tarantool-php / mapper

            }

        }

        foreach ($config['fields'] as $property) {

            if (!$this->getPropertyType($property)) {

                throw new Exception("Unknown property $property", 1);

            }

            $options['parts'][] = $this->getPropertyIndex($property)+1;

            $options['parts'][] = $this->getPropertyType($property);

        }

        $name = array_key_exists('name', $config) ? $config['name'] : implode('_', $config['fields']);

    {

        $key = [];

        foreach ($this->getPrimaryIndex()['parts'] as $part) {

            $name = $this->getFormat()[$part[0]]['name'];

            if (!property_exists($instance, $name)) {

                throw new Exception("Field $name is undefined", 1);

            }

            $key[] = $instance->$name;

        }

        return count($key) == 1 ? $key[0] : implode(':', $key);

    }