protected function addFavorites( array $ids )
	{
		$context = $this->getContext();

		/** client/html/account/favorite/standard/maxitems
		 * Maximum number of products that can be favorites
		 *
		 * This option limits the number of products users can add to their
		 * favorite list. It must be a positive integer value greater than 0.
		 *
		 * @param integer Number of products
		 * @since 2019.04
		 * @category User
		 * @category Developer
		 */
		$max = $context->getConfig()->get( 'client/html/account/favorite/standard/maxitems', 100 );

		$cntl = \Aimeos\Controller\Frontend::create( $context, 'customer' );
		$item = $cntl->uses( ['product' => ['favorite']] )->get();

		if( count( $item->getRefItems( 'product', null, 'favorite' ) ) + count( $ids ) > $max )
		{
			$msg = sprintf( $context->getI18n()->dt( 'client', 'You can only save up to %1$s products as favorites' ), $max );
			throw new \Aimeos\Client\Html\Exception( $msg );
		}

		foreach( $ids as $id )
		{
			if( ( $listItem = $item->getListItem( 'product', 'favorite', $id ) ) === null ) {
				$listItem = $cntl->createListItem();
			}
			$cntl->addListItem( 'product', $listItem->setType( 'favorite' )->setRefId( $id ) );
		}

		$cntl->store();
	}