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completionlib.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 a class used for tracking whether activities have been completed
* by students ('completion')
*
* Completion top-level options (admin setting enablecompletion)
*
* @package core
* @subpackage completion
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once $CFG->libdir.'/completion/completion_aggregation.php';
require_once $CFG->libdir.'/completion/completion_criteria.php';
require_once $CFG->libdir.'/completion/completion_completion.php';
require_once $CFG->libdir.'/completion/completion_criteria_completion.php';
/** The completion system is enabled in this site/course */
define('COMPLETION_ENABLED', 1);
/** The completion system is not enabled in this site/course */
define('COMPLETION_DISABLED', 0);
// Completion tracking options per-activity (course_modules/completion)
/** Completion tracking is disabled for this activity */
define('COMPLETION_TRACKING_NONE', 0);
/** Manual completion tracking (user ticks box) is enabled for this activity */
define('COMPLETION_TRACKING_MANUAL', 1);
/** Automatic completion tracking (system ticks box) is enabled for this activity */
define('COMPLETION_TRACKING_AUTOMATIC', 2);
// Completion state values (course_modules_completion/completionstate)
/** The user has not completed this activity. */
define('COMPLETION_INCOMPLETE', 0);
/** The user has completed this activity. It is not specified whether they have
* passed or failed it. */
define('COMPLETION_COMPLETE', 1);
/** The user has completed this activity with a grade above the pass mark. */
define('COMPLETION_COMPLETE_PASS', 2);
/** The user has completed this activity but their grade is less than the pass mark */
define('COMPLETION_COMPLETE_FAIL', 3);
// Completion effect changes (used only in update_state)
/** The effect of this change to completion status is unknown. */
define('COMPLETION_UNKNOWN', -1);
/** The user's grade has changed, so their new state might be
* COMPLETION_COMPLETE_PASS or COMPLETION_COMPLETE_FAIL. */
// TODO Is this useful?
define('COMPLETION_GRADECHANGE', -2);
// Whether view is required to create an activity (course_modules/completionview)
/** User must view this activity */
define('COMPLETION_VIEW_REQUIRED', 1);
/** User does not need to view this activity */
define('COMPLETION_VIEW_NOT_REQUIRED', 0);
// Completion viewed state (course_modules_completion/viewed)
/** User has viewed this activity */
define('COMPLETION_VIEWED', 1);
/** User has not viewed this activity */
define('COMPLETION_NOT_VIEWED', 0);
// Completion cacheing
/** Cache expiry time in seconds (10 minutes) */
define('COMPLETION_CACHE_EXPIRY', 10*60);
// Combining completion condition. This is also the value you should return
// if you don't have any applicable conditions. Used for activity completion.
/** Completion details should be ORed together and you should return false if
none apply */
define('COMPLETION_OR', false);
/** Completion details should be ANDed together and you should return true if
none apply */
define('COMPLETION_AND', true);
// Course completion criteria aggregation methods
define('COMPLETION_AGGREGATION_ALL', 1);
define('COMPLETION_AGGREGATION_ANY', 2);
/**
* Class represents completion information for a course.
*
* Does not contain any data, so you can safely construct it multiple times
* without causing any problems.
*
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @package moodlecore
*/
class completion_info {
/**
* Course object passed during construction
* @access private
* @var object
*/
private $course;
/**
* Course id
* @access public
* @var int
*/
public $course_id;
/**
* Completion criteria
* @access private
* @var array
* @see completion_info->get_criteria()
*/
private $criteria;
/**
* Return array of aggregation methods
* @access public
* @return array
*/
public static function get_aggregation_methods() {
return array(
COMPLETION_AGGREGATION_ALL => get_string('all'),
COMPLETION_AGGREGATION_ANY => get_string('any', 'completion'),
);
}
/**
* Constructs with course details.
*
* @param object $course Moodle course object. Must have at least ->id, ->enablecompletion
*/
public function __construct($course) {
$this->course = $course;
$this->course_id = $course->id;
}
/**
* Determines whether completion is enabled across entire site.
*
* Static function.
*
* @global object
* @return int COMPLETION_ENABLED (true) if completion is enabled for the site,
* COMPLETION_DISABLED (false) if it's complete
*/
public static function is_enabled_for_site() {
global $CFG;
return !empty($CFG->enablecompletion);
}
/**
* Checks whether completion is enabled in a particular course and possibly
* activity.
*
* @global object
* @uses COMPLETION_DISABLED
* @uses COMPLETION_ENABLED
* @param object $cm Course-module object. If not specified, returns the course
* completion enable state.
* @return mixed COMPLETION_ENABLED or COMPLETION_DISABLED (==0) in the case of
* site and course; COMPLETION_TRACKING_MANUAL, _AUTOMATIC or _NONE (==0)
* for a course-module.
*/
public function is_enabled($cm=null) {
global $CFG;
// First check global completion
if (!isset($CFG->enablecompletion) || $CFG->enablecompletion == COMPLETION_DISABLED) {
return COMPLETION_DISABLED;
}
// Check course completion
if ($this->course->enablecompletion == COMPLETION_DISABLED) {
return COMPLETION_DISABLED;
}
// If there was no $cm and we got this far, then it's enabled
if (!$cm) {
return COMPLETION_ENABLED;
}
// Return course-module completion value
return $cm->completion;
}
/**
* Displays the 'Your progress' help icon, if completion tracking is enabled.
* Just prints the result of display_help_icon().
* @deprecated Use display_help_icon instead.
* @return void
*/
public function print_help_icon() {
print $this->display_help_icon();
}
/**
* Returns the 'Your progress' help icon, if completion tracking is enabled.
* @global object
* @return string HTML code for help icon, or blank if not needed
*/
public function display_help_icon() {
global $PAGE, $OUTPUT;
$result = '';
if ($this->is_enabled() && !$PAGE->user_is_editing() && isloggedin() && !isguestuser()) {
$result .= '<span id = "completionprogressid" class="completionprogress">'.get_string('yourprogress','completion').' ';
$result .= $OUTPUT->help_icon('completionicons', 'completion');
$result .= '</span>';
}
return $result;
}
/**
* Get a course completion for a user
* @access public
* @param $user_id int User id
* @param $criteriatype int Specific criteria type to return
* @return false|completion_criteria_completion
*/
public function get_completion($user_id, $criteriatype) {
$completions = $this->get_completions($user_id, $criteriatype);
if (empty($completions)) {
return false;
} elseif (count($completions) > 1) {
print_error('multipleselfcompletioncriteria', 'completion');
}
return $completions[0];
}
/**
* Get all course criteria's completion objects for a user
* @access public
* @param $user_id int User id
* @param $criteriatype int optional Specific criteria type to return
* @return array
*/
public function get_completions($user_id, $criteriatype = null) {
$criterion = $this->get_criteria($criteriatype);
$completions = array();
foreach ($criterion as $criteria) {
$params = array(
'course' => $this->course_id,
'userid' => $user_id,
'criteriaid' => $criteria->id
);
$completion = new completion_criteria_completion($params);
$completion->attach_criteria($criteria);
$completions[] = $completion;
}
return $completions;
}
/**
* Get completion object for a user and a criteria
* @access public
* @param $user_id int User id
* @param $criteria completion_criteria Criteria object
* @return completion_criteria_completion
*/
public function get_user_completion($user_id, $criteria) {
$params = array(
'criteriaid' => $criteria->id,
'userid' => $user_id
);
$completion = new completion_criteria_completion($params);
return $completion;
}
/**
* Check if course has completion criteria set
*
* @access public
* @return bool
*/
public function has_criteria() {
$criteria = $this->get_criteria();
return (bool) count($criteria);
}
/**
* Get course completion criteria
* @access public
* @param $criteriatype int optional Specific criteria type to return
* @return void
*/
public function get_criteria($criteriatype = null) {
// Fill cache if empty
if (!is_array($this->criteria)) {
global $DB;
$params = array(
'course' => $this->course->id
);
// Load criteria from database
$records = (array)$DB->get_records('course_completion_criteria', $params);
// Build array of criteria objects
$this->criteria = array();
foreach ($records as $record) {
$this->criteria[$record->id] = completion_criteria::factory($record);
}
}
// If after all criteria
if ($criteriatype === null) {
return $this->criteria;
}
// If we are only after a specific criteria type
$criteria = array();
foreach ($this->criteria as $criterion) {
if ($criterion->criteriatype != $criteriatype) {
continue;
}
$criteria[$criterion->id] = $criterion;
}
return $criteria;
}
/**
* Get aggregation method
* @access public
* @param $criteriatype int optional If none supplied, get overall aggregation method
* @return int
*/
public function get_aggregation_method($criteriatype = null) {
$params = array(
'course' => $this->course_id,
'criteriatype' => $criteriatype
);
$aggregation = new completion_aggregation($params);
if (!$aggregation->id) {
$aggregation->method = COMPLETION_AGGREGATION_ALL;
}
return $aggregation->method;
}
/**
* Get incomplete course completion criteria
* @access public
* @return void
*/
public function get_incomplete_criteria() {
$incomplete = array();
foreach ($this->get_criteria() as $criteria) {
if (!$criteria->is_complete()) {
$incomplete[] = $criteria;
}
}
return $incomplete;
}
/**
* Clear old course completion criteria
*/
public function clear_criteria() {
global $DB;
$DB->delete_records('course_completion_criteria', array('course' => $this->course_id));
$DB->delete_records('course_completion_aggr_methd', array('course' => $this->course_id));
$this->delete_course_completion_data();
}
/**
* Has the supplied user completed this course
* @access public
* @param $user_id int User's id
* @return boolean
*/
public function is_course_complete($user_id) {
$params = array(
'userid' => $user_id,
'course' => $this->course_id
);
$ccompletion = new completion_completion($params);
return $ccompletion->is_complete();
}
/**
* Updates (if necessary) the completion state of activity $cm for the given
* user.
*
* For manual completion, this function is called when completion is toggled
* with $possibleresult set to the target state.
*
* For automatic completion, this function should be called every time a module
* does something which might influence a user's completion state. For example,
* if a forum provides options for marking itself 'completed' once a user makes
* N posts, this function should be called every time a user makes a new post.
* [After the post has been saved to the database]. When calling, you do not
* need to pass in the new completion state. Instead this function carries out
* completion calculation by checking grades and viewed state itself, and
* calling the involved module via modulename_get_completion_state() to check
* module-specific conditions.
*
* @global object
* @global object
* @uses COMPLETION_COMPLETE
* @uses COMPLETION_INCOMPLETE
* @uses COMPLETION_COMPLETE_PASS
* @uses COMPLETION_COMPLETE_FAIL
* @uses COMPLETION_TRACKING_MANUAL
* @param object $cm Course-module
* @param int $possibleresult Expected completion result. If the event that
* has just occurred (e.g. add post) can only result in making the activity
* complete when it wasn't before, use COMPLETION_COMPLETE. If the event that
* has just occurred (e.g. delete post) can only result in making the activity
* not complete when it was previously complete, use COMPLETION_INCOMPLETE.
* Otherwise use COMPLETION_UNKNOWN. Setting this value to something other than
* COMPLETION_UNKNOWN significantly improves performance because it will abandon
* processing early if the user's completion state already matches the expected
* result. For manual events, COMPLETION_COMPLETE or COMPLETION_INCOMPLETE
* must be used; these directly set the specified state.
* @param int $userid User ID to be updated. Default 0 = current user
* @return void
*/
public function update_state($cm, $possibleresult=COMPLETION_UNKNOWN, $userid=0) {
global $USER, $SESSION;
// Do nothing if completion is not enabled for that activity
if (!$this->is_enabled($cm)) {
return;
}
// Get current value of completion state and do nothing if it's same as
// the possible result of this change. If the change is to COMPLETE and the
// current value is one of the COMPLETE_xx subtypes, ignore that as well
$current = $this->get_data($cm, false, $userid);
if ($possibleresult == $current->completionstate ||
($possibleresult == COMPLETION_COMPLETE &&
($current->completionstate == COMPLETION_COMPLETE_PASS ||
$current->completionstate == COMPLETION_COMPLETE_FAIL))) {
return;
}
if ($cm->completion == COMPLETION_TRACKING_MANUAL) {
// For manual tracking we set the result directly
switch($possibleresult) {
case COMPLETION_COMPLETE:
case COMPLETION_INCOMPLETE:
$newstate = $possibleresult;
break;
default:
$this->internal_systemerror("Unexpected manual completion state for {$cm->id}: $possibleresult");
}
} else {
// Automatic tracking; get new state
$newstate = $this->internal_get_state($cm, $userid, $current);
}
// If changed, update
if ($newstate != $current->completionstate) {
$current->completionstate = $newstate;
$current->timemodified = time();
$this->internal_set_data($cm, $current);
}
}
/**
* Calculates the completion state for an activity and user.
*
* Internal function. Not private, so we can unit-test it.
*
* @global object
* @global object
* @global object
* @uses COMPLETION_VIEW_REQUIRED
* @uses COMPLETION_NOT_VIEWED
* @uses COMPLETION_INCOMPLETE
* @uses FEATURE_COMPLETION_HAS_RULES
* @uses COMPLETION_COMPLETE
* @uses COMPLETION_AND
* @param object $cm Activity
* @param int $userid ID of user
* @param object $current Previous completion information from database
* @return mixed
*/
function internal_get_state($cm, $userid, $current) {
global $USER, $DB, $CFG;
// Get user ID
if (!$userid) {
$userid = $USER->id;
}
// Check viewed
if ($cm->completionview == COMPLETION_VIEW_REQUIRED &&
$current->viewed == COMPLETION_NOT_VIEWED) {
return COMPLETION_INCOMPLETE;
}
// Modname hopefully is provided in $cm but just in case it isn't, let's grab it
if (!isset($cm->modname)) {
$cm->modname = $DB->get_field('modules', 'name', array('id'=>$cm->module));
}
$newstate = COMPLETION_COMPLETE;
// Check grade
if (!is_null($cm->completiongradeitemnumber)) {
require_once($CFG->libdir.'/gradelib.php');
$item = grade_item::fetch(array('courseid'=>$cm->course, 'itemtype'=>'mod',
'itemmodule'=>$cm->modname, 'iteminstance'=>$cm->instance,
'itemnumber'=>$cm->completiongradeitemnumber));
if ($item) {
// Fetch 'grades' (will be one or none)
$grades = grade_grade::fetch_users_grades($item, array($userid), false);
if (empty($grades)) {
// No grade for user
return COMPLETION_INCOMPLETE;
}
if (count($grades) > 1) {
$this->internal_systemerror("Unexpected result: multiple grades for
item '{$item->id}', user '{$userid}'");
}
$newstate = $this->internal_get_grade_state($item, reset($grades));
if ($newstate == COMPLETION_INCOMPLETE) {
return COMPLETION_INCOMPLETE;
}
} else {
$this->internal_systemerror("Cannot find grade item for '{$cm->modname}'
cm '{$cm->id}' matching number '{$cm->completiongradeitemnumber}'");
}
}
if (plugin_supports('mod', $cm->modname, FEATURE_COMPLETION_HAS_RULES)) {
$function = $cm->modname.'_get_completion_state';
if (!function_exists($function)) {
$this->internal_systemerror("Module {$cm->modname} claims to support
FEATURE_COMPLETION_HAS_RULES but does not have required
{$cm->modname}_get_completion_state function");
}
if (!$function($this->course, $cm, $userid, COMPLETION_AND)) {
return COMPLETION_INCOMPLETE;
}
}
return $newstate;
}
/**
* Marks a module as viewed.
*
* Should be called whenever a module is 'viewed' (it is up to the module how to
* determine that). Has no effect if viewing is not set as a completion condition.
*
* Note that this function must be called before you print the page header because
* it is possible that the navigation block may depend on it. If you call it after
* printing the header, it shows a developer debug warning.
* @uses COMPLETION_VIEW_NOT_REQUIRED
* @uses COMPLETION_VIEWED
* @uses COMPLETION_COMPLETE
* @param object $cm Activity
* @param int $userid User ID or 0 (default) for current user
* @return void
*/
public function set_module_viewed($cm, $userid=0) {
global $PAGE;
if ($PAGE->headerprinted) {
debugging('set_module_viewed must be called before header is printed',
DEBUG_DEVELOPER);
}
// Don't do anything if view condition is not turned on
if ($cm->completionview == COMPLETION_VIEW_NOT_REQUIRED || !$this->is_enabled($cm)) {
return;
}
// Get current completion state
$data = $this->get_data($cm, $userid);
// If we already viewed it, don't do anything
if ($data->viewed == COMPLETION_VIEWED) {
return;
}
// OK, change state, save it, and update completion
$data->viewed = COMPLETION_VIEWED;
$this->internal_set_data($cm, $data);
$this->update_state($cm, COMPLETION_COMPLETE, $userid);
}
/**
* Determines how much completion data exists for an activity. This is used when
* deciding whether completion information should be 'locked' in the module
* editing form.
*
* @global object
* @param object $cm Activity
* @return int The number of users who have completion data stored for this
* activity, 0 if none
*/
public function count_user_data($cm) {
global $DB;
return $DB->get_field_sql("
SELECT
COUNT(1)
FROM
{course_modules_completion}
WHERE
coursemoduleid=? AND completionstate<>0", array($cm->id));
}
/**
* Determines how much course completion data exists for a course. This is used when
* deciding whether completion information should be 'locked' in the completion
* settings form and activity completion settings.
*
* @global object
* @param int $user_id Optionally only get course completion data for a single user
* @return int The number of users who have completion data stored for this
* course, 0 if none
*/
public function count_course_user_data($user_id = null) {
global $DB;
$sql = '
SELECT
COUNT(1)
FROM
{course_completion_crit_compl}
WHERE
course = ?
';
$params = array($this->course_id);
// Limit data to a single user if an ID is supplied
if ($user_id) {
$sql .= ' AND userid = ?';
$params[] = $user_id;
}
return $DB->get_field_sql($sql, $params);
}
/**
* Check if this course's completion criteria should be locked
*
* @return boolean
*/
public function is_course_locked() {
return (bool) $this->count_course_user_data();
}
/**
* Deletes all course completion completion data.
*
* Intended to be used when unlocking completion criteria settings.
*
* @global object
* @return void
*/
public function delete_course_completion_data() {
global $DB;
$DB->delete_records('course_completions', array('course' => $this->course_id));
$DB->delete_records('course_completion_crit_compl', array('course' => $this->course_id));
}
/**
* Deletes completion state related to an activity for all users.
*
* Intended for use only when the activity itself is deleted.
*
* @global object
* @global object
* @param object $cm Activity
*/
public function delete_all_state($cm) {
global $SESSION, $DB;
// Delete from database
$DB->delete_records('course_modules_completion', array('coursemoduleid'=>$cm->id));
// Erase cache data for current user if applicable
if (isset($SESSION->completioncache) &&
array_key_exists($cm->course, $SESSION->completioncache) &&
array_key_exists($cm->id, $SESSION->completioncache[$cm->course])) {
unset($SESSION->completioncache[$cm->course][$cm->id]);
}
// Check if there is an associated course completion criteria
$criteria = $this->get_criteria(COMPLETION_CRITERIA_TYPE_ACTIVITY);
$acriteria = false;
foreach ($criteria as $criterion) {
if ($criterion->moduleinstance == $cm->id) {
$acriteria = $criterion;
break;
}
}
if ($acriteria) {
// Delete all criteria completions relating to this activity
$DB->delete_records('course_completion_crit_compl', array('course' => $this->course_id, 'criteriaid' => $acriteria->id));
$DB->delete_records('course_completions', array('course' => $this->course_id));
}
}
/**
* Recalculates completion state related to an activity for all users.
*
* Intended for use if completion conditions change. (This should be avoided
* as it may cause some things to become incomplete when they were previously
* complete, with the effect - for example - of hiding a later activity that
* was previously available.)
*
* Resetting state of manual tickbox has same result as deleting state for
* it.
*
* @global object
* @uses COMPLETION_TRACKING_MANUAL
* @uses COMPLETION_UNKNOWN
* @param object $cm Activity
*/
public function reset_all_state($cm) {
global $DB;
if ($cm->completion == COMPLETION_TRACKING_MANUAL) {
$this->delete_all_state($cm);
return;
}
// Get current list of users with completion state
$rs = $DB->get_recordset('course_modules_completion', array('coursemoduleid'=>$cm->id), '', 'userid');
$keepusers = array();
foreach ($rs as $rec) {
$keepusers[] = $rec->userid;
}
$rs->close();
// Delete all existing state [also clears session cache for current user]
$this->delete_all_state($cm);
// Merge this with list of planned users (according to roles)
$trackedusers = $this->get_tracked_users();
foreach ($trackedusers as $trackeduser) {
$keepusers[] = $trackeduser->id;
}
$keepusers = array_unique($keepusers);
// Recalculate state for each kept user
foreach ($keepusers as $keepuser) {
$this->update_state($cm, COMPLETION_UNKNOWN, $keepuser);
}
}
/**
* Obtains completion data for a particular activity and user (from the
* session cache if available, or by SQL query)
*
* @global object
* @global object
* @global object
* @global object
* @uses COMPLETION_CACHE_EXPIRY
* @param object $cm Activity; only required field is ->id
* @param bool $wholecourse If true (default false) then, when necessary to
* fill the cache, retrieves information from the entire course not just for
* this one activity
* @param int $userid User ID or 0 (default) for current user
* @param array $modinfo Supply the value here - this is used for unit
* testing and so that it can be called recursively from within
* get_fast_modinfo. (Needs only list of all CMs with IDs.)
* Otherwise the method calls get_fast_modinfo itself.
* @return object Completion data (record from course_modules_completion)
*/
public function get_data($cm, $wholecourse=false, $userid=0, $modinfo=null) {
global $USER, $CFG, $SESSION, $DB;
// Get user ID
if (!$userid) {
$userid = $USER->id;
}
// Is this the current user?
$currentuser = $userid==$USER->id;
if ($currentuser && is_object($SESSION)) {
// Make sure cache is present and is for current user (loginas
// changes this)
if (!isset($SESSION->completioncache) || $SESSION->completioncacheuserid!=$USER->id) {
$SESSION->completioncache = array();
$SESSION->completioncacheuserid = $USER->id;
}
// Expire any old data from cache
foreach ($SESSION->completioncache as $courseid=>$activities) {
if (empty($activities['updated']) || $activities['updated'] < time()-COMPLETION_CACHE_EXPIRY) {
unset($SESSION->completioncache[$courseid]);
}
}
// See if requested data is present, if so use cache to get it
if (isset($SESSION->completioncache) &&
array_key_exists($this->course->id, $SESSION->completioncache) &&
array_key_exists($cm->id, $SESSION->completioncache[$this->course->id])) {
return $SESSION->completioncache[$this->course->id][$cm->id];
}
}
// Not there, get via SQL
if ($currentuser && $wholecourse) {
// Get whole course data for cache
$alldatabycmc = $DB->get_records_sql("
SELECT
cmc.*
FROM
{course_modules} cm
INNER JOIN {course_modules_completion} cmc ON cmc.coursemoduleid=cm.id
WHERE
cm.course=? AND cmc.userid=?", array($this->course->id, $userid));
// Reindex by cm id
$alldata = array();
if ($alldatabycmc) {
foreach ($alldatabycmc as $data) {
$alldata[$data->coursemoduleid] = $data;
}
}
// Get the module info and build up condition info for each one
if (empty($modinfo)) {
$modinfo = get_fast_modinfo($this->course, $userid);
}
foreach ($modinfo->cms as $othercm) {
if (array_key_exists($othercm->id, $alldata)) {
$data = $alldata[$othercm->id];
} else {
// Row not present counts as 'not complete'
$data = new StdClass;
$data->id = 0;
$data->coursemoduleid = $othercm->id;
$data->userid = $userid;
$data->completionstate = 0;
$data->viewed = 0;
$data->timemodified = 0;
}
$SESSION->completioncache[$this->course->id][$othercm->id] = $data;
}
$SESSION->completioncache[$this->course->id]['updated'] = time();
if (!isset($SESSION->completioncache[$this->course->id][$cm->id])) {
$this->internal_systemerror("Unexpected error: course-module {$cm->id} could not be found on course {$this->course->id}");
}
return $SESSION->completioncache[$this->course->id][$cm->id];
} else {
// Get single record
$data = $DB->get_record('course_modules_completion', array('coursemoduleid'=>$cm->id, 'userid'=>$userid));
if ($data == false) {
// Row not present counts as 'not complete'
$data = new StdClass;
$data->id = 0;
$data->coursemoduleid = $cm->id;
$data->userid = $userid;
$data->completionstate = 0;
$data->viewed = 0;
$data->timemodified = 0;
}
// Put in cache
if ($currentuser) {
$SESSION->completioncache[$this->course->id][$cm->id] = $data;
// For single updates, only set date if it was empty before
if (empty($SESSION->completioncache[$this->course->id]['updated'])) {
$SESSION->completioncache[$this->course->id]['updated'] = time();
}
}
}
return $data;
}
/**
* Updates completion data for a particular coursemodule and user (user is
* determined from $data).
*
* (Internal function. Not private, so we can unit-test it.)
*
* @global object
* @global object
* @global object
* @param object $cm Activity
* @param object $data Data about completion for that user
*/
function internal_set_data($cm, $data) {
global $USER, $SESSION, $DB;
if ($data->id) {
// Has real (nonzero) id meaning that a database row exists
$DB->update_record('course_modules_completion', $data);
} else {
// Didn't exist before, needs creating
$data->id = $DB->insert_record('course_modules_completion', $data);
}
if ($data->userid == $USER->id) {
$SESSION->completioncache[$cm->course][$cm->id] = $data;
$reset = 'reset';
get_fast_modinfo($reset);
}
}
/**
* Obtains a list of activities for which completion is enabled on the
* course. The list is ordered by the section order of those activities.
*
* @global object
* @uses COMPLETION_TRACKING_NONE
* @param array $modinfo For unit testing only, supply the value
* here. Otherwise the method calls get_fast_modinfo
* @return array Array from $cmid => $cm of all activities with completion enabled,
* empty array if none
*/
public function get_activities($modinfo=null) {
global $DB;
// Obtain those activities which have completion turned on
$withcompletion = $DB->get_records_select('course_modules', 'course='.$this->course->id.
' AND completion<>'.COMPLETION_TRACKING_NONE);
if (!$withcompletion) {
return array();
}
// Use modinfo to get section order and also add in names
if (empty($modinfo)) {
$modinfo = get_fast_modinfo($this->course);
}
$result = array();
foreach ($modinfo->sections as $sectioncms) {
foreach ($sectioncms as $cmid) {
if (array_key_exists($cmid, $withcompletion)) {
$result[$cmid] = $withcompletion[$cmid];
$result[$cmid]->modname = $modinfo->cms[$cmid]->modname;
$result[$cmid]->name = $modinfo->cms[$cmid]->name;
}
}
}
return $result;
}
/**
* Checks to see if the userid supplied has a tracked role in
* this course
*
* @param $userid User id
* @return bool
*/
function is_tracked_user($userid) {
global $DB;
$tracked = $this->generate_tracked_user_sql();
$sql = "SELECT u.id ";