesHeadFactoryInterface $nodesSourcesHeadFactory;
    private PreviewResolverInterface $previewResolver;
    private TreeWalkerGenerator $treeWalkerGenerator;

    public function __construct(
        RequestStack $requestStack,
        ManagerRegistry $managerRegistry,
        NodesSourcesHeadFactoryInterface $nodesSourcesHeadFactory,
        PreviewResolverInterface $previewResolver,
        TreeWalkerGenerator $treeWalkerGenerator
    ) {
        $this->requestStack = $requestStack;
        $this->managerRegistry = $managerRegistry;
        $this->nodesSourcesHeadFactory = $nodesSourcesHeadFactory;
        $this->previewResolver = $previewResolver;
        $this->treeWalkerGenerator = $treeWalkerGenerator;
    }

    public function __invoke(): ?CommonContent
    {
        try {
            $request = $this->requestStack->getMainRequest();
            $translation = $this->getTranslationFromRequest($request);

            $resource = new CommonContent();

            $request?->attributes->set('data', $resource);
            $resource->head = $this->nodesSourcesHeadFactory->createForTranslation($translation);
            $resource->home = $resource->head->getHomePage();
            $resource->menus = $this->treeWalkerGenerator->getTreeWalkersForTypeAtRoot(
                'Menu',
                MenuNodeSourceWalker::class,
                $translation,
                3
            );
            return $resource;
        } catch (ResourceNotFoundException $exception) {
            throw new NotFoundHttpException($exception->getMessage(), $exception);
        }
    }

    protected function getTranslationFromRequest(?Request $request): TranslationInterface
    {
        $locale = null;

        if (null !== $request) {
            $locale = $request->query->get('_locale');

            /*
             * If no _locale query param is defined check Accept-Language header
             */
            if (null === $locale) {
                $locale = $request->getPreferredLanguage($this->getTranslationRepository()->getAllLocales());
            }
        }
        /*
         * Then fallback to default CMS locale
         */
        if (null === $locale) {
            $translation = $this->getTranslationRepository()->findDefault();
        } elseif ($this->previewResolver->isPreview()) {
            $translation = $this->getTranslationRepository()
                ->findOneByLocaleOrOverrideLocale((string) $locale);
        } else {
            $translation = $this->getTranslationRepository()
                ->findOneAvailableByLocaleOrOverrideLocale((string) $locale);
        }
        if (null === $translation) {
            throw new NotFoundHttpException('No translation for locale ' . $locale);
        }
        return $translation;
    }

    protected function getTranslationRepository(): TranslationRepository
    {
        $repository = $this->managerRegistry->getRepository(TranslationInterface::class);
        if (!$repository instanceof TranslationRepository) {
            throw new \RuntimeException(
                'Translation repository must be instance of ' .
                TranslationRepository::class
            );
        }
        return $repository;
    }
}

Then, the following resource will be exposed:

{
    "@context": "/api/contexts/CommonContent",
    "@id": "/api/common_content",
    "@type": "CommonContent",
    "home": {
        "@id": "/api/pages/11",
        "@type": "Page",
        "content": null,
        "image": [],
        "title": "Accueil",
        "publishedAt": "2022-04-12T16:24:00+02:00",
        "node": {
            "@type": "Node",
            "@id": "/api/nodes/10",
            "visible": true,
            "tags": []
        },
        "slug": "accueil",
        "url": "/fr"
    },
    "menus": {
        "mainMenuWalker": {
            "@type": "MenuNodeSourceWalker",
            "@id": "_:3341",
            "children": [],
            "childrenCount": 0,
            "item": {
                "@id": "/api/menus/2",
                "@type": "Menu",
                "title": "Menu principal",
                "publishedAt": "2022-04-12T00:39:00+02:00",
                "node": {
                    "@type": "Node",
                    "@id": "/api/nodes/1",
                    "visible": false,
                    "tags": []
                },
                "slug": "main-menu"
            },
            "level": 0,
            "maxLevel": 3
        },
        "footerMenuWalker": {
            "@type": "MenuNodeSourceWalker",
            "@id": "_:2381",
            "children": [],
            "childrenCount": 0,
            "item": {
                "@id": "/api/menus/3",
                "@type": "Menu",
                "linkInternalReference": [],
                "title": "Menu du pied de page",
                "publishedAt": "2022-04-12T11:18:12+02:00",
                "node": {
                    "@type": "Node",
                    "@id": "/api/nodes/2",
                    "visible": false,
                    "tags": []
                },
                "slug": "footer-menu"
            },
            "level": 0,
            "maxLevel": 3
        },
        "footerWalker": {
            "@type": "AutoChildrenNodeSourceWalker",
            "@id": "_:2377",
            "children": [],
            "childrenCount": 0,
            "item": {
                "@id": "/api/footers/16",
                "@type": "Footer",
                "content": "",
                "title": "Pied de page",
                "publishedAt": "2022-04-12T19:02:47+02:00",
                "node": {
                    "@type": "Node",
                    "@id": "/api/nodes/15",
                    "visible": false,
                    "tags": []
                },
                "slug": "footer"
            },
            "level": 0,
            "maxLevel": 3
        }
    },
    "head": {
        "@type": "NodesSourcesHead",
        "@id": "_:14679",
        "googleAnalytics": null,
        "googleTagManager": null,
        "matomoUrl": null,
        "matomoSiteId": null,
        "siteName": "Roadiz dev website",
        "metaTitle": "Contact – Roadiz dev website",
        "metaDescription": "Contact, Roadiz dev website",
        "policyUrl": null,
        "mainColor": null,
        "facebookUrl": null,
        "instagramUrl": null,
        "twitterUrl": null,
        "youtubeUrl": null,
        "linkedinUrl": null,
        "homePageUrl": "/",
        "shareImage": null
    }
}