calendar-bundle/src/Resources/contao/dca/tl_calendar_feed.php
public function getAllowedCalendars()
	{
		if ($this->User->isAdmin)
		{
			$objCalendar = Contao\CalendarModel::findAll();
		}
		else
		{
			$objCalendar = Contao\CalendarModel::findMultipleByIds($this->User->calendars);
		}

		$return = array();

		if ($objCalendar !== null)
		{
			while ($objCalendar->next())
			{
				$return[$objCalendar->id] = $objCalendar->title;
			}
		}

		return $return;
	}
public function getAllowedCalendars()
	{
		if ($this->User->isAdmin)
		{
			$objCalendar = Contao\CalendarModel::findAll();
		}
		else
		{
			$objCalendar = Contao\CalendarModel::findMultipleByIds($this->User->calendars);
		}

		$return = array();

		if ($objCalendar !== null)
		{
			while ($objCalendar->next())
			{
				$return[$objCalendar->id] = $objCalendar->title;
			}
		}

		return $return;
	}
Return the IDs of the allowed calendars as array

@return array