. /** * 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' => null, // not cached '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 (textlib::strlen($data->name) > 255) { throw new moodle_exception('categorytoolong'); } $newcategory->name = $data->name; // validate and set idnumber if (!empty($data->idnumber)) { if (textlib::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 !== $this->name) { if (textlib::strlen($data->name) > 255) { throw new moodle_exception('categorytoolong'); } $newcategory->name = $data->name; } if (isset($data->idnumber) && $data->idnumber != $this->idnumber) { if (textlib::strlen($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); $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, u.firstname, u.lastname 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($record); } } } // sorting by one field - use collatorlib if (count($sortfields) == 1) { $property = key($sortfields); if (in_array($property, array('sortorder', 'id', 'visible', 'parent', 'depth'))) { $sortflag = collatorlib::SORT_NUMERIC; } else if (in_array($property, array('idnumber', 'displayname', 'name', 'shortname', 'fullname'))) { $sortflag = collatorlib::SORT_STRING; } else { $sortflag = collatorlib::SORT_REGULAR; } collatorlib::asort_objects_by_property($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); } $coursecatcache->set('c'. $this->id. ':'.serialize($sortfields), $sortedids); } if (empty($sortedids)) { return array(); } // now retrieive and return categories if ($offset || $limit) { $sortedids = array_slice($sortedids, $offset, $limit); } if (isset($records)) { // easy, we have already retrieved records if ($offset || $limit) { $records = array_slice($records, $offset, $limit, true); } } else { list($sql, $params) = $DB->get_in_or_equal($sortedids, SQL_PARAMS_NAMED, 'id'); $records = self::get_records('cc.id '. $sql, array('parent' => $this->id) + $params); } $rv = array(); foreach ($sortedids as $id) { if (isset($records[$id])) { $rv[$id] = new coursecat($records[$id]); } } return $rv; } /** * Returns number of subcategories visible to the current user * * @return int */ public function get_children_count() { $sortedids = self::get_tree($this->id); $invisibleids = $this->get_not_visible_children_ids(); return count($sortedids) - count($invisibleids); } /** * Returns true if the category has ANY children, including those not visible to the user * * @return boolean */ public function has_children() { $allchildren = self::get_tree($this->id); return !empty($allchildren); } /** * Returns true if the category has courses in it (count does not include courses * in child categories) * * @return bool */ public function has_courses() { global $DB; return $DB->record_exists_sql("select 1 from {course} where category = ?", array($this->id)); } /** * Searches courses * * List of found course ids is cached for 10 minutes. Cache may be purged prior * to this when somebody edits courses or categories, however it is very * difficult to keep track of all possible changes that may affect list of courses. * * @param array $search contains search criterias, such as: * - search - search string * - blocklist - id of block (if we are searching for courses containing specific block0 * - modulelist - name of module (if we are searching for courses containing specific module * - tagid - id of tag * @param array $options display options, same as in get_courses() except 'recursive' is ignored - search is always category-independent * @return array */ public static function search_courses($search, $options = array()) { global $DB; $offset = !empty($options['offset']) ? $options['offset'] : 0; $limit = !empty($options['limit']) ? $options['limit'] : null; $sortfields = !empty($options['sort']) ? $options['sort'] : array('sortorder' => 1); $coursecatcache = cache::make('core', 'coursecat'); $cachekey = 's-'. serialize($search + array('sort' => $sortfields)); $cntcachekey = 'scnt-'. serialize($search); $ids = $coursecatcache->get($cachekey); if ($ids !== false) { // we already cached last search result $ids = array_slice($ids, $offset, $limit); $courses = array(); if (!empty($ids)) { list($sql, $params) = $DB->get_in_or_equal($ids, SQL_PARAMS_NAMED, 'id'); $records = self::get_course_records("c.id ". $sql, $params, $options); foreach ($ids as $id) { $courses[$id] = new course_in_list($records[$id]); } } return $courses; } $preloadcoursecontacts = !empty($options['coursecontacts']); unset($options['coursecontacts']); if (!empty($search['search'])) { // search courses that have specified words in their names/summaries $searchterms = preg_split('|\s+|', trim($search['search']), 0, PREG_SPLIT_NO_EMPTY); $searchterms = array_filter($searchterms, create_function('$v', 'return strlen($v) > 1;')); $courselist = get_courses_search($searchterms, 'c.sortorder ASC', 0, 9999999, $totalcount); self::sort_records($courselist, $sortfields); $coursecatcache->set($cachekey, array_keys($courselist)); $coursecatcache->set($cntcachekey, $totalcount); $records = array_slice($courselist, $offset, $limit, true); } else { if (!empty($search['blocklist'])) { // search courses that have block with specified id $blockname = $DB->get_field('block', 'name', array('id' => $search['blocklist'])); $where = 'ctx.id in (SELECT distinct bi.parentcontextid FROM {block_instances} bi WHERE bi.blockname = :blockname)'; $params = array('blockname' => $blockname); } else if (!empty($search['modulelist'])) { // search courses that have module with specified name $where = "c.id IN (SELECT DISTINCT module.course ". "FROM {".$search['modulelist']."} module)"; $params = array(); } else if (!empty($search['tagid'])) { // search courses that are tagged with the specified tag $where = "c.id IN (SELECT t.itemid ". "FROM {tag_instance} t WHERE t.tagid = :tagid AND t.itemtype = :itemtype)"; $params = array('tagid' => $search['tagid'], 'itemtype' => 'course'); } else { debugging('No criteria is specified while searching courses', DEBUG_DEVELOPER); return array(); } $courselist = self::get_course_records($where, $params, $options, true); self::sort_records($courselist, $sortfields); $coursecatcache->set($cachekey, array_keys($courselist)); $coursecatcache->set($cntcachekey, count($courselist)); $records = array_slice($courselist, $offset, $limit, true); } // Preload course contacts if necessary - saves DB queries later to do it for each course separately. if (!empty($preloadcoursecontacts)) { self::preload_course_contacts($records); } $courses = array(); foreach ($records as $record) { $courses[$record->id] = new course_in_list($record); } return $courses; } /** * Returns number of courses in the search results * * It is recommended to call this function after {@link coursecat::search_courses()} * and not before because only course ids are cached. Otherwise search_courses() may * perform extra DB queries. * * @param array $search search criteria, see method search_courses() for more details * @param array $options display options. They do not affect the result but * the 'sort' property is used in cache key for storing list of course ids * @return int */ public static function search_courses_count($search, $options = array()) { $coursecatcache = cache::make('core', 'coursecat'); $cntcachekey = 'scnt-'. serialize($search); if (($cnt = $coursecatcache->get($cntcachekey)) === false) { self::search_courses($search, $options); $cnt = $coursecatcache->get($cntcachekey); } return $cnt; } /** * Retrieves the list of courses accessible by user * * Not all information is cached, try to avoid calling this method * twice in the same request. * * The following fields are always retrieved: * - id, visible, fullname, shortname, idnumber, category, sortorder * * If you plan to use properties/methods course_in_list::$summary and/or * course_in_list::get_course_contacts() * you can preload this information using appropriate 'options'. Otherwise * they will be retrieved from DB on demand and it may end with bigger DB load. * * Note that method course_in_list::has_summary() will not perform additional * DB queries even if $options['summary'] is not specified * * List of found course ids is cached for 10 minutes. Cache may be purged prior * to this when somebody edits courses or categories, however it is very * difficult to keep track of all possible changes that may affect list of courses. * * @param array $options options for retrieving children * - recursive - return courses from subcategories as well. Use with care, * this may be a huge list! * - summary - preloads fields 'summary' and 'summaryformat' * - coursecontacts - preloads course contacts * - sort - list of fields to sort. Example * array('idnumber' => 1, 'shortname' => 1, 'id' => -1) * will sort by idnumber asc, shortname asc and id desc. * Default: array('sortorder' => 1) * Only cached fields may be used for sorting! * - offset * - limit - maximum number of children to return, 0 or null for no limit * @return array array of instances of course_in_list */ public function get_courses($options = array()) { global $DB; $recursive = !empty($options['recursive']); $offset = !empty($options['offset']) ? $options['offset'] : 0; $limit = !empty($options['limit']) ? $options['limit'] : null; $sortfields = !empty($options['sort']) ? $options['sort'] : array('sortorder' => 1); // Check if this category is hidden. // Also 0-category never has courses unless this is recursive call. if (!$this->is_uservisible() || (!$this->id && !$recursive)) { return array(); } $coursecatcache = cache::make('core', 'coursecat'); $cachekey = 'l-'. $this->id. '-'. (!empty($options['recursive']) ? 'r' : ''). '-'. serialize($sortfields); $cntcachekey = 'lcnt-'. $this->id. '-'. (!empty($options['recursive']) ? 'r' : ''); // check if we have already cached results $ids = $coursecatcache->get($cachekey); if ($ids !== false) { // we already cached last search result and it did not expire yet $ids = array_slice($ids, $offset, $limit); $courses = array(); if (!empty($ids)) { list($sql, $params) = $DB->get_in_or_equal($ids, SQL_PARAMS_NAMED, 'id'); $records = self::get_course_records("c.id ". $sql, $params, $options); foreach ($ids as $id) { $courses[$id] = new course_in_list($records[$id]); } } return $courses; } // retrieve list of courses in category $where = 'c.id <> :siteid'; $params = array('siteid' => SITEID); if ($recursive) { if ($this->id) { $context = context_coursecat::instance($this->id); $where .= ' AND ctx.path like :path'; $params['path'] = $context->path. '/%'; } } else { $where .= ' AND c.category = :categoryid'; $params['categoryid'] = $this->id; } // get list of courses without preloaded coursecontacts because we don't need them for every course $list = $this->get_course_records($where, $params, array_diff_key($options, array('coursecontacts' => 1)), true); // sort and cache list self::sort_records($list, $sortfields); $coursecatcache->set($cachekey, array_keys($list)); $coursecatcache->set($cntcachekey, count($list)); // Apply offset/limit, convert to course_in_list and return. $courses = array(); if (isset($list)) { if ($offset || $limit) { $list = array_slice($list, $offset, $limit, true); } // Preload course contacts if necessary - saves DB queries later to do it for each course separately. if (!empty($options['coursecontacts'])) { self::preload_course_contacts($list); } foreach ($list as $record) { $courses[$record->id] = new course_in_list($record); } } return $courses; } /** * Returns number of courses visible to the user * * @param array $options similar to get_courses() except some options do not affect * number of courses (i.e. sort, summary, offset, limit etc.) * @return int */ public function get_courses_count($options = array()) { $cntcachekey = 'lcnt-'. $this->id. '-'. (!empty($options['recursive']) ? 'r' : ''); $coursecatcache = cache::make('core', 'coursecat'); if (($cnt = $coursecatcache->get($cntcachekey)) === false) { $this->get_courses($options); $cnt = $coursecatcache->get($cntcachekey); } return $cnt; } /** * Returns true if user can delete current category and all its contents * * To be able to delete course category the user must have permission * 'moodle/category:manage' in ALL child course categories AND * be able to delete all courses * * @return bool */ public function can_delete_full() { global $DB; if (!$this->id) { // fool-proof return false; } $context = context_coursecat::instance($this->id); if (!$this->is_uservisible() || !has_capability('moodle/category:manage', $context)) { return false; } // Check all child categories (not only direct children) $sql = context_helper::get_preload_record_columns_sql('ctx'); $childcategories = $DB->get_records_sql('SELECT c.id, c.visible, '. $sql. ' FROM {context} ctx '. ' JOIN {course_categories} c ON c.id = ctx.instanceid'. ' WHERE ctx.path like ? AND ctx.contextlevel = ?', array($context->path. '/%', CONTEXT_COURSECAT)); foreach ($childcategories as $childcat) { context_helper::preload_from_record($childcat); $childcontext = context_coursecat::instance($childcat->id); if ((!$childcat->visible && !has_capability('moodle/category:viewhiddencategories', $childcontext)) || !has_capability('moodle/category:manage', $childcontext)) { return false; } } // Check courses $sql = context_helper::get_preload_record_columns_sql('ctx'); $coursescontexts = $DB->get_records_sql('SELECT ctx.instanceid AS courseid, '. $sql. ' FROM {context} ctx '. 'WHERE ctx.path like :pathmask and ctx.contextlevel = :courselevel', array('pathmask' => $context->path. '/%', 'courselevel' => CONTEXT_COURSE)); foreach ($coursescontexts as $ctxrecord) { context_helper::preload_from_record($ctxrecord); if (!can_delete_course($ctxrecord->courseid)) { return false; } } return true; } /** * Recursively delete category including all subcategories and courses * * Function {@link coursecat::can_delete_full()} MUST be called prior * to calling this function because there is no capability check * inside this function * * @param boolean $showfeedback display some notices * @return array return deleted courses */ public function delete_full($showfeedback = true) { global $CFG, $DB; require_once($CFG->libdir.'/gradelib.php'); require_once($CFG->libdir.'/questionlib.php'); require_once($CFG->dirroot.'/cohort/lib.php'); $deletedcourses = array(); // Get children. Note, we don't want to use cache here because // it would be rebuilt too often $children = $DB->get_records('course_categories', array('parent' => $this->id), 'sortorder ASC'); foreach ($children as $record) { $coursecat = new coursecat($record); $deletedcourses += $coursecat->delete_full($showfeedback); } if ($courses = $DB->get_records('course', array('category' => $this->id), 'sortorder ASC')) { foreach ($courses as $course) { if (!delete_course($course, false)) { throw new moodle_exception('cannotdeletecategorycourse', '', '', $course->shortname); } $deletedcourses[] = $course; } } // move or delete cohorts in this context cohort_delete_category($this); // now delete anything that may depend on course category context grade_course_category_delete($this->id, 0, $showfeedback); if (!question_delete_course_category($this, 0, $showfeedback)) { throw new moodle_exception('cannotdeletecategoryquestions', '', '', $this->get_formatted_name()); } // finally delete the category and it's context $DB->delete_records('course_categories', array('id' => $this->id)); delete_context(CONTEXT_COURSECAT, $this->id); add_to_log(SITEID, "category", "delete", "index.php", "$this->name (ID $this->id)"); cache_helper::purge_by_event('changesincoursecat'); events_trigger('course_category_deleted', $this); // If we deleted $CFG->defaultrequestcategory, make it point somewhere else. if ($this->id == $CFG->defaultrequestcategory) { set_config('defaultrequestcategory', $DB->get_field('course_categories', 'MIN(id)', array('parent' => 0))); } return $deletedcourses; } /** * Checks if user can delete this category and move content (courses, subcategories and questions) * to another category. If yes returns the array of possible target categories names * * If user can not manage this category or it is completely empty - empty array will be returned * * @return array */ public function move_content_targets_list() { global $CFG; require_once($CFG->libdir . '/questionlib.php'); $context = context_coursecat::instance($this->id); if (!$this->is_uservisible() || !has_capability('moodle/category:manage', $context)) { // User is not able to manage current category, he is not able to delete it. // No possible target categories. return array(); } $testcaps = array(); // If this category has courses in it, user must have 'course:create' capability in target category. if ($this->has_courses()) { $testcaps[] = 'moodle/course:create'; } // If this category has subcategories or questions, user must have 'category:manage' capability in target category. if ($this->has_children() || question_context_has_any_questions($context)) { $testcaps[] = 'moodle/category:manage'; } if (!empty($testcaps)) { // return list of categories excluding this one and it's children return self::make_categories_list($testcaps, $this->id); } // Category is completely empty, no need in target for contents. return array(); } /** * Checks if user has capability to move all category content to the new parent before * removing this category * * @param int $newcatid * @return bool */ public function can_move_content_to($newcatid) { global $CFG; require_once($CFG->libdir . '/questionlib.php'); $context = context_coursecat::instance($this->id); if (!$this->is_uservisible() || !has_capability('moodle/category:manage', $context)) { return false; } $testcaps = array(); // If this category has courses in it, user must have 'course:create' capability in target category. if ($this->has_courses()) { $testcaps[] = 'moodle/course:create'; } // If this category has subcategories or questions, user must have 'category:manage' capability in target category. if ($this->has_children() || question_context_has_any_questions($context)) { $testcaps[] = 'moodle/category:manage'; } if (!empty($testcaps)) { return has_all_capabilities($testcaps, context_coursecat::instance($newcatid)); } // there is no content but still return true return true; } /** * Deletes a category and moves all content (children, courses and questions) to the new parent * * Note that this function does not check capabilities, {@link coursecat::can_move_content_to()} * must be called prior * * @param int $newparentid * @param bool $showfeedback * @return bool */ public function delete_move($newparentid, $showfeedback = false) { global $CFG, $DB, $OUTPUT; require_once($CFG->libdir.'/gradelib.php'); require_once($CFG->libdir.'/questionlib.php'); require_once($CFG->dirroot.'/cohort/lib.php'); // get all objects and lists because later the caches will be reset so // we don't need to make extra queries $newparentcat = self::get($newparentid, MUST_EXIST, true); $catname = $this->get_formatted_name(); $children = $this->get_children(); $coursesids = $DB->get_fieldset_select('course', 'id', 'category = :category ORDER BY sortorder ASC', array('category' => $this->id)); $context = context_coursecat::instance($this->id); if ($children) { foreach ($children as $childcat) { $childcat->change_parent_raw($newparentcat); // Log action. add_to_log(SITEID, "category", "move", "editcategory.php?id=$childcat->id", $childcat->id); } fix_course_sortorder(); } if ($coursesids) { if (!move_courses($coursesids, $newparentid)) { if ($showfeedback) { echo $OUTPUT->notification("Error moving courses"); } return false; } if ($showfeedback) { echo $OUTPUT->notification(get_string('coursesmovedout', '', $catname), 'notifysuccess'); } } // move or delete cohorts in this context cohort_delete_category($this); // now delete anything that may depend on course category context grade_course_category_delete($this->id, $newparentid, $showfeedback); if (!question_delete_course_category($this, $newparentcat, $showfeedback)) { if ($showfeedback) { echo $OUTPUT->notification(get_string('errordeletingquestionsfromcategory', 'question', $catname), 'notifysuccess'); } return false; } // finally delete the category and it's context $DB->delete_records('course_categories', array('id' => $this->id)); $context->delete(); add_to_log(SITEID, "category", "delete", "index.php", "$this->name (ID $this->id)"); events_trigger('course_category_deleted', $this); cache_helper::purge_by_event('changesincoursecat'); if ($showfeedback) { echo $OUTPUT->notification(get_string('coursecategorydeleted', '', $catname), 'notifysuccess'); } // If we deleted $CFG->defaultrequestcategory, make it point somewhere else. if ($this->id == $CFG->defaultrequestcategory) { set_config('defaultrequestcategory', $DB->get_field('course_categories', 'MIN(id)', array('parent' => 0))); } return true; } /** * Checks if user can move current category to the new parent * * This checks if new parent category exists, user has manage cap there * and new parent is not a child of this category * * @param int|stdClass|coursecat $newparentcat * @return bool */ public function can_change_parent($newparentcat) { if (!has_capability('moodle/category:manage', context_coursecat::instance($this->id))) { return false; } if (is_object($newparentcat)) { $newparentcat = self::get($newparentcat->id, IGNORE_MISSING); } else { $newparentcat = self::get((int)$newparentcat, IGNORE_MISSING); } if (!$newparentcat) { return false; } if ($newparentcat->id == $this->id || in_array($this->id, $newparentcat->get_parents())) { // can not move to itself or it's own child return false; } if ($newparentcat->id) { return has_capability('moodle/category:manage', context_coursecat::instance($newparentcat->id)); } else { return has_capability('moodle/category:manage', context_system::instance()); } } /** * Moves the category under another parent category. All associated contexts are moved as well * * This is protected function, use change_parent() or update() from outside of this class * * @see coursecat::change_parent() * @see coursecat::update() * * @param coursecat $newparentcat */ protected function change_parent_raw(coursecat $newparentcat) { global $DB; $context = context_coursecat::instance($this->id); $hidecat = false; if (empty($newparentcat->id)) { $DB->set_field('course_categories', 'parent', 0, array('id' => $this->id)); $newparent = context_system::instance(); } else { if ($newparentcat->id == $this->id || in_array($this->id, $newparentcat->get_parents())) { // can not move to itself or it's own child throw new moodle_exception('cannotmovecategory'); } $DB->set_field('course_categories', 'parent', $newparentcat->id, array('id' => $this->id)); $newparent = context_coursecat::instance($newparentcat->id); if (!$newparentcat->visible and $this->visible) { // better hide category when moving into hidden category, teachers may unhide afterwards and the hidden children will be restored properly $hidecat = true; } } $this->parent = $newparentcat->id; $context->update_moved($newparent); // now make it last in new category $DB->set_field('course_categories', 'sortorder', MAX_COURSES_IN_CATEGORY*MAX_COURSE_CATEGORIES, array('id' => $this->id)); if ($hidecat) { fix_course_sortorder(); $this->restore(); // Hide object but store 1 in visibleold, because when parent category visibility changes this category must become visible again. $this->hide_raw(1); } } /** * Efficiently moves a category - NOTE that this can have * a huge impact access-control-wise... * * Note that this function does not check capabilities. * * Example of usage: * $coursecat = coursecat::get($categoryid); * if ($coursecat->can_change_parent($newparentcatid)) { * $coursecat->change_parent($newparentcatid); * } * * This function does not update field course_categories.timemodified * If you want to update timemodified, use * $coursecat->update(array('parent' => $newparentcat)); * * @param int|stdClass|coursecat $newparentcat */ public function change_parent($newparentcat) { // Make sure parent category exists but do not check capabilities here that it is visible to current user. if (is_object($newparentcat)) { $newparentcat = self::get($newparentcat->id, MUST_EXIST, true); } else { $newparentcat = self::get((int)$newparentcat, MUST_EXIST, true); } if ($newparentcat->id != $this->parent) { $this->change_parent_raw($newparentcat); fix_course_sortorder(); cache_helper::purge_by_event('changesincoursecat'); $this->restore(); add_to_log(SITEID, "category", "move", "editcategory.php?id=$this->id", $this->id); } } /** * Hide course category and child course and subcategories * * If this category has changed the parent and is moved under hidden * category we will want to store it's current visibility state in * the field 'visibleold'. If admin clicked 'hide' for this particular * category, the field 'visibleold' should become 0. * * All subcategories and courses will have their current visibility in the field visibleold * * This is protected function, use hide() or update() from outside of this class * * @see coursecat::hide() * @see coursecat::update() * * @param int $visibleold value to set in field $visibleold for this category * @return bool whether changes have been made and caches need to be purged afterwards */ protected function hide_raw($visibleold = 0) { global $DB; $changes = false; // Note that field 'visibleold' is not cached so we must retrieve it from DB if it is missing if ($this->id && $this->__get('visibleold') != $visibleold) { $this->visibleold = $visibleold; $DB->set_field('course_categories', 'visibleold', $visibleold, array('id' => $this->id)); $changes = true; } if (!$this->visible || !$this->id) { // already hidden or can not be hidden return $changes; } $this->visible = 0; $DB->set_field('course_categories', 'visible', 0, array('id'=>$this->id)); $DB->execute("UPDATE {course} SET visibleold = visible WHERE category = ?", array($this->id)); // store visible flag so that we can return to it if we immediately unhide $DB->set_field('course', 'visible', 0, array('category' => $this->id)); // get all child categories and hide too if ($subcats = $DB->get_records_select('course_categories', "path LIKE ?", array("$this->path/%"), 'id, visible')) { foreach ($subcats as $cat) { $DB->set_field('course_categories', 'visibleold', $cat->visible, array('id' => $cat->id)); $DB->set_field('course_categories', 'visible', 0, array('id' => $cat->id)); $DB->execute("UPDATE {course} SET visibleold = visible WHERE category = ?", array($cat->id)); $DB->set_field('course', 'visible', 0, array('category' => $cat->id)); } } return true; } /** * Hide course category and child course and subcategories * * Note that there is no capability check inside this function * * This function does not update field course_categories.timemodified * If you want to update timemodified, use * $coursecat->update(array('visible' => 0)); */ public function hide() { if ($this->hide_raw(0)) { cache_helper::purge_by_event('changesincoursecat'); add_to_log(SITEID, "category", "hide", "editcategory.php?id=$this->id", $this->id); } } /** * Show course category and restores visibility for child course and subcategories * * Note that there is no capability check inside this function * * This is protected function, use show() or update() from outside of this class * * @see coursecat::show() * @see coursecat::update() * * @return bool whether changes have been made and caches need to be purged afterwards */ protected function show_raw() { global $DB; if ($this->visible) { // already visible return false; } $this->visible = 1; $this->visibleold = 1; $DB->set_field('course_categories', 'visible', 1, array('id' => $this->id)); $DB->set_field('course_categories', 'visibleold', 1, array('id' => $this->id)); $DB->execute("UPDATE {course} SET visible = visibleold WHERE category = ?", array($this->id)); // get all child categories and unhide too if ($subcats = $DB->get_records_select('course_categories', "path LIKE ?", array("$this->path/%"), 'id, visibleold')) { foreach ($subcats as $cat) { if ($cat->visibleold) { $DB->set_field('course_categories', 'visible', 1, array('id' => $cat->id)); } $DB->execute("UPDATE {course} SET visible = visibleold WHERE category = ?", array($cat->id)); } } return true; } /** * Show course category and restores visibility for child course and subcategories * * Note that there is no capability check inside this function * * This function does not update field course_categories.timemodified * If you want to update timemodified, use * $coursecat->update(array('visible' => 1)); */ public function show() { if ($this->show_raw()) { cache_helper::purge_by_event('changesincoursecat'); add_to_log(SITEID, "category", "show", "editcategory.php?id=$this->id", $this->id); } } /** * Returns name of the category formatted as a string * * @param array $options formatting options other than context * @return string */ public function get_formatted_name($options = array()) { if ($this->id) { $context = context_coursecat::instance($this->id); return format_string($this->name, true, array('context' => $context) + $options); } else { return ''; // TODO 'Top'? } } /** * Returns ids of all parents of the category. Last element in the return array is the direct parent * * For example, if you have a tree of categories like: * Miscellaneous (id = 1) * Subcategory (id = 2) * Sub-subcategory (id = 4) * Other category (id = 3) * * coursecat::get(1)->get_parents() == array() * coursecat::get(2)->get_parents() == array(1) * coursecat::get(4)->get_parents() == array(1, 2); * * Note that this method does not check if all parents are accessible by current user * * @return array of category ids */ public function get_parents() { $parents = preg_split('|/|', $this->path, 0, PREG_SPLIT_NO_EMPTY); array_pop($parents); return $parents; } /** * This function returns a nice list representing category tree * for display or to use in a form element * * List is cached for 10 minutes * * For example, if you have a tree of categories like: * Miscellaneous (id = 1) * Subcategory (id = 2) * Sub-subcategory (id = 4) * Other category (id = 3) * Then after calling this function you will have * array(1 => 'Miscellaneous', * 2 => 'Miscellaneous / Subcategory', * 4 => 'Miscellaneous / Subcategory / Sub-subcategory', * 3 => 'Other category'); * * If you specify $requiredcapability, then only categories where the current * user has that capability will be added to $list. * If you only have $requiredcapability in a child category, not the parent, * then the child catgegory will still be included. * * If you specify the option $excludeid, then that category, and all its children, * are omitted from the tree. This is useful when you are doing something like * moving categories, where you do not want to allow people to move a category * to be the child of itself. * * See also {@link make_categories_options()} * * @param string/array $requiredcapability if given, only categories where the current * user has this capability will be returned. Can also be an array of capabilities, * in which case they are all required. * @param integer $excludeid Exclude this category and its children from the lists built. * @param string $separator string to use as a separator between parent and child category. Default ' / ' * @return array of strings */ public static function make_categories_list($requiredcapability = '', $excludeid = 0, $separator = ' / ') { global $DB; $coursecatcache = cache::make('core', 'coursecat'); // Check if we cached the complete list of user-accessible category names ($baselist) or list of ids with requried cap ($thislist). $basecachekey = 'catlist'; $baselist = $coursecatcache->get($basecachekey); $thislist = false; if (!empty($requiredcapability)) { $requiredcapability = (array)$requiredcapability; $thiscachekey = 'catlist:'. serialize($requiredcapability); if ($baselist !== false && ($thislist = $coursecatcache->get($thiscachekey)) !== false) { $thislist = preg_split('|,|', $thislist, -1, PREG_SPLIT_NO_EMPTY); } } else if ($baselist !== false) { $thislist = array_keys($baselist); } if ($baselist === false) { // We don't have $baselist cached, retrieve it. Retrieve $thislist again in any case. $ctxselect = context_helper::get_preload_record_columns_sql('ctx'); $sql = "SELECT cc.id, cc.sortorder, cc.name, cc.visible, cc.parent, cc.path, $ctxselect FROM {course_categories} cc JOIN {context} ctx ON cc.id = ctx.instanceid AND ctx.contextlevel = :contextcoursecat ORDER BY cc.sortorder"; $rs = $DB->get_recordset_sql($sql, array('contextcoursecat' => CONTEXT_COURSECAT)); $baselist = array(); $thislist = array(); foreach ($rs as $record) { // If the category's parent is not visible to the user, it is not visible as well. if (!$record->parent || isset($baselist[$record->parent])) { $context = context_coursecat::instance($record->id); if (!$record->visible && !has_capability('moodle/category:viewhiddencategories', $context)) { // No cap to view category, added to neither $baselist nor $thislist continue; } $baselist[$record->id] = array( 'name' => format_string($record->name, true, array('context' => $context)), 'path' => $record->path ); if (!empty($requiredcapability) && !has_all_capabilities($requiredcapability, $context)) { // No required capability, added to $baselist but not to $thislist. continue; } $thislist[] = $record->id; } } $rs->close(); $coursecatcache->set($basecachekey, $baselist); if (!empty($requiredcapability)) { $coursecatcache->set($thiscachekey, join(',', $thislist)); } } else if ($thislist === false) { // We have $baselist cached but not $thislist. Simplier query is used to retrieve. $ctxselect = context_helper::get_preload_record_columns_sql('ctx'); $sql = "SELECT ctx.instanceid id, $ctxselect FROM {context} ctx WHERE ctx.contextlevel = :contextcoursecat"; $contexts = $DB->get_records_sql($sql, array('contextcoursecat' => CONTEXT_COURSECAT)); $thislist = array(); foreach (array_keys($baselist) as $id) { context_helper::preload_from_record($contexts[$id]); if (has_all_capabilities($requiredcapability, context_coursecat::instance($id))) { $thislist[] = $id; } } $coursecatcache->set($thiscachekey, join(',', $thislist)); } // Now build the array of strings to return, mind $separator and $excludeid. $names = array(); foreach ($thislist as $id) { $path = preg_split('|/|', $baselist[$id]['path'], -1, PREG_SPLIT_NO_EMPTY); if (!$excludeid || !in_array($excludeid, $path)) { $namechunks = array(); foreach ($path as $parentid) { $namechunks[] = $baselist[$parentid]['name']; } $names[$id] = join($separator, $namechunks); } } return $names; } /** * Prepares the object for caching. Works like the __sleep method. * * implementing method from interface cacheable_object * * @return array ready to be cached */ public function prepare_to_cache() { $a = array(); foreach (self::$coursecatfields as $property => $cachedirectives) { if ($cachedirectives !== null) { list($shortname, $defaultvalue) = $cachedirectives; if ($this->$property !== $defaultvalue) { $a[$shortname] = $this->$property; } } } $context = context_coursecat::instance($this->id); $a['xi'] = $context->id; $a['xp'] = $context->path; return $a; } /** * Takes the data provided by prepare_to_cache and reinitialises an instance of the associated from it. * * implementing method from interface cacheable_object * * @param array $a * @return coursecat */ public static function wake_from_cache($a) { $record = new stdClass; foreach (self::$coursecatfields as $property => $cachedirectives) { if ($cachedirectives !== null) { list($shortname, $defaultvalue) = $cachedirectives; if (array_key_exists($shortname, $a)) { $record->$property = $a[$shortname]; } else { $record->$property = $defaultvalue; } } } $record->ctxid = $a['xi']; $record->ctxpath = $a['xp']; $record->ctxdepth = $record->depth + 1; $record->ctxlevel = CONTEXT_COURSECAT; $record->ctxinstance = $record->id; return new coursecat($record, true); } } /** * Class to store information about one course in a list of courses * * Not all information may be retrieved when object is created but * it will be retrieved on demand when appropriate property or method is * called. * * Instances of this class are usually returned by functions * {@link coursecat::search_courses()} * and * {@link coursecat::get_courses()} * * @package core * @subpackage course * @copyright 2013 Marina Glancy * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class course_in_list implements IteratorAggregate { /** @var stdClass record retrieved from DB, may have additional calculated property such as managers and hassummary */ protected $record; /** @var array array of course contacts - stores result of call to get_course_contacts() */ protected $coursecontacts; /** * Creates an instance of the class from record * * @param stdClass $record except fields from course table it may contain * field hassummary indicating that summary field is not empty. * Also it is recommended to have context fields here ready for * context preloading */ public function __construct(stdClass $record) { context_instance_preload($record); $this->record = new stdClass(); foreach ($record as $key => $value) { $this->record->$key = $value; } } /** * Indicates if the course has non-empty summary field * * @return bool */ public function has_summary() { if (isset($this->record->hassummary)) { return !empty($this->record->hassummary); } if (!isset($this->record->summary)) { // we need to retrieve summary $this->__get('summary'); } return !empty($this->record->summary); } /** * Indicates if the course have course contacts to display * * @return bool */ public function has_course_contacts() { if (!isset($this->record->managers)) { $courses = array($this->id => &$this->record); coursecat::preload_course_contacts($courses); } return !empty($this->record->managers); } /** * Returns list of course contacts (usually teachers) to display in course link * * Roles to display are set up in $CFG->coursecontact * * The result is the list of users where user id is the key and the value * is an array with elements: * - 'user' - object containing basic user information * - 'role' - object containing basic role information (id, name, shortname, coursealias) * - 'rolename' => role_get_name($role, $context, ROLENAME_ALIAS) * - 'username' => fullname($user, $canviewfullnames) * * @return array */ public function get_course_contacts() { global $CFG; if (empty($CFG->coursecontact)) { // no roles are configured to be displayed as course contacts return array(); } if ($this->coursecontacts === null) { $this->coursecontacts = array(); $context = context_course::instance($this->id); if (!isset($this->record->managers)) { // preload course contacts from DB $courses = array($this->id => &$this->record); coursecat::preload_course_contacts($courses); } // build return array with full roles names (for this course context) and users names $canviewfullnames = has_capability('moodle/site:viewfullnames', $context); foreach ($this->record->managers as $ruser) { if (isset($this->coursecontacts[$ruser->id])) { // only display a user once with the highest sortorder role continue; } $user = new stdClass(); $user->id = $ruser->id; $user->username = $ruser->username; $user->firstname = $ruser->firstname; $user->lastname = $ruser->lastname; $role = new stdClass(); $role->id = $ruser->roleid; $role->name = $ruser->rolename; $role->shortname = $ruser->roleshortname; $role->coursealias = $ruser->rolecoursealias; $this->coursecontacts[$user->id] = array( 'user' => $user, 'role' => $role, 'rolename' => role_get_name($role, $context, ROLENAME_ALIAS), 'username' => fullname($user, $canviewfullnames) ); } } return $this->coursecontacts; } /** * Checks if course has any associated overview files * * @return bool */ public function has_course_overviewfiles() { global $CFG; if (empty($CFG->courseoverviewfileslimit)) { return 0; } require_once($CFG->libdir. '/filestorage/file_storage.php'); $fs = get_file_storage(); $context = context_course::instance($this->id); return $fs->is_area_empty($context->id, 'course', 'overviewfiles'); } /** * Returns all course overview files * * @return array array of stored_file objects */ public function get_course_overviewfiles() { global $CFG; if (empty($CFG->courseoverviewfileslimit)) { return array(); } require_once($CFG->libdir. '/filestorage/file_storage.php'); require_once($CFG->dirroot. '/course/lib.php'); $fs = get_file_storage(); $context = context_course::instance($this->id); $files = $fs->get_area_files($context->id, 'course', 'overviewfiles', false, 'filename', false); if (count($files)) { $overviewfilesoptions = course_overviewfiles_options($this->id); $acceptedtypes = $overviewfilesoptions['accepted_types']; if ($acceptedtypes !== '*') { // filter only files with allowed extensions require_once($CFG->libdir. '/filelib.php'); foreach ($files as $key => $file) { if (!file_extension_in_typegroup($file->get_filename(), $acceptedtypes)) { unset($files[$key]); } } } if (count($files) > $CFG->courseoverviewfileslimit) { // return no more than $CFG->courseoverviewfileslimit files $files = array_slice($files, 0, $CFG->courseoverviewfileslimit, true); } } return $files; } // ====== magic methods ======= public function __isset($name) { return isset($this->record->$name); } /** * Magic method to get a course property * * Returns any field from table course (from cache or from DB) and/or special field 'hassummary' * * @param string $name * @return mixed */ public function __get($name) { global $DB; if (property_exists($this->record, $name)) { return $this->record->$name; } else if ($name === 'summary' || $name === 'summaryformat') { // retrieve fields summary and summaryformat together because they are most likely to be used together $record = $DB->get_record('course', array('id' => $this->record->id), 'summary, summaryformat', MUST_EXIST); $this->record->summary = $record->summary; $this->record->summaryformat = $record->summaryformat; return $this->record->$name; } else if (array_key_exists($name, $DB->get_columns('course'))) { // another field from table 'course' that was not retrieved $this->record->$name = $DB->get_field('course', $name, array('id' => $this->record->id), MUST_EXIST); return $this->record->$name; } debugging('Invalid course property accessed! '.$name); return null; } /** * ALl properties are read only, sorry. * @param string $name */ public function __unset($name) { debugging('Can not unset '.get_class($this).' instance properties!'); } /** * Magic setter method, we do not want anybody to modify properties from the outside * @param string $name * @param mixed $value */ public function __set($name, $value) { debugging('Can not change '.get_class($this).' instance properties!'); } // ====== implementing method from interface IteratorAggregate ====== /** * Create an iterator because magic vars can't be seen by 'foreach'. * Exclude context fields */ public function getIterator() { $ret = array('id' => $this->record->id); foreach ($this->record as $property => $value) { $ret[$property] = $value; } return new ArrayIterator($ret); } } /** * An array of records that is sortable by many fields. * * For more info on the ArrayObject class have a look at php.net. * * @package core * @subpackage course * @copyright 2013 Sam Hemelryk * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class coursecat_sortable_records extends ArrayObject { /** * An array of sortable fields. * Gets set temporarily when sort is called. * @var array */ protected $sortfields = array(); /** * Sorts this array using the given fields. * * @param array $records * @param array $fields * @return array */ public static function sort(array $records, array $fields) { $records = new coursecat_sortable_records($records); $records->sortfields = $fields; $records->uasort(array($records, 'sort_by_many_fields')); return $records->getArrayCopy(); } /** * Sorts the two records based upon many fields. * * This method should not be called itself, please call $sort instead. * It has been marked as access private as such. * * @access private * @param stdClass $a * @param stdClass $b * @return int */ public function sort_by_many_fields($a, $b) { foreach ($this->sortfields as $field => $mult) { // nulls first if (is_null($a->$field) && !is_null($b->$field)) { return -$mult; } if (is_null($b->$field) && !is_null($a->$field)) { return $mult; } if (is_string($a->$field) || is_string($b->$field)) { // string fields if ($cmp = strcoll($a->$field, $b->$field)) { return $mult * $cmp; } } else { // int fields if ($a->$field > $b->$field) { return $mult; } if ($a->$field < $b->$field) { return -$mult; } } } return 0; } }