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coursecatlib.php
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coursecatlib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Contains class coursecat reponsible for course category operations
*
* @package core
* @subpackage course
* @copyright 2013 Marina Glancy
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* Class to store, cache, render and manage course category
*
* @package core
* @subpackage course
* @copyright 2013 Marina Glancy
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class coursecat implements renderable, cacheable_object, IteratorAggregate {
/** @var coursecat stores pseudo category with id=0. Use coursecat::get(0) to retrieve */
protected static $coursecat0;
const CACHE_COURSE_CONTACTS_TTL = 3600; // do not fetch course contacts more often than once per hour
/** @var array list of all fields and their short name and default value for caching */
protected static $coursecatfields = array(
'id' => array('id', 0),
'name' => array('na', ''),
'idnumber' => array('in', null),
'description' => null, // not cached
'descriptionformat' => null, // not cached
'parent' => array('pa', 0),
'sortorder' => array('so', 0),
'coursecount' => array('cc', 0),
'visible' => array('vi', 1),
'visibleold' => null, // not cached
'timemodified' => null, // not cached
'depth' => array('dh', 1),
'path' => array('ph', null),
'theme' => null, // not cached
);
/** @var int */
protected $id;
/** @var string */
protected $name = '';
/** @var string */
protected $idnumber = null;
/** @var string */
protected $description = false;
/** @var int */
protected $descriptionformat = false;
/** @var int */
protected $parent = 0;
/** @var int */
protected $sortorder = 0;
/** @var int */
protected $coursecount = false;
/** @var int */
protected $visible = 1;
/** @var int */
protected $visibleold = false;
/** @var int */
protected $timemodified = false;
/** @var int */
protected $depth = 0;
/** @var string */
protected $path = '';
/** @var string */
protected $theme = false;
/** @var bool */
protected $fromcache;
// ====== magic methods =======
/**
* Magic setter method, we do not want anybody to modify properties from the outside
*
* @param string $name
* @param mixed $value
*/
public function __set($name, $value) {
debugging('Can not change coursecat instance properties!', DEBUG_DEVELOPER);
}
/**
* Magic method getter, redirects to read only values. Queries from DB the fields that were not cached
*
* @param string $name
* @return mixed
*/
public function __get($name) {
global $DB;
if (array_key_exists($name, self::$coursecatfields)) {
if ($this->$name === false) {
// property was not retrieved from DB, retrieve all not retrieved fields
$notretrievedfields = array_diff_key(self::$coursecatfields, array_filter(self::$coursecatfields));
$record = $DB->get_record('course_categories', array('id' => $this->id),
join(',', array_keys($notretrievedfields)), MUST_EXIST);
foreach ($record as $key => $value) {
$this->$key = $value;
}
}
return $this->$name;
}
debugging('Invalid coursecat property accessed! '.$name, DEBUG_DEVELOPER);
return null;
}
/**
* Full support for isset on our magic read only properties.
*
* @param string $name
* @return bool
*/
public function __isset($name) {
if (array_key_exists($name, self::$coursecatfields)) {
return isset($this->$name);
}
return false;
}
/**
* All properties are read only, sorry.
*
* @param string $name
*/
public function __unset($name) {
debugging('Can not unset coursecat instance properties!', DEBUG_DEVELOPER);
}
/**
* Create an iterator because magic vars can't be seen by 'foreach'.
*
* implementing method from interface IteratorAggregate
*
* @return ArrayIterator
*/
public function getIterator() {
$ret = array();
foreach (self::$coursecatfields as $property => $unused) {
if ($this->$property !== false) {
$ret[$property] = $this->$property;
}
}
return new ArrayIterator($ret);
}
/**
* Constructor
*
* Constructor is protected, use coursecat::get($id) to retrieve category
*
* @param stdClass $record record from DB (may not contain all fields)
* @param bool $fromcache whether it is being restored from cache
*/
protected function __construct(stdClass $record, $fromcache = false) {
context_helper::preload_from_record($record);
foreach ($record as $key => $val) {
if (array_key_exists($key, self::$coursecatfields)) {
$this->$key = $val;
}
}
$this->fromcache = $fromcache;
}
/**
* Returns coursecat object for requested category
*
* If category is not visible to user it is treated as non existing
* unless $alwaysreturnhidden is set to true
*
* If id is 0, the pseudo object for root category is returned (convenient
* for calling other functions such as get_children())
*
* @param int $id category id
* @param int $strictness whether to throw an exception (MUST_EXIST) or
* return null (IGNORE_MISSING) in case the category is not found or
* not visible to current user
* @param bool $alwaysreturnhidden set to true if you want an object to be
* returned even if this category is not visible to the current user
* (category is hidden and user does not have
* 'moodle/category:viewhiddencategories' capability). Use with care!
* @return null|coursecat
*/
public static function get($id, $strictness = MUST_EXIST, $alwaysreturnhidden = false) {
if (!$id) {
if (!isset(self::$coursecat0)) {
$record = new stdClass();
$record->id = 0;
$record->visible = 1;
$record->depth = 0;
$record->path = '';
self::$coursecat0 = new coursecat($record);
}
return self::$coursecat0;
}
$coursecatrecordcache = cache::make('core', 'coursecatrecords');
$coursecat = $coursecatrecordcache->get($id);
if ($coursecat === false) {
if ($records = self::get_records('cc.id = :id', array('id' => $id))) {
$record = reset($records);
$coursecat = new coursecat($record);
// Store in cache
$coursecatrecordcache->set($id, $coursecat);
}
}
if ($coursecat && ($alwaysreturnhidden || $coursecat->is_uservisible())) {
return $coursecat;
} else {
if ($strictness == MUST_EXIST) {
throw new moodle_exception('unknowcategory');
}
}
return null;
}
/**
* Returns the first found category
*
* Note that if there are no categories visible to the current user on the first level,
* the invisible category may be returned
*
* @return coursecat
*/
public static function get_default() {
if ($visiblechildren = self::get(0)->get_children()) {
$defcategory = reset($visiblechildren);
} else {
$toplevelcategories = self::get_tree(0);
$defcategoryid = $toplevelcategories[0];
$defcategory = self::get($defcategoryid, MUST_EXIST, true);
}
return $defcategory;
}
/**
* Restores the object after it has been externally modified in DB for example
* during {@link fix_course_sortorder()}
*/
protected function restore() {
// update all fields in the current object
$newrecord = self::get($this->id, MUST_EXIST, true);
foreach (self::$coursecatfields as $key => $unused) {
$this->$key = $newrecord->$key;
}
}
/**
* Creates a new category either from form data or from raw data
*
* Please note that this function does not verify access control.
*
* Exception is thrown if name is missing or idnumber is duplicating another one in the system.
*
* Category visibility is inherited from parent unless $data->visible = 0 is specified
*
* @param array|stdClass $data
* @param array $editoroptions if specified, the data is considered to be
* form data and file_postupdate_standard_editor() is being called to
* process images in description.
* @return coursecat
* @throws moodle_exception
*/
public static function create($data, $editoroptions = null) {
global $DB, $CFG;
$data = (object)$data;
$newcategory = new stdClass();
$newcategory->descriptionformat = FORMAT_MOODLE;
$newcategory->description = '';
// copy all description* fields regardless of whether this is form data or direct field update
foreach ($data as $key => $value) {
if (preg_match("/^description/", $key)) {
$newcategory->$key = $value;
}
}
if (empty($data->name)) {
throw new moodle_exception('categorynamerequired');
}
if (core_text::strlen($data->name) > 255) {
throw new moodle_exception('categorytoolong');
}
$newcategory->name = $data->name;
// validate and set idnumber
if (!empty($data->idnumber)) {
if (core_text::strlen($data->idnumber) > 100) {
throw new moodle_exception('idnumbertoolong');
}
if ($DB->record_exists('course_categories', array('idnumber' => $data->idnumber))) {
throw new moodle_exception('categoryidnumbertaken');
}
}
if (isset($data->idnumber)) {
$newcategory->idnumber = $data->idnumber;
}
if (isset($data->theme) && !empty($CFG->allowcategorythemes)) {
$newcategory->theme = $data->theme;
}
if (empty($data->parent)) {
$parent = self::get(0);
} else {
$parent = self::get($data->parent, MUST_EXIST, true);
}
$newcategory->parent = $parent->id;
$newcategory->depth = $parent->depth + 1;
// By default category is visible, unless visible = 0 is specified or parent category is hidden
if (isset($data->visible) && !$data->visible) {
// create a hidden category
$newcategory->visible = $newcategory->visibleold = 0;
} else {
// create a category that inherits visibility from parent
$newcategory->visible = $parent->visible;
// in case parent is hidden, when it changes visibility this new subcategory will automatically become visible too
$newcategory->visibleold = 1;
}
$newcategory->sortorder = 0;
$newcategory->timemodified = time();
$newcategory->id = $DB->insert_record('course_categories', $newcategory);
// update path (only possible after we know the category id
$path = $parent->path . '/' . $newcategory->id;
$DB->set_field('course_categories', 'path', $path, array('id' => $newcategory->id));
// We should mark the context as dirty
context_coursecat::instance($newcategory->id)->mark_dirty();
fix_course_sortorder();
// if this is data from form results, save embedded files and update description
$categorycontext = context_coursecat::instance($newcategory->id);
if ($editoroptions) {
$newcategory = file_postupdate_standard_editor($newcategory, 'description', $editoroptions, $categorycontext, 'coursecat', 'description', 0);
// update only fields description and descriptionformat
$updatedata = new stdClass();
$updatedata->id = $newcategory->id;
$updatedata->description = $newcategory->description;
$updatedata->descriptionformat = $newcategory->descriptionformat;
$DB->update_record('course_categories', $updatedata);
}
add_to_log(SITEID, "category", 'add', "editcategory.php?id=$newcategory->id", $newcategory->id);
cache_helper::purge_by_event('changesincoursecat');
return self::get($newcategory->id, MUST_EXIST, true);
}
/**
* Updates the record with either form data or raw data
*
* Please note that this function does not verify access control.
*
* This function calls coursecat::change_parent_raw if field 'parent' is updated.
* It also calls coursecat::hide_raw or coursecat::show_raw if 'visible' is updated.
* Visibility is changed first and then parent is changed. This means that
* if parent category is hidden, the current category will become hidden
* too and it may overwrite whatever was set in field 'visible'.
*
* Note that fields 'path' and 'depth' can not be updated manually
* Also coursecat::update() can not directly update the field 'sortoder'
*
* @param array|stdClass $data
* @param array $editoroptions if specified, the data is considered to be
* form data and file_postupdate_standard_editor() is being called to
* process images in description.
* @throws moodle_exception
*/
public function update($data, $editoroptions = null) {
global $DB, $CFG;
if (!$this->id) {
// there is no actual DB record associated with root category
return;
}
$data = (object)$data;
$newcategory = new stdClass();
$newcategory->id = $this->id;
// copy all description* fields regardless of whether this is form data or direct field update
foreach ($data as $key => $value) {
if (preg_match("/^description/", $key)) {
$newcategory->$key = $value;
}
}
if (isset($data->name) && empty($data->name)) {
throw new moodle_exception('categorynamerequired');
}
if (!empty($data->name) && $data->name !== $this->name) {
if (core_text::strlen($data->name) > 255) {
throw new moodle_exception('categorytoolong');
}
$newcategory->name = $data->name;
}
if (isset($data->idnumber) && $data->idnumber != $this->idnumber) {
if (core_text::strlen($data->idnumber) > 100) {
throw new moodle_exception('idnumbertoolong');
}
if ($DB->record_exists('course_categories', array('idnumber' => $data->idnumber))) {
throw new moodle_exception('categoryidnumbertaken');
}
$newcategory->idnumber = $data->idnumber;
}
if (isset($data->theme) && !empty($CFG->allowcategorythemes)) {
$newcategory->theme = $data->theme;
}
$changes = false;
if (isset($data->visible)) {
if ($data->visible) {
$changes = $this->show_raw();
} else {
$changes = $this->hide_raw(0);
}
}
if (isset($data->parent) && $data->parent != $this->parent) {
if ($changes) {
cache_helper::purge_by_event('changesincoursecat');
}
$parentcat = self::get($data->parent, MUST_EXIST, true);
$this->change_parent_raw($parentcat);
fix_course_sortorder();
}
$newcategory->timemodified = time();
if ($editoroptions) {
$categorycontext = context_coursecat::instance($this->id);
$newcategory = file_postupdate_standard_editor($newcategory, 'description', $editoroptions, $categorycontext, 'coursecat', 'description', 0);
}
$DB->update_record('course_categories', $newcategory);
add_to_log(SITEID, "category", 'update', "editcategory.php?id=$this->id", $this->id);
fix_course_sortorder();
// purge cache even if fix_course_sortorder() did not do it
cache_helper::purge_by_event('changesincoursecat');
// update all fields in the current object
$this->restore();
}
/**
* Checks if this course category is visible to current user
*
* Please note that methods coursecat::get (without 3rd argumet),
* coursecat::get_children(), etc. return only visible categories so it is
* usually not needed to call this function outside of this class
*
* @return bool
*/
public function is_uservisible() {
return !$this->id || $this->visible ||
has_capability('moodle/category:viewhiddencategories',
context_coursecat::instance($this->id));
}
/**
* Returns all categories visible to the current user
*
* This is a generic function that returns an array of
* (category id => coursecat object) sorted by sortorder
*
* @see coursecat::get_children()
* @see coursecat::get_all_parents()
*
* @return cacheable_object_array array of coursecat objects
*/
public static function get_all_visible() {
global $USER;
$coursecatcache = cache::make('core', 'coursecat');
$ids = $coursecatcache->get('user'. $USER->id);
if ($ids === false) {
$all = self::get_all_ids();
$parentvisible = $all[0];
$rv = array();
foreach ($all as $id => $children) {
if ($id && in_array($id, $parentvisible) &&
($coursecat = self::get($id, IGNORE_MISSING)) &&
(!$coursecat->parent || isset($rv[$coursecat->parent]))) {
$rv[$id] = $coursecat;
$parentvisible += $children;
}
}
$coursecatcache->set('user'. $USER->id, array_keys($rv));
} else {
$rv = array();
foreach ($ids as $id) {
if ($coursecat = self::get($id, IGNORE_MISSING)) {
$rv[$id] = $coursecat;
}
}
}
return $rv;
}
/**
* Returns the entry from categories tree and makes sure the application-level tree cache is built
*
* The following keys can be requested:
*
* 'countall' - total number of categories in the system (always present)
* 0 - array of ids of top-level categories (always present)
* '0i' - array of ids of top-level categories that have visible=0 (always present but may be empty array)
* $id (int) - array of ids of categories that are direct children of category with id $id. If
* category with id $id does not exist returns false. If category has no children returns empty array
* $id.'i' - array of ids of children categories that have visible=0
*
* @param int|string $id
* @return mixed
*/
protected static function get_tree($id) {
global $DB;
$coursecattreecache = cache::make('core', 'coursecattree');
$rv = $coursecattreecache->get($id);
if ($rv !== false) {
return $rv;
}
// We did not find the entry in cache but it also can mean that tree is not built.
// The keys 0 and 'countall' must always be present if tree is built.
if ($id !== 0 && $id !== 'countall' && $coursecattreecache->has('countall')) {
// Tree was built, it means the non-existing $id was requested.
return false;
}
// Re-build the tree.
$sql = "SELECT cc.id, cc.parent, cc.visible
FROM {course_categories} cc
ORDER BY cc.sortorder";
$rs = $DB->get_recordset_sql($sql, array());
$all = array(0 => array(), '0i' => array());
$count = 0;
foreach ($rs as $record) {
$all[$record->id] = array();
$all[$record->id. 'i'] = array();
if (array_key_exists($record->parent, $all)) {
$all[$record->parent][] = $record->id;
if (!$record->visible) {
$all[$record->parent. 'i'][] = $record->id;
}
} else {
// parent not found. This is data consistency error but next fix_course_sortorder() should fix it
$all[0][] = $record->id;
}
$count++;
}
$rs->close();
if (!$count) {
// No categories found.
// This may happen after upgrade from very old moodle version. In new versions the default category is created on install.
$defcoursecat = self::create(array('name' => get_string('miscellaneous')));
set_config('defaultrequestcategory', $defcoursecat->id);
$all[0] = array($defcoursecat->id);
$all[$defcoursecat->id] = array();
$count++;
}
$all['countall'] = $count;
foreach ($all as $key => $children) {
$coursecattreecache->set($key, $children);
}
if (array_key_exists($id, $all)) {
return $all[$id];
}
return false;
}
/**
* Returns number of ALL categories in the system regardless if
* they are visible to current user or not
*
* @return int
*/
public static function count_all() {
return self::get_tree('countall');
}
/**
* Retrieves number of records from course_categories table
*
* Only cached fields are retrieved. Records are ready for preloading context
*
* @param string $whereclause
* @param array $params
* @return array array of stdClass objects
*/
protected static function get_records($whereclause, $params) {
global $DB;
// Retrieve from DB only the fields that need to be stored in cache
$fields = array_keys(array_filter(self::$coursecatfields));
$ctxselect = context_helper::get_preload_record_columns_sql('ctx');
$sql = "SELECT cc.". join(',cc.', $fields). ", $ctxselect
FROM {course_categories} cc
JOIN {context} ctx ON cc.id = ctx.instanceid AND ctx.contextlevel = :contextcoursecat
WHERE ". $whereclause." ORDER BY cc.sortorder";
return $DB->get_records_sql($sql,
array('contextcoursecat' => CONTEXT_COURSECAT) + $params);
}
/**
* Given list of DB records from table course populates each record with list of users with course contact roles
*
* This function fills the courses with raw information as {@link get_role_users()} would do.
* See also {@link course_in_list::get_course_contacts()} for more readable return
*
* $courses[$i]->managers = array(
* $roleassignmentid => $roleuser,
* ...
* );
*
* where $roleuser is an stdClass with the following properties:
*
* $roleuser->raid - role assignment id
* $roleuser->id - user id
* $roleuser->username
* $roleuser->firstname
* $roleuser->lastname
* $roleuser->rolecoursealias
* $roleuser->rolename
* $roleuser->sortorder - role sortorder
* $roleuser->roleid
* $roleuser->roleshortname
*
* @todo MDL-38596 minimize number of queries to preload contacts for the list of courses
*
* @param array $courses
*/
public static function preload_course_contacts(&$courses) {
global $CFG, $DB;
if (empty($courses) || empty($CFG->coursecontact)) {
return;
}
$managerroles = explode(',', $CFG->coursecontact);
$cache = cache::make('core', 'coursecontacts');
$cacheddata = $cache->get_many(array_merge(array('basic'), array_keys($courses)));
// check if cache was set for the current course contacts and it is not yet expired
if (empty($cacheddata['basic']) || $cacheddata['basic']['roles'] !== $CFG->coursecontact ||
$cacheddata['basic']['lastreset'] < time() - self::CACHE_COURSE_CONTACTS_TTL) {
// reset cache
$cache->purge();
$cache->set('basic', array('roles' => $CFG->coursecontact, 'lastreset' => time()));
$cacheddata = $cache->get_many(array_merge(array('basic'), array_keys($courses)));
}
$courseids = array();
foreach (array_keys($courses) as $id) {
if ($cacheddata[$id] !== false) {
$courses[$id]->managers = $cacheddata[$id];
} else {
$courseids[] = $id;
}
}
// $courseids now stores list of ids of courses for which we still need to retrieve contacts
if (empty($courseids)) {
return;
}
// first build the array of all context ids of the courses and their categories
$allcontexts = array();
foreach ($courseids as $id) {
$context = context_course::instance($id);
$courses[$id]->managers = array();
foreach (preg_split('|/|', $context->path, 0, PREG_SPLIT_NO_EMPTY) as $ctxid) {
if (!isset($allcontexts[$ctxid])) {
$allcontexts[$ctxid] = array();
}
$allcontexts[$ctxid][] = $id;
}
}
// fetch list of all users with course contact roles in any of the courses contexts or parent contexts
list($sql1, $params1) = $DB->get_in_or_equal(array_keys($allcontexts), SQL_PARAMS_NAMED, 'ctxid');
list($sql2, $params2) = $DB->get_in_or_equal($managerroles, SQL_PARAMS_NAMED, 'rid');
list($sort, $sortparams) = users_order_by_sql('u');
$notdeleted = array('notdeleted'=>0);
$allnames = get_all_user_name_fields(true, 'u');
$sql = "SELECT ra.contextid, ra.id AS raid,
r.id AS roleid, r.name AS rolename, r.shortname AS roleshortname,
rn.name AS rolecoursealias, u.id, u.username, $allnames
FROM {role_assignments} ra
JOIN {user} u ON ra.userid = u.id
JOIN {role} r ON ra.roleid = r.id
LEFT JOIN {role_names} rn ON (rn.contextid = ra.contextid AND rn.roleid = r.id)
WHERE ra.contextid ". $sql1." AND ra.roleid ". $sql2." AND u.deleted = :notdeleted
ORDER BY r.sortorder, $sort";
$rs = $DB->get_recordset_sql($sql, $params1 + $params2 + $notdeleted + $sortparams);
$checkenrolments = array();
foreach($rs as $ra) {
foreach ($allcontexts[$ra->contextid] as $id) {
$courses[$id]->managers[$ra->raid] = $ra;
if (!isset($checkenrolments[$id])) {
$checkenrolments[$id] = array();
}
$checkenrolments[$id][] = $ra->id;
}
}
$rs->close();
// remove from course contacts users who are not enrolled in the course
$enrolleduserids = self::ensure_users_enrolled($checkenrolments);
foreach ($checkenrolments as $id => $userids) {
if (empty($enrolleduserids[$id])) {
$courses[$id]->managers = array();
} else if ($notenrolled = array_diff($userids, $enrolleduserids[$id])) {
foreach ($courses[$id]->managers as $raid => $ra) {
if (in_array($ra->id, $notenrolled)) {
unset($courses[$id]->managers[$raid]);
}
}
}
}
// set the cache
$values = array();
foreach ($courseids as $id) {
$values[$id] = $courses[$id]->managers;
}
$cache->set_many($values);
}
/**
* Verify user enrollments for multiple course-user combinations
*
* @param array $courseusers array where keys are course ids and values are array
* of users in this course whose enrolment we wish to verify
* @return array same structure as input array but values list only users from input
* who are enrolled in the course
*/
protected static function ensure_users_enrolled($courseusers) {
global $DB;
// If the input array is too big, split it into chunks
$maxcoursesinquery = 20;
if (count($courseusers) > $maxcoursesinquery) {
$rv = array();
for ($offset = 0; $offset < count($courseusers); $offset += $maxcoursesinquery) {
$chunk = array_slice($courseusers, $offset, $maxcoursesinquery, true);
$rv = $rv + self::ensure_users_enrolled($chunk);
}
return $rv;
}
// create a query verifying valid user enrolments for the number of courses
$sql = "SELECT DISTINCT e.courseid, ue.userid
FROM {user_enrolments} ue
JOIN {enrol} e ON e.id = ue.enrolid
WHERE ue.status = :active
AND e.status = :enabled
AND ue.timestart < :now1 AND (ue.timeend = 0 OR ue.timeend > :now2)";
$now = round(time(), -2); // rounding helps caching in DB
$params = array('enabled' => ENROL_INSTANCE_ENABLED,
'active' => ENROL_USER_ACTIVE,
'now1' => $now, 'now2' => $now);
$cnt = 0;
$subsqls = array();
$enrolled = array();
foreach ($courseusers as $id => $userids) {
$enrolled[$id] = array();
if (count($userids)) {
list($sql2, $params2) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'userid'.$cnt.'_');
$subsqls[] = "(e.courseid = :courseid$cnt AND ue.userid ".$sql2.")";
$params = $params + array('courseid'.$cnt => $id) + $params2;
$cnt++;
}
}
if (count($subsqls)) {
$sql .= "AND (". join(' OR ', $subsqls).")";
$rs = $DB->get_recordset_sql($sql, $params);
foreach ($rs as $record) {
$enrolled[$record->courseid][] = $record->userid;
}
$rs->close();
}
return $enrolled;
}
/**
* Retrieves number of records from course table
*
* Not all fields are retrieved. Records are ready for preloading context
*
* @param string $whereclause
* @param array $params
* @param array $options may indicate that summary and/or coursecontacts need to be retrieved
* @param bool $checkvisibility if true, capability 'moodle/course:viewhiddencourses' will be checked
* on not visible courses
* @return array array of stdClass objects
*/
protected static function get_course_records($whereclause, $params, $options, $checkvisibility = false) {
global $DB;
$ctxselect = context_helper::get_preload_record_columns_sql('ctx');
$fields = array('c.id', 'c.category', 'c.sortorder',
'c.shortname', 'c.fullname', 'c.idnumber',
'c.startdate', 'c.visible');
if (!empty($options['summary'])) {
$fields[] = 'c.summary';
$fields[] = 'c.summaryformat';
} else {
$fields[] = $DB->sql_substr('c.summary', 1, 1). ' as hassummary';
}
$sql = "SELECT ". join(',', $fields). ", $ctxselect
FROM {course} c
JOIN {context} ctx ON c.id = ctx.instanceid AND ctx.contextlevel = :contextcourse
WHERE ". $whereclause." ORDER BY c.sortorder";
$list = $DB->get_records_sql($sql,
array('contextcourse' => CONTEXT_COURSE) + $params);
if ($checkvisibility) {
// Loop through all records and make sure we only return the courses accessible by user.
foreach ($list as $course) {
if (isset($list[$course->id]->hassummary)) {
$list[$course->id]->hassummary = strlen($list[$course->id]->hassummary) > 0;
}
if (empty($course->visible)) {
// load context only if we need to check capability
context_helper::preload_from_record($course);
if (!has_capability('moodle/course:viewhiddencourses', context_course::instance($course->id))) {
unset($list[$course->id]);
}
}
}
}
// preload course contacts if necessary
if (!empty($options['coursecontacts'])) {
self::preload_course_contacts($list);
}
return $list;
}
/**
* Returns array of ids of children categories that current user can not see
*
* This data is cached in user session cache
*
* @return array
*/
protected function get_not_visible_children_ids() {
global $DB;
$coursecatcache = cache::make('core', 'coursecat');
if (($invisibleids = $coursecatcache->get('ic'. $this->id)) === false) {
// we never checked visible children before
$hidden = self::get_tree($this->id.'i');
$invisibleids = array();
if ($hidden) {
// preload categories contexts
list($sql, $params) = $DB->get_in_or_equal($hidden, SQL_PARAMS_NAMED, 'id');
$ctxselect = context_helper::get_preload_record_columns_sql('ctx');
$contexts = $DB->get_records_sql("SELECT $ctxselect FROM {context} ctx
WHERE ctx.contextlevel = :contextcoursecat AND ctx.instanceid ".$sql,
array('contextcoursecat' => CONTEXT_COURSECAT) + $params);
foreach ($contexts as $record) {
context_helper::preload_from_record($record);
}
// check that user has 'viewhiddencategories' capability for each hidden category
foreach ($hidden as $id) {
if (!has_capability('moodle/category:viewhiddencategories', context_coursecat::instance($id))) {
$invisibleids[] = $id;
}
}
}
$coursecatcache->set('ic'. $this->id, $invisibleids);
}
return $invisibleids;
}
/**
* Sorts list of records by several fields
*
* @param array $records array of stdClass objects
* @param array $sortfields assoc array where key is the field to sort and value is 1 for asc or -1 for desc
* @return int
*/
protected static function sort_records(&$records, $sortfields) {
if (empty($records)) {
return;
}
// If sorting by course display name, calculate it (it may be fullname or shortname+fullname)
if (array_key_exists('displayname', $sortfields)) {
foreach ($records as $key => $record) {
if (!isset($record->displayname)) {
$records[$key]->displayname = get_course_display_name_for_list($record);
}
}
}
// sorting by one field - use core_collator
if (count($sortfields) == 1) {
$property = key($sortfields);
if (in_array($property, array('sortorder', 'id', 'visible', 'parent', 'depth'))) {
$sortflag = core_collator::SORT_NUMERIC;
} else if (in_array($property, array('idnumber', 'displayname', 'name', 'shortname', 'fullname'))) {
$sortflag = core_collator::SORT_STRING;
} else {
$sortflag = core_collator::SORT_REGULAR;
}
core_collator::asort_objects_by_property($records, $property, $sortflag);
if ($sortfields[$property] < 0) {
$records = array_reverse($records, true);
}
return;
}
$records = coursecat_sortable_records::sort($records, $sortfields);
}
/**
* Returns array of children categories visible to the current user
*
* @param array $options options for retrieving children
* - sort - list of fields to sort. Example
* array('idnumber' => 1, 'name' => 1, 'id' => -1)
* will sort by idnumber asc, name asc and id desc.
* Default: array('sortorder' => 1)
* Only cached fields may be used for sorting!
* - offset
* - limit - maximum number of children to return, 0 or null for no limit
* @return array of coursecat objects indexed by category id
*/
public function get_children($options = array()) {
global $DB;
$coursecatcache = cache::make('core', 'coursecat');
// get default values for options
if (!empty($options['sort']) && is_array($options['sort'])) {
$sortfields = $options['sort'];
} else {
$sortfields = array('sortorder' => 1);
}
$limit = null;
if (!empty($options['limit']) && (int)$options['limit']) {
$limit = (int)$options['limit'];
}
$offset = 0;
if (!empty($options['offset']) && (int)$options['offset']) {
$offset = (int)$options['offset'];
}
// first retrieve list of user-visible and sorted children ids from cache
$sortedids = $coursecatcache->get('c'. $this->id. ':'. serialize($sortfields));
if ($sortedids === false) {
$sortfieldskeys = array_keys($sortfields);
if ($sortfieldskeys[0] === 'sortorder') {
// no DB requests required to build the list of ids sorted by sortorder.
// We can easily ignore other sort fields because sortorder is always different
$sortedids = self::get_tree($this->id);
if ($sortedids && ($invisibleids = $this->get_not_visible_children_ids())) {
$sortedids = array_diff($sortedids, $invisibleids);
if ($sortfields['sortorder'] == -1) {
$sortedids = array_reverse($sortedids, true);
}
}
} else {
// we need to retrieve and sort all children. Good thing that it is done only on first request
if ($invisibleids = $this->get_not_visible_children_ids()) {
list($sql, $params) = $DB->get_in_or_equal($invisibleids, SQL_PARAMS_NAMED, 'id', false);
$records = self::get_records('cc.parent = :parent AND cc.id '. $sql,
array('parent' => $this->id) + $params);
} else {
$records = self::get_records('cc.parent = :parent', array('parent' => $this->id));
}
self::sort_records($records, $sortfields);
$sortedids = array_keys($records);
}