mirror_php/moodle
1
0
Fork 0
mirror of https://github.com/moodle/moodle.git synced 2025-01-19 14:27:22 +01:00
Code Issues Projects Releases Wiki Activity
moodle/lib/completionlib.php
sam marshall a854bca3cf MDL-28021 Completion system can create inconsistent database rows 
This change includes:

(1) update deletes older versions of inconsistent rows
(2) update drops one index and replaces it with a new unique index
(3) fixed to ensure that when it decides whether to insert or update
    it uses current database state and not cached info
(4) unit tests updated to test #3

Conflicts:

	lib/db/upgrade.php
	version.php
2011-06-27 15:25:13 +02:00

1344 lines
47 KiB
PHP
Raw Blame History

<?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, $DB;
// First check global completion
if (!isset($CFG->enablecompletion) || $CFG->enablecompletion == COMPLETION_DISABLED) {
return COMPLETION_DISABLED;
}
// Load data if we do not have enough
if (!isset($this->course->enablecompletion)) {
$this->course->enablecompletion = $DB->get_field('course', 'enablecompletion', array('id' => $this->course->id));
}
// Check course completion
if ($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, $UNITTEST;
if ($PAGE->headerprinted && empty($UNITTEST->running)) {
debugging('set_module_viewed must be called before header is printed',
DEBUG_DEVELOPER);
}
// Don't do anything if view condition is not turned on
if ($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;
$transaction = $DB->start_delegated_transaction();
if (!$data->id) {
// Check there isn't really a row
$data->id = $DB->get_field('course_modules_completion', 'id',
array('coursemoduleid'=>$data->coursemoduleid, 'userid'=>$data->userid));
}
if (!$data->id) {
// Didn't exist before, needs creating
$data->id = $DB->insert_record('course_modules_completion', $data);
} else {
// Has real (nonzero) id meaning that a database row exists, update
$DB->update_record('course_modules_completion', $data);
}
$transaction->allow_commit();
if ($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 ";
$sql .= $tracked->sql;
$sql .= ' AND u.id = :userid';
$params = $tracked->data;
$params['userid'] = (int)$userid;
return $DB->record_exists_sql($sql, $params);
}
/**
* Return number of users whose progress is tracked in this course
*
* Optionally supply a search's where clause, or a group id
*
* @param string $where Where clause sql
* @param array $where_params Where clause params
* @param int $groupid Group id
* @return int
*/
function get_num_tracked_users($where = '', $where_params = array(), $groupid = 0) {
global $DB;
$tracked = $this->generate_tracked_user_sql($groupid);
$sql = "SELECT COUNT(u.id) ";
$sql .= $tracked->sql;
if ($where) {
$sql .= " AND $where";
}
$params = array_merge($tracked->data, $where_params);
return $DB->count_records_sql($sql, $params);
}
/**
* Return array of users whose progress is tracked in this course
*
* Optionally supply a search's where caluse, group id, sorting, paging
*
* @param string $where Where clause sql (optional)
* @param array $where_params Where clause params (optional)
* @param integer $groupid Group ID to restrict to (optional)
* @param string $sort Order by clause (optional)
* @param integer $limitfrom Result start (optional)
* @param integer $limitnum Result max size (optional)
* @return array
*/
function get_tracked_users($where = '', $where_params = array(), $groupid = 0,
$sort = '', $limitfrom = '', $limitnum = '') {
global $DB;
$tracked = $this->generate_tracked_user_sql($groupid);
$params = $tracked->data;
$sql = "
SELECT
u.id,
u.firstname,
u.lastname,
u.idnumber
";
$sql .= $tracked->sql;
if ($where) {
$sql .= " AND $where";
$params = array_merge($params, $where_params);
}
if ($sort) {
$sql .= " ORDER BY $sort";
}
$users = $DB->get_records_sql($sql, $params, $limitfrom, $limitnum);
return $users ? $users : array(); // In case it returns false
}
/**
* Generate the SQL for finding tracked users in this course
*
* Returns an object containing the sql fragment and an array of
* bound data params.
*
* @param integer $groupid
* @return object
*/
function generate_tracked_user_sql($groupid = 0) {
global $CFG;
$return = new stdClass();
$return->sql = '';
$return->data = array();
if (!empty($CFG->gradebookroles)) {
$roles = ' AND ra.roleid IN ('.$CFG->gradebookroles.')';
} else {
// This causes it to default to everyone (if there is no student role)
$roles = '';
}
// Build context sql
$context = get_context_instance(CONTEXT_COURSE, $this->course->id);
$parentcontexts = substr($context->path, 1); // kill leading slash
$parentcontexts = str_replace('/', ',', $parentcontexts);
if ($parentcontexts !== '') {
$parentcontexts = ' OR ra.contextid IN ('.$parentcontexts.' )';
}
$groupjoin = '';
$groupselect = '';
if ($groupid) {
$groupjoin = "JOIN {groups_members} gm
ON gm.userid = u.id";
$groupselect = " AND gm.groupid = :groupid ";
$return->data['groupid'] = $groupid;
}
$return->sql = "
FROM
{user} u
INNER JOIN
{role_assignments} ra
ON ra.userid = u.id
INNER JOIN
{role} r
ON r.id = ra.roleid
INNER JOIN
{user_enrolments} ue
ON ue.userid = u.id
INNER JOIN
{enrol} e
ON e.id = ue.enrolid
INNER JOIN
{course} c
ON c.id = e.courseid
$groupjoin
WHERE
(ra.contextid = :contextid $parentcontexts)
AND c.id = :courseid
AND ue.status = 0
AND e.status = 0
AND ue.timestart < :now1
AND (ue.timeend > :now2 OR ue.timeend = 0)
$groupselect
$roles
";
$now = time();
$return->data['now1'] = $now;
$return->data['now2'] = $now;
$return->data['contextid'] = $context->id;
$return->data['courseid'] = $this->course->id;
return $return;
}
/**
* Obtains progress information across a course for all users on that course, or
* for all users in a specific group. Intended for use when displaying progress.
*
* This includes only users who, in course context, have one of the roles for
* which progress is tracked (the gradebookroles admin option) and are enrolled in course.
*
* Users are included (in the first array) even if they do not have
* completion progress for any course-module.
*
* @global object
* @global object
* @param bool $sortfirstname If true, sort by first name, otherwise sort by
* last name
* @param string $where Where clause sql (optional)
* @param array $where_params Where clause params (optional)
* @param int $groupid Group ID or 0 (default)/false for all groups
* @param int $pagesize Number of users to actually return (optional)
* @param int $start User to start at if paging (optional)
* @return Object with ->total and ->start (same as $start) and ->users;
* an array of user objects (like mdl_user id, firstname, lastname)
* containing an additional ->progress array of coursemoduleid => completionstate
*/
public function get_progress_all($where = '', $where_params = array(), $groupid = 0,
$sort = '', $pagesize = '', $start = '') {
global $CFG, $DB;
// Get list of applicable users
$users = $this->get_tracked_users($where, $where_params, $groupid, $sort, $start, $pagesize);
// Get progress information for these users in groups of 1, 000 (if needed)
// to avoid making the SQL IN too long
$results = array();
$userids = array();
foreach ($users as $user) {
$userids[] = $user->id;
$results[$user->id] = $user;
$results[$user->id]->progress = array();
}
for($i=0; $i<count($userids); $i+=1000) {
$blocksize = count($userids)-$i < 1000 ? count($userids)-$i : 1000;
list($insql, $params) = $DB->get_in_or_equal(array_slice($userids, $i, $blocksize));
array_splice($params, 0, 0, array($this->course->id));
$rs = $DB->get_recordset_sql("
SELECT
cmc.*
FROM
{course_modules} cm
INNER JOIN {course_modules_completion} cmc ON cm.id=cmc.coursemoduleid
WHERE
cm.course=? AND cmc.userid $insql
", $params);
foreach ($rs as $progress) {
$progress = (object)$progress;
$results[$progress->userid]->progress[$progress->coursemoduleid] = $progress;
}
$rs->close();
}
return $results;
}
/**
* Called by grade code to inform the completion system when a grade has
* been changed. If the changed grade is used to determine completion for
* the course-module, then the completion status will be updated.
*
* @uses COMPLETION_TRACKING_MANUAL
* @uses COMPLETION_INCOMPLETE
* @param object $cm Course-module for item that owns grade
* @param grade_item $item Grade item
* @param object $grade
* @param bool $deleted
* @return void
*/
public function inform_grade_changed($cm, $item, $grade, $deleted) {
// Bail out now if completion is not enabled for course-module, it is enabled
// but is set to manual, grade is not used to compute completion, or this
// is a different numbered grade
if (!$this->is_enabled($cm) ||
$cm->completion == COMPLETION_TRACKING_MANUAL ||
is_null($cm->completiongradeitemnumber) ||
$item->itemnumber != $cm->completiongradeitemnumber) {
return;
}
// What is the expected result based on this grade?
if ($deleted) {
// Grade being deleted, so only change could be to make it incomplete
$possibleresult = COMPLETION_INCOMPLETE;
} else {
$possibleresult = $this->internal_get_grade_state($item, $grade);
}
// OK, let's update state based on this
$this->update_state($cm, $possibleresult, $grade->userid);
}
/**
* Calculates the completion state that would result from a graded item
* (where grade-based completion is turned on) based on the actual grade
* and settings.
*
* Internal function. Not private, so we can unit-test it.
*
* @uses COMPLETION_INCOMPLETE
* @uses COMPLETION_COMPLETE_PASS
* @uses COMPLETION_COMPLETE_FAIL
* @uses COMPLETION_COMPLETE
* @param object $item grade_item
* @param object $grade grade_grade
* @return int Completion state e.g. COMPLETION_INCOMPLETE
*/
function internal_get_grade_state($item, $grade) {
if (!$grade) {
return COMPLETION_INCOMPLETE;
}
// Conditions to show pass/fail:
// a) Grade has pass mark (default is 0.00000 which is boolean true so be careful)
// b) Grade is visible (neither hidden nor hidden-until)
if ($item->gradepass && $item->gradepass > 0.000009 && !$item->hidden) {
// Use final grade if set otherwise raw grade
$score = !is_null($grade->finalgrade) ? $grade->finalgrade : $grade->rawgrade;
// We are displaying and tracking pass/fail
if ($score >= $item->gradepass) {
return COMPLETION_COMPLETE_PASS;
} else {
return COMPLETION_COMPLETE_FAIL;
}
} else {
// Not displaying pass/fail, so just if there is a grade
if (!is_null($grade->finalgrade) || !is_null($grade->rawgrade)) {
// Grade exists, so maybe complete now
return COMPLETION_COMPLETE;
} else {
// Grade does not exist, so maybe incomplete now
return COMPLETION_INCOMPLETE;
}
}
}
/**
* This is to be used only for system errors (things that shouldn't happen)
* and not user-level errors.
*
* @global object
* @param string $error Error string (will not be displayed to user unless
* debugging is enabled)
* @return void Throws moodle_exception Exception with the error string as debug info
*/
function internal_systemerror($error) {
global $CFG;
throw new moodle_exception('err_system','completion',
$CFG->wwwroot.'/course/view.php?id='.$this->course->id,null,$error);
}
/**
* For testing only. Wipes information cached in user session.
*
* @global object
*/
static function wipe_session_cache() {
global $SESSION;
unset($SESSION->completioncache);
unset($SESSION->completioncacheuserid);
}
}
Reference in New Issue View Git Blame Copy Permalink