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<?php
/******************* delete ************************************/
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
confirm_sesskey();
$pageid = required_param('pageid', PARAM_INT);
if (!$thispage = get_record("lesson_pages", "id", $pageid)) {
error("Delete: page record not found");
}
print_string("deleting", "lesson");
// first delete all the associated records...
delete_records("lesson_attempts", "pageid", $pageid);
// ...now delete the answers...
delete_records("lesson_answers", "pageid", $pageid);
// ..and the page itself
delete_records("lesson_pages", "id", $pageid);
// repair the hole in the linkage
if (!$thispage->prevpageid) {
// this is the first page...
if (!$page = get_record("lesson_pages", "id", $thispage->nextpageid)) {
error("Delete: next page not found");
}
if (!set_field("lesson_pages", "prevpageid", 0, "id", $page->id)) {
error("Delete: unable to set prevpage link");
}
} elseif (!$thispage->nextpageid) {
// this is the last page...
if (!$page = get_record("lesson_pages", "id", $thispage->prevpageid)) {
error("Delete: prev page not found");
}
if (!set_field("lesson_pages", "nextpageid", 0, "id", $page->id)) {
error("Delete: unable to set nextpage link");
}
} else {
// page is in the middle...
if (!$prevpage = get_record("lesson_pages", "id", $thispage->prevpageid)) {
error("Delete: prev page not found");
}
if (!$nextpage = get_record("lesson_pages", "id", $thispage->nextpageid)) {
error("Delete: next page not found");
}
if (!set_field("lesson_pages", "nextpageid", $nextpage->id, "id", $prevpage->id)) {
error("Delete: unable to set next link");
}
if (!set_field("lesson_pages", "prevpageid", $prevpage->id, "id", $nextpage->id)) {
error("Delete: unable to set prev link");
}
}
redirect("view.php?id=$cm->id", get_string('deletedpage', 'lesson'));
?>
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