ElggObject.php

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<?php
class ElggObject extends \ElggEntity {

    public function getType() {
        return 'object';
    }

    protected function prepareObject(\Elgg\Export\Entity $object) {
        $object = parent::prepareObject($object);
        $object->title = $this->getDisplayName();
        $object->description = $this->description;
        $object->tags = $this->tags ? $this->tags : [];
        return $object;
    }
    
    public function getDisplayName() {
        return $this->title;
    }

    public function setDisplayName($display_name) {
        $this->title = $display_name;
    }

    public function canComment($user_guid = 0, $default = null) {
        $result = parent::canComment($user_guid, $default);
        if ($result !== null) {
            return $result;
        }

        if ($user_guid == 0) {
            $user_guid = _elgg_services()->session->getLoggedInUserGuid();
        }

        // must be logged in to comment
        if (!$user_guid) {
            return false;
        }

        // must be member of group
        $container = $this->getContainerEntity();
        if ($container instanceof \ElggGroup) {
            if (!$container->canWriteToContainer($user_guid)) {
                return false;
            }
        }

        // no checks on read access since a user cannot see entities outside his access
        return true;
    }
}