public static final function Delete($lesson_id)
{
global $USER_FIELD_MANAGER;
list($lesson_id, $simulate, $check_permissions, $user_id) = self::_funcDelete_ParseOptions($lesson_id);
if ($check_permissions) {
$oAccess = CLearnAccess::GetInstance($user_id);
if (!$oAccess->IsLessonAccessible($lesson_id, CLearnAccess::OP_LESSON_REMOVE)) {
throw new LearnException('EA_ACCESS_DENIED', LearnException::EXC_ERR_ALL_ACCESS_DENIED);
}
}
// Parents and childs of the lesson
$arNeighboursEdges = self::ListImmediateNeighbours($lesson_id);
// precache rights for lesson
if ($check_permissions) {
$IsLessonAccessibleFor_OP_LESSON_UNLINK_DESCENDANTS = $oAccess->IsLessonAccessible($lesson_id, CLearnAccess::OP_LESSON_UNLINK_DESCENDANTS);
$IsLessonAccessibleFor_OP_LESSON_UNLINK_FROM_PARENTS = $oAccess->IsLessonAccessible($lesson_id, CLearnAccess::OP_LESSON_UNLINK_FROM_PARENTS);
}
foreach (GetModuleEvents('learning', 'OnBeforeLessonDelete', true) as $arEvent) {
ExecuteModuleEventEx($arEvent, array($lesson_id));
}
foreach ($arNeighboursEdges as $arEdge) {
$child_lesson_id = (int) $arEdge['CHILD_LESSON'];
$parent_lesson_id = (int) $arEdge['PARENT_LESSON'];
if ($check_permissions) {
$IsLessonAccessible = false;
if ($child_lesson_id === $lesson_id) {
// if we will be remove edge to parent - use precached rights for OP_LESSON_UNLINK_FROM_PARENTS
$IsLessonAccessible = $IsLessonAccessibleFor_OP_LESSON_UNLINK_FROM_PARENTS && $oAccess->IsLessonAccessible($parent_lesson_id, CLearnAccess::OP_LESSON_UNLINK_DESCENDANTS);
} elseif ($parent_lesson_id === $lesson_id) {
// if we will be remove edge to child - use precached rights for OP_LESSON_UNLINK_DESCENDANTS
$IsLessonAccessible = $IsLessonAccessibleFor_OP_LESSON_UNLINK_DESCENDANTS && $oAccess->IsLessonAccessible($child_lesson_id, CLearnAccess::OP_LESSON_UNLINK_FROM_PARENTS);
} else {
throw new LearnException('EA_FATAL: $lesson_id (' . $lesson_id . ') not equal to one of: $child_lesson_id (' . $child_lesson_id . '), $parent_lesson_id (' . $parent_lesson_id . ')', LearnException::EXC_ERR_ALL_LOGIC | LearnException::EXC_ERR_ALL_GIVEUP);
}
if (!$IsLessonAccessible) {
throw new LearnException('EA_ACCESS_DENIED', LearnException::EXC_ERR_ALL_ACCESS_DENIED);
}
if ($simulate === false) {
self::RelationRemove($parent_lesson_id, $child_lesson_id);
}
}
}
$linkedCourseId = self::GetLinkedCourse($lesson_id);
// If lesson is course, remove course
if ($linkedCourseId !== false) {
global $DB;
if ($simulate === false) {
if (!$DB->Query("DELETE FROM b_learn_course_site WHERE COURSE_ID = " . (int) $linkedCourseId, true)) {
throw new LearnException('EA_SQLERROR', LearnException::EXC_ERR_ALL_GIVEUP);
}
$rc = self::CourseBecomeLesson($linkedCourseId);
// if course cannot be converted to lesson - don't remove lesson
if ($rc === false) {
throw new LearnException('EA_OTHER: lesson is unremovable because linked course is in use.', LearnException::EXC_ERR_LL_UNREMOVABLE_CL);
}
// reload cache of LINKED_LESSON_ID -> COURSE_ID
self::GetCourseToLessonMap_ReloadCache();
if (CModule::IncludeModule("search")) {
CSearch::DeleteIndex("learning", false, "C" . $linkedCourseId);
CSearch::DeleteIndex("learning", "C" . $linkedCourseId);
}
}
}
// And remove lesson
if ($simulate === false) {
global $DB;
$r = $DB->Query("SELECT PREVIEW_PICTURE, DETAIL_PICTURE \n\t\t\t\tFROM b_learn_lesson \n\t\t\t\tWHERE ID = " . (int) $lesson_id, true);
if ($r === false) {
throw new LearnException('EA_SQLERROR', LearnException::EXC_ERR_ALL_GIVEUP);
}
$arRes = $r->Fetch();
if (!$arRes) {
throw new LearnException('EA_SQLERROR', LearnException::EXC_ERR_ALL_GIVEUP);
}
CFile::Delete($arRes['PREVIEW_PICTURE']);
CFile::Delete($arRes['DETAIL_PICTURE']);
// Remove questions
$q = CLQuestion::GetList(array(), array('LESSON_ID' => $lesson_id));
while ($arQ = $q->Fetch()) {
if (!CLQuestion::Delete($arQ['ID'])) {
throw new LearnException('EA_QUESTION_NOT_REMOVED', LearnException::EXC_ERR_ALL_GIVEUP);
}
}
CLearnGraphNode::Remove($lesson_id);
$USER_FIELD_MANAGER->delete('LEARNING_LESSONS', $lesson_id);
CLearnCacheOfLessonTreeComponent::MarkAsDirty();
CEventLog::add(array('AUDIT_TYPE_ID' => 'LEARNING_REMOVE_ITEM', 'MODULE_ID' => 'learning', 'ITEM_ID' => 'L #' . $lesson_id, 'DESCRIPTION' => 'lesson removed'));
if (CModule::IncludeModule('search')) {
CSearch::DeleteIndex('learning', false, 'L' . $lesson_id);
CSearch::DeleteIndex('learning', 'L' . $lesson_id);
}
}
if ($simulate === false) {
foreach (GetModuleEvents('learning', 'OnAfterLessonDelete', true) as $arEvent) {
ExecuteModuleEventEx($arEvent, array($lesson_id));
}
}
}