DynamicEntityTypeParamConverterTrait.php

<?php

namespace Drupal\Core\ParamConverter;


/**
 * Provides a trait to replace dynamic entity types in routes.
 */
trait DynamicEntityTypeParamConverterTrait {
    
    /**
     * Determines the entity type ID given a route definition and route defaults.
     *
     * @param mixed $definition
     *   The parameter definition provided in the route options.
     * @param string $name
     *   The name of the parameter.
     * @param array $defaults
     *   The route defaults array.
     *
     * @return string
     *   The entity type ID.
     *
     * @throws \Drupal\Core\ParamConverter\ParamNotConvertedException
     *   Thrown when the dynamic entity type is not found in the route defaults.
     */
    protected function getEntityTypeFromDefaults($definition, $name, array $defaults) {
        $type_part = strstr($definition['type'], ':');
        if (!$type_part) {
            throw new ParamNotConvertedException(sprintf('The type definition "%s" is invalid. The expected format is "entity_revision:<entity_type_id>".', $definition['type']));
        }
        $entity_type_id = substr($type_part, 1);
        // If the entity type is dynamic, it will be pulled from the route defaults.
        if (strpos($entity_type_id, '{') === 0) {
            $entity_type_slug = substr($entity_type_id, 1, -1);
            if (!isset($defaults[$entity_type_slug])) {
                throw new ParamNotConvertedException(sprintf('The "%s" parameter was not converted because the "%s" parameter is missing.', $name, $entity_type_slug));
            }
            $entity_type_id = $defaults[$entity_type_slug];
        }
        return $entity_type_id;
    }

}