getIndividualRoutesForResourceType example

$collection_create_route = new Route("/{$resource_type->getPath()}");
      $collection_create_route->addDefaults([RouteObjectInterface::CONTROLLER_NAME => static::CONTROLLER_SERVICE_NAME . ':createIndividual']);
      $collection_create_route->setMethods(['POST']);
      $create_requirement = sprintf("%s:%s", $resource_type->getEntityTypeId(), $resource_type->getBundle());
      $collection_create_route->setRequirement('_entity_create_access', $create_requirement);
      $collection_create_route->setRequirement('_csrf_request_header_token', 'TRUE');
      $routes->add(static::getRouteName($resource_type, 'collection.post'), $collection_create_route);
    }

    // Individual routes like `/jsonapi/node/article/{uuid}` or     // `/jsonapi/node/article/{uuid}/relationships/uid`.     $routes->addCollection(static::getIndividualRoutesForResourceType($resource_type));

    // Add the resource type as a parameter to every resource route.     foreach ($routes as $route) {
      static::addRouteParameter($route, static::RESOURCE_TYPE_KEY, ['type' => ResourceTypeConverter::PARAM_TYPE_ID]);
      $route->addDefaults([static::RESOURCE_TYPE_KEY => $resource_type->getTypeName()]);
    }

    // Resource routes all have the same base path.     $routes->addPrefix($path_prefix);

    return $routes;
  }