moodle_local_treestudyplan/classes/teachingfinder.php

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<?php
namespace local_treestudyplan;
class teachingfinder {
const TABLE = "local_treestudyplan_teachers";
public static function list_my_plans(){
global $USER,$DB;
$userid = $USER->id;
$records = $DB->get_records(self::TABLE,['teacher_id' => $userid]);
if(count($records) == 0){
// initiate a search if the cache is empty
self::update_teaching_cache($userid);
$DB->get_records(self::TABLE,['teacher_id' => $userid]);
}
$list = [];
foreach($records as $r){
$list[] = studyplan::findById($r->studyplan_id);
}
return $list;
}
/**
* Find The active studyplans where the specified user is a teacher
* (Has the mod/assign::grade capability in one of the linked courses)
* TODO: OPTIMIZE THIS CHECK!!!
*/
public static function update_teaching_cache($userid){
global $DB;
$list = [];
// First find all active study plans
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$sql = "SELECT p.id FROM {local_treestudyplan_page} p
WHERE startdate <= NOW() and enddate >= NOW()";
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$page_ids = $DB->get_fieldset_sql($sql, []);
// then parse them to see if the user has the grading permission in any of them
// (Which would make them a teacher for all intents and purposes)
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foreach($page_ids as $page_id) {
$sql = "SELECT i.course_id FROM {local_treestudyplan_item} i
INNER JOIN {local_treestudyplan_line} l ON i.line_id = l.id
WHERE l.page_id = :page_id AND i.course_id IS NOT NULL";
$course_ids = $DB->get_fieldset_sql($sql, ["page_id" => $page_id]);
$linked = false;
foreach($course_ids as $cid){
$coursecontext = \context_course::instance($cid);
if (is_enrolled($coursecontext, $userid, 'mod/assign:grade')){
$linked = true;
break; // No need to search further
}
}
if($linked)
{
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$list[] = $page_id;
}
}
// Now, clear the database of all records for this user
$DB->delete_records(self::TABLE,["teacher_id"=>$userid]);
// And add new records for the found studyplans
$now = time();
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foreach($list as $page_id){
// Retrieve the studyplan id from the page
//TODO: Change this when page management is implemented to return the page instead of the plan
$planid = $DB->get_field("local_treestudyplan_page","studyplan_id",["page_id" => $page_id]);
$DB->insert_record(self::TABLE,["teacher_id"=>$userid,"studyplan_id"=>$planid,"update_time"=>$now]);
}
return $list;
}
public static function list_teacher_ids(){
global $DB;
return $DB->get_fieldset_sql("SELECT DISTINCT teacher_id FROM {".self::TABLE."}");
}
public static function get_update_time($teacher_id): int {
global $DB;
$r = $DB->get_field_sql("SELECT MIN(update_time)FROM {".self::TABLE."} WHERE teacher_id=:teacher_id",
["teacher_id" => $teacher_id]);
return (int)($r->update_time);
}
}