overblog / GraphQLBundle

     *

     * @return Connection

     */

    public function backward($args, $total)

    {

        $args = $this->protectArgs($args);

        $limit = $args['last'];

        $offset = max(0, ConnectionBuilder::getOffsetWithDefault($args['before'], $total) - $limit);

        $entities = call_user_func($this->fetcher, $offset, $limit);

        return ConnectionBuilder::connectionFromArraySlice($entities, $args, [

            'sliceStart' => $offset,

            'arrayLength' => $total,

        ]);

    }

    /**

     * @param Argument|array $args

     *

     * @return Connection

     */

    public function forward($args)

    {

        $args = $this->protectArgs($args);

        $limit = $args['first'];

        $offset = ConnectionBuilder::getOffsetWithDefault($args['after'], 0);

        // The extra fetched element is here to determine if there is a next page.

        $entities = call_user_func($this->fetcher, $offset, $limit + 1);

        return ConnectionBuilder::connectionFromArraySlice($entities, $args, [

            'sliceStart' => $offset,

            'arrayLength' => $offset + count($entities),

        ]);

    }

    /**

     * @param Argument|array $args