/**
* This function helps move a question cateogry to a new context by moving all
* the files belonging to all the questions to the new context.
* Also moves subcategories.
* @param integer $categoryid the id of the category being moved.
* @param integer $oldcontextid the old context id.
* @param integer $newcontextid the new context id.
*/
function question_move_category_to_context($categoryid, $oldcontextid, $newcontextid)
{
global $DB;
$questionids = $DB->get_records_menu('question', array('category' => $categoryid), '', 'id,qtype');
foreach ($questionids as $questionid => $qtype) {
question_bank::get_qtype($qtype)->move_files($questionid, $oldcontextid, $newcontextid);
// Purge this question from the cache.
question_bank::notify_question_edited($questionid);
}
core_tag_tag::change_items_context('core_question', 'question', array_keys($questionids), $newcontextid);
$subcatids = $DB->get_records_menu('question_categories', array('parent' => $categoryid), '', 'id,1');
foreach ($subcatids as $subcatid => $notused) {
$DB->set_field('question_categories', 'contextid', $newcontextid, array('id' => $subcatid));
question_move_category_to_context($subcatid, $oldcontextid, $newcontextid);
}
}
