ApiPlatform\Core\Bridge\NelmioApiDoc\Parser\ApiPlatformParser::parseProperty PHP Method

    private function parseProperty(ResourceMetadata $resourceMetadata, PropertyMetadata $propertyMetadata, $io, Type $type = null, array $visited = [])
    {
        $data = ['dataType' => null, 'required' => $propertyMetadata->isRequired(), 'description' => $propertyMetadata->getDescription(), 'readonly' => !$propertyMetadata->isWritable()];
        if (null === $type && null === ($type = $propertyMetadata->getType())) {
            // Default to string
            $data['dataType'] = DataTypes::STRING;
            return $data;
        }
        if ($type->isCollection()) {
            $data['actualType'] = DataTypes::COLLECTION;
            if ($collectionType = $type->getCollectionValueType()) {
                $subProperty = $this->parseProperty($resourceMetadata, $propertyMetadata, $io, $collectionType, $visited);
                if (self::TYPE_IRI === $subProperty['dataType']) {
                    $data['dataType'] = 'array of IRIs';
                    $data['subType'] = DataTypes::STRING;
                    return $data;
                }
                $data['subType'] = $subProperty['subType'];
                if (isset($subProperty['children'])) {
                    $data['children'] = $subProperty['children'];
                }
            }
            return $data;
        }
        $builtinType = $type->getBuiltinType();
        if ('object' === $builtinType) {
            $className = $type->getClassName();
            if (is_subclass_of($className, \DateTimeInterface::class)) {
                $data['dataType'] = DataTypes::DATETIME;
                $data['format'] = sprintf('{DateTime %s}', \DateTime::RFC3339);
                return $data;
            }
            try {
                $this->resourceMetadataFactory->create($className);
            } catch (ResourceClassNotFoundException $e) {
                $data['actualType'] = DataTypes::MODEL;
                $data['subType'] = $className;
                return $data;
            }
            if (self::OUT_PREFIX === $io && true !== $propertyMetadata->isReadableLink() || self::IN_PREFIX === $io && true !== $propertyMetadata->isWritableLink()) {
                $data['dataType'] = self::TYPE_IRI;
                $data['actualType'] = DataTypes::STRING;
                return $data;
            }
            $data['actualType'] = DataTypes::MODEL;
            $data['subType'] = $className;
            $data['children'] = in_array($className, $visited) ? [] : $this->parseResource($resourceMetadata, $className, $io);
            return $data;
        }
        $data['dataType'] = self::TYPE_MAP[$builtinType] ?? DataTypes::STRING;
        return $data;
    }