silverstripe-comments/code/admin/CommentsGridFieldBulkAction.php

<?php

/**
 * @package comments
 */
class CommentsGridFieldBulkAction extends GridFieldBulkActionHandler
{
}

/**
 * A {@link GridFieldBulkActionHandler} for bulk marking comments as spam
 *
 * @package comments
 */
class CommentsGridFieldBulkAction_Handlers extends CommentsGridFieldBulkAction
{

    private static $allowed_actions = array(
        'spam',
        'approve',
    );

    private static $url_handlers = array(
        'spam' => 'spam',
        'approve' => 'approve',
    );


    public function spam(SS_HTTPRequest $request)
    {
        $ids = array();

        foreach ($this->getRecords() as $record) {
            array_push($ids, $record->ID);
            $record->markSpam();
        }

        $response = new SS_HTTPResponse(Convert::raw2json(array(
            'done' => true,
            'records' => $ids
        )));

        $response->addHeader('Content-Type', 'text/json');

        return $response;
    }


    public function approve(SS_HTTPRequest $request)
    {
        $ids = array();

        foreach ($this->getRecords() as $record) {
            array_push($ids, $record->ID);
            $record->markApproved();
        }

        $response = new SS_HTTPResponse(Convert::raw2json(array(
            'done' => true,
            'records' => $ids
        )));

        $response->addHeader('Content-Type', 'text/json');

        return $response;
    }
}