How to hack your pagination - a guide

PageController.php

<?php

## use statments ##

class PageController extends BasePageController
{

    public const PAGE_LENGTH = 10;
    public const BIG_PAGE_LENGTH = 100;

    public function results($data, $form, $request)
    {
        $keywords = $data['Search'];
        $service = Injector::inst()->get(AppSearchService::class);
        $query = Injector::inst()->create(SearchQuery::class);
        $query->setQuery($keywords);
        $start = $request->getVar('start');
        // Elastic will only let you have 100 pages, so 100 pages of 10 results is the max
        // Instead, we request in batches of 100
        if ($start >= 1000) {
            $query->setPagination(self::BIG_PAGE_LENGTH, ($start / self::BIG_PAGE_LENGTH) + 1);
        }

        $results = null;

        try {
            $results = $service->search($query, $this->getElasticEngineName(), $this->getRequest());
        } catch (Exception $e) {
            Injector::inst()->get(LoggerInterface::class)->error(
                'Error calling ElasticSearch Service for Keywords in Document Library',
                ['exception' => $e]
            );
        }
      
        $resultsList = '';
      
        if ($start >= 1000) {
            // If we have hacked the pagination, hack it back
            $resultsList = $results->getResults();
            $resultsList->setPageLength(self::PAGE_LENGTH);
            $resultsList->setPageStart($start);

            // Make sure we reset the underlying list with an updated offset
            $resultsList->setList(
                $resultsList->getList()->limit(self::PAGE_LENGTH, $start % self::BIG_PAGE_LENGTH)
            );
        } elseif ($results) {
            $resultsList = $results->getResults();
        }


        $this->customise(
            [
                'Keywords' => $keywords,
                'Results' => $resultsList,
            ]
        );
      
    }

}