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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/>.
/**
* The file defines some subclasses that can be used when you are building
* a report like the overview or responses report, that basically has one
* row per attempt.
*
* @package mod
* @subpackage quiz
* @copyright 2010 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir.'/tablelib.php');
/**
* Base class for quiz reports that are basically a table with one row for each attempt.
*
* @copyright 2010 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class quiz_attempt_report extends quiz_default_report {
/** @var object the quiz context. */
protected $context;
/** @var boolean caches the results of {@link should_show_grades()}. */
protected $showgrades = null;
/**
* Should the grades be displayed in this report. That depends on the quiz
* display options, and whether the quiz is graded.
* @param object $quiz the quiz settings.
* @return bool
*/
protected function should_show_grades($quiz) {
if (!is_null($this->showgrades)) {
return $this->showgrades;
}
if ($quiz->timeclose && time() > $quiz->timeclose) {
$when = mod_quiz_display_options::AFTER_CLOSE;
} else {
$when = mod_quiz_display_options::LATER_WHILE_OPEN;
}
$reviewoptions = mod_quiz_display_options::make_from_quiz($quiz, $when);
$this->showgrades = quiz_has_grades($quiz) &&
($reviewoptions->marks >= question_display_options::MARK_AND_MAX ||
has_capability('moodle/grade:viewhidden', $this->context));
return $this->showgrades;
}
/**
* Get information about which students to show in the report.
* @param object $cm the coures module.
* @return an array with four elements:
* 0 => integer the current group id (0 for none).
* 1 => array ids of all the students in this course.
* 2 => array ids of all the students in the current group.
* 3 => array ids of all the students to show in the report. Will be the
* same as either element 1 or 2.
*/
protected function load_relevant_students($cm) {
$currentgroup = groups_get_activity_group($cm, true);
if (!$students = get_users_by_capability($this->context,
array('mod/quiz:reviewmyattempts', 'mod/quiz:attempt'),
'u.id, 1', '', '', '', '', '', false)) {
$students = array();
} else {
$students = array_keys($students);
}
if (empty($currentgroup)) {
return array($currentgroup, $students, array(), $students);
}
// We have a currently selected group.
if (!$groupstudents = get_users_by_capability($this->context,
array('mod/quiz:reviewmyattempts', 'mod/quiz:attempt'),
'u.id, 1', '', '', '', $currentgroup, '', false)) {
$groupstudents = array();
} else {
$groupstudents = array_keys($groupstudents);
}
return array($currentgroup, $students, $groupstudents, $groupstudents);
}
/**
* Alters $attemptsmode and $pagesize if the current values are inappropriate.
* @param int $attemptsmode what sort of attempts to display (may be updated)
* @param int $pagesize number of records to display per page (may be updated)
* @param object $course the course settings.
* @param int $currentgroup the currently selected group. 0 for none.
*/
protected function validate_common_options(&$attemptsmode, &$pagesize, $course, $currentgroup) {
if ($currentgroup) {
//default for when a group is selected
if ($attemptsmode === null || $attemptsmode == QUIZ_REPORT_ATTEMPTS_ALL) {
$attemptsmode = QUIZ_REPORT_ATTEMPTS_STUDENTS_WITH;
}
} else if (!$currentgroup && $course->id == SITEID) {
//force report on front page to show all, unless a group is selected.
$attemptsmode = QUIZ_REPORT_ATTEMPTS_ALL;
} else if ($attemptsmode === null) {
//default
$attemptsmode = QUIZ_REPORT_ATTEMPTS_ALL;
}
if ($pagesize < 1) {
$pagesize = QUIZ_REPORT_DEFAULT_PAGE_SIZE;
}
}
/**
* Contruct all the parts of the main database query.
* @param object $quiz the quiz settings.
* @param string $qmsubselect SQL fragment from {@link quiz_report_qm_filter_select()}.
* @param bool $qmfilter whether to show all, or only the final grade attempt.
* @param int $attemptsmode which attempts to show.
* One of the QUIZ_REPORT_ATTEMPTS_... constants.
* @param array $reportstudents list if userids of users to include in the report.
* @return array with 4 elements ($fields, $from, $where, $params) that can be used to
* build the actual database query.
*/
protected function base_sql($quiz, $qmsubselect, $qmfilter, $attemptsmode, $reportstudents) {
global $DB;
$fields = $DB->sql_concat('u.id', "'#'", 'COALESCE(quiza.attempt, 0)') . ' AS uniqueid,';
if ($qmsubselect) {
$fields .= "\n(CASE WHEN $qmsubselect THEN 1 ELSE 0 END) AS gradedattempt,";
}
$fields .= '
quiza.uniqueid AS usageid,
quiza.id AS attempt,
u.id AS userid,
u.idnumber,
u.firstname,
u.lastname,
u.picture,
u.imagealt,
u.institution,
u.department,
u.email,
quiza.sumgrades,
quiza.timefinish,
quiza.timestart,
CASE WHEN quiza.timefinish = 0 THEN null
WHEN quiza.timefinish > quiza.timestart THEN quiza.timefinish - quiza.timestart
ELSE 0 END AS duration';
// To explain that last bit, in MySQL, qa.timestart and qa.timefinish
// are unsigned. Since MySQL 5.5.5, when they introduced strict mode,
// subtracting a larger unsigned int from a smaller one gave an error.
// Therefore, we avoid doing that. timefinish can be non-zero and less
// than timestart when you have two load-balanced servers with very
// badly synchronised clocks, and a student does a really quick attempt.';
// This part is the same for all cases - join users and quiz_attempts tables
$from = "\n{user} u";
$from .= "\nLEFT JOIN {quiz_attempts} quiza ON
quiza.userid = u.id AND quiza.quiz = :quizid";
$params = array('quizid' => $quiz->id);
if ($qmsubselect && $qmfilter) {
$from .= " AND $qmsubselect";
}
switch ($attemptsmode) {
case QUIZ_REPORT_ATTEMPTS_ALL:
// Show all attempts, including students who are no longer in the course
$where = 'quiza.id IS NOT NULL AND quiza.preview = 0';
break;
case QUIZ_REPORT_ATTEMPTS_STUDENTS_WITH:
// Show only students with attempts
list($usql, $uparams) = $DB->get_in_or_equal(
$reportstudents, SQL_PARAMS_NAMED, 'u');
$params += $uparams;
$where = "u.id $usql AND quiza.preview = 0 AND quiza.id IS NOT NULL";
break;
case QUIZ_REPORT_ATTEMPTS_STUDENTS_WITH_NO:
// Show only students without attempts
list($usql, $uparams) = $DB->get_in_or_equal(
$reportstudents, SQL_PARAMS_NAMED, 'u');
$params += $uparams;
$where = "u.id $usql AND quiza.id IS NULL";
break;
case QUIZ_REPORT_ATTEMPTS_ALL_STUDENTS:
// Show all students with or without attempts
list($usql, $uparams) = $DB->get_in_or_equal(
$reportstudents, SQL_PARAMS_NAMED, 'u');
$params += $uparams;
$where = "u.id $usql AND (quiza.preview = 0 OR quiza.preview IS NULL)";
break;
}
return array($fields, $from, $where, $params);
}
/**
* Add all the user-related columns to the $columns and $headers arrays.
* @param table_sql $table the table being constructed.
* @param array $columns the list of columns. Added to.
* @param array $headers the columns headings. Added to.
*/
protected function add_user_columns($table, &$columns, &$headers) {
global $CFG;
if (!$table->is_downloading() && $CFG->grade_report_showuserimage) {
$columns[] = 'picture';
$headers[] = '';
}
if (!$table->is_downloading()) {
$columns[] = 'fullname';
$headers[] = get_string('name');
} else {
$columns[] = 'lastname';
$headers[] = get_string('lastname');
$columns[] = 'firstname';
$headers[] = get_string('firstname');
}
if ($CFG->grade_report_showuseridnumber) {
$columns[] = 'idnumber';
$headers[] = get_string('idnumber');
}
if ($table->is_downloading()) {
$columns[] = 'institution';
$headers[] = get_string('institution');
$columns[] = 'department';
$headers[] = get_string('department');
$columns[] = 'email';
$headers[] = get_string('email');
}
}
/**
* Set the display options for the user-related columns in the table.
* @param table_sql $table the table being constructed.
*/
protected function configure_user_columns($table) {
$table->column_suppress('picture');
$table->column_suppress('fullname');
$table->column_suppress('idnumber');
$table->column_class('picture', 'picture');
$table->column_class('lastname', 'bold');
$table->column_class('firstname', 'bold');
$table->column_class('fullname', 'bold');
}
/**
* Add all the time-related columns to the $columns and $headers arrays.
* @param array $columns the list of columns. Added to.
* @param array $headers the columns headings. Added to.
*/
protected function add_time_columns(&$columns, &$headers) {
$columns[] = 'timestart';
$headers[] = get_string('startedon', 'quiz');
$columns[] = 'timefinish';
$headers[] = get_string('timecompleted', 'quiz');
$columns[] = 'duration';
$headers[] = get_string('attemptduration', 'quiz');
}
/**
* Add all the grade and feedback columns, if applicable, to the $columns
* and $headers arrays.
* @param object $quiz the quiz settings.
* @param array $columns the list of columns. Added to.
* @param array $headers the columns headings. Added to.
*/
protected function add_grade_columns($quiz, &$columns, &$headers) {
if ($this->should_show_grades($quiz)) {
$columns[] = 'sumgrades';
$headers[] = get_string('grade', 'quiz') . '/' .
quiz_format_grade($quiz, $quiz->grade);
}
if (quiz_has_feedback($quiz)) {
$columns[] = 'feedbacktext';
$headers[] = get_string('feedback', 'quiz');
}
}
/**
* Set up the table.
* @param table_sql $table the table being constructed.
* @param array $columns the list of columns.
* @param array $headers the columns headings.
* @param moodle_url $reporturl the URL of this report.
* @param array $displayoptions the display options.
* @param bool $collapsible whether to allow columns in the report to be collapsed.
*/
protected function set_up_table_columns($table, $columns, $headers, $reporturl,
$displayoptions, $collapsible) {
$table->define_columns($columns);
$table->define_headers($headers);
$table->sortable(true, 'uniqueid');
$table->define_baseurl($reporturl->out(false, $displayoptions));
$this->configure_user_columns($table);
$table->no_sorting('feedbacktext');
$table->column_class('sumgrades', 'bold');
$table->set_attribute('id', 'attempts');
$table->collapsible($collapsible);
}
/**
* Delete the quiz attempts
* @param object $quiz the quiz settings. Attempts that don't belong to
* this quiz are not deleted.
* @param object $cm the course_module object.
* @param array $attemptids the list of attempt ids to delete.
* @param array $allowed This list of userids that are visible in the report.
* Users can only delete attempts that they are allowed to see in the report.
* Empty means all users.
*/
protected function delete_selected_attempts($quiz, $cm, $attemptids, $allowed) {
global $DB;
foreach ($attemptids as $attemptid) {
$attempt = $DB->get_record('quiz_attempts', array('id' => $attemptid));
if (!$attempt || $attempt->quiz != $quiz->id || $attempt->preview != 0) {
// Ensure the attempt exists, and belongs to this quiz. If not skip.
continue;
}
if ($allowed && !array_key_exists($attempt->userid, $allowed)) {
// Ensure the attempt belongs to a student included in the report. If not skip.
continue;
}
add_to_log($quiz->course, 'quiz', 'delete attempt', 'report.php?id=' . $cm->id,
$attemptid, $cm->id);
quiz_delete_attempt($attempt, $quiz);
}
}
}
/**
* Base class for the table used by {@link quiz_attempt_report}s.
*
* @copyright 2010 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class quiz_attempt_report_table extends table_sql {
public $useridfield = 'userid';
/** @var moodle_url the URL of this report. */
protected $reporturl;
/** @var array the display options. */
protected $displayoptions;
/**
* @var array information about the latest step of each question.
* Loaded by {@link load_question_latest_steps()}, if applicable.
*/
protected $lateststeps = null;
protected $quiz;
protected $context;
protected $qmsubselect;
protected $groupstudents;
protected $students;
protected $questions;
protected $candelete;
public function __construct($uniqueid, $quiz, $context, $qmsubselect, $groupstudents,
$students, $questions, $candelete, $reporturl, $displayoptions) {
parent::__construct($uniqueid);
$this->quiz = $quiz;
$this->context = $context;
$this->qmsubselect = $qmsubselect;
$this->groupstudents = $groupstudents;
$this->students = $students;
$this->questions = $questions;
$this->candelete = $candelete;
$this->reporturl = $reporturl;
$this->displayoptions = $displayoptions;
}
public function col_checkbox($attempt) {
if ($attempt->attempt) {
return '<input type="checkbox" name="attemptid[]" value="'.$attempt->attempt.'" />';
} else {
return '';
}
}
public function col_picture($attempt) {
global $COURSE, $OUTPUT;
$user = new stdClass();
$user->id = $attempt->userid;
$user->lastname = $attempt->lastname;
$user->firstname = $attempt->firstname;
$user->imagealt = $attempt->imagealt;
$user->picture = $attempt->picture;
$user->email = $attempt->email;
return $OUTPUT->user_picture($user);
}
public function col_fullname($attempt) {
$html = parent::col_fullname($attempt);
if ($this->is_downloading()) {
return $html;
}
return $html . html_writer::empty_tag('br') . html_writer::link(
new moodle_url('/mod/quiz/review.php', array('attempt' => $attempt->attempt)),
get_string('reviewattempt', 'quiz'), array('class' => 'reviewlink'));
}
public function col_timestart($attempt) {
if ($attempt->attempt) {
return userdate($attempt->timestart, $this->strtimeformat);
} else {
return '-';
}
}
public function col_timefinish($attempt) {
if ($attempt->attempt && $attempt->timefinish) {
return userdate($attempt->timefinish, $this->strtimeformat);
} else {
return '-';
}
}
public function col_duration($attempt) {
if ($attempt->timefinish) {
return format_time($attempt->timefinish - $attempt->timestart);
} else if ($attempt->timestart) {
return get_string('unfinished', 'quiz');
} else {
return '-';
}
}
public function col_feedbacktext($attempt) {
if (!$attempt->timefinish) {
return '-';
}
$feedback = quiz_report_feedback_for_grade(
quiz_rescale_grade($attempt->sumgrades, $this->quiz, false),
$this->quiz->id, $this->context);
if ($this->is_downloading()) {
$feedback = strip_tags($feedback);
}
return $feedback;
}
public function get_row_class($attempt) {
if ($this->qmsubselect && $attempt->gradedattempt) {
return 'gradedattempt';
} else {
return '';
}
}
/**
* Make a link to review an individual question in a popup window.
*
* @param string $data HTML fragment. The text to make into the link.
* @param object $attempt data for the row of the table being output.
* @param int $slot the number used to identify this question within this usage.
*/
public function make_review_link($data, $attempt, $slot) {
global $OUTPUT;
$stepdata = $this->lateststeps[$attempt->usageid][$slot];
$state = question_state::get($stepdata->state);
$flag = '';
if ($stepdata->flagged) {
$flag = ' ' . $OUTPUT->pix_icon('i/flagged', get_string('flagged', 'question'),
'moodle', array('class' => 'questionflag'));
}
$feedbackimg = '';
if ($state->is_finished() && $state != question_state::$needsgrading) {
$feedbackimg = ' ' . $this->icon_for_fraction($stepdata->fraction);
}
$output = html_writer::tag('span', html_writer::tag('span',
$data . $feedbackimg . $flag,
array('class' => $state->get_state_class(true))), array('class' => 'que'));
$url = new moodle_url('/mod/quiz/reviewquestion.php',
array('attempt' => $attempt->attempt, 'slot' => $slot));
$output = $OUTPUT->action_link($url, $output,
new popup_action('click', $url, 'reviewquestion',
array('height' => 450, 'width' => 650)),
array('title' => get_string('reviewresponse', 'quiz')));
return $output;
}
/**
* Return an appropriate icon (green tick, red cross, etc.) for a grade.
* @param float $fraction grade on a scale 0..1.
* @return string html fragment.
*/
protected function icon_for_fraction($fraction) {
global $OUTPUT;
$state = question_state::graded_state_for_fraction($fraction);
if ($state == question_state::$gradedright) {
$icon = 'i/tick_green_big';
} else if ($state == question_state::$gradedpartial) {
$icon = 'i/tick_amber_big';
} else {
$icon = 'i/cross_red_big';
}
return $OUTPUT->pix_icon($icon, get_string($state->get_feedback_class(), 'question'),
'moodle', array('class' => 'icon'));
}
/**
* Load information about the latest state of selected questions in selected attempts.
*
* The results are returned as an two dimensional array $qubaid => $slot => $dataobject
*
* @param qubaid_condition $qubaids used to restrict which usages are included
* in the query. See {@link qubaid_condition}.
* @param array $slots A list of slots for the questions you want to konw about.
* @return array of records. See the SQL in this function to see the fields available.
*/
protected function load_question_latest_steps(qubaid_condition $qubaids) {
$dm = new question_engine_data_mapper();
$latesstepdata = $dm->load_questions_usages_latest_steps(
$qubaids, array_keys($this->questions));
$lateststeps = array();
foreach ($latesstepdata as $step) {
$lateststeps[$step->questionusageid][$step->slot] = $step;
}
return $lateststeps;
}
/**
* @return bool should {@link query_db()} call {@link load_question_latest_steps}?
*/
protected function requires_latest_steps_loaded() {
return false;
}
/**
* Is this a column that depends on joining to the latest state information?
* If so, return the corresponding slot. If not, return false.
* @param string $column a column name
* @return int false if no, else a slot.
*/
protected function is_latest_step_column($column) {
return false;
}
/**
* Get any fields that might be needed when sorting on date for a particular slot.
* @param int $slot the slot for the column we want.
* @param string $alias the table alias for latest state information relating to that slot.
*/
protected function get_required_latest_state_fields($slot, $alias) {
return '';
}
/**
* Add the information about the latest state of the question with slot
* $slot to the query.
*
* The extra information is added as a join to a
* 'table' with alias qa$slot, with columns that are a union of
* the columns of the question_attempts and question_attempts_states tables.
*
* @param int $slot the question to add information for.
*/
protected function add_latest_state_join($slot) {
$alias = 'qa' . $slot;
$fields = $this->get_required_latest_state_fields($slot, $alias);
if (!$fields) {
return;
}
// This condition roughly filters the list of attempts to be considered.
// It is only used in a subselect to help crappy databases (see MDL-30122)
// therefore, it is better to use a very simple join, which may include
// too many records, than to do a super-accurate join.
$qubaids = new qubaid_join("{quiz_attempts} {$alias}quiza", "{$alias}quiza.uniqueid",
"{$alias}quiza.quiz = :{$alias}quizid", array("{$alias}quizid" => $this->sql->params['quizid']));
$dm = new question_engine_data_mapper();
list($inlineview, $viewparams) = $dm->question_attempt_latest_state_view($alias, $qubaids);
$this->sql->fields .= ",\n$fields";
$this->sql->from .= "\nLEFT JOIN $inlineview ON " .
"$alias.questionusageid = quiza.uniqueid AND $alias.slot = :{$alias}slot";
$this->sql->params[$alias . 'slot'] = $slot;
$this->sql->params = array_merge($this->sql->params, $viewparams);
}
/**
* Get an appropriate qubaid_condition for loading more data about the
* attempts we are displaying.
* @return qubaid_condition
*/
protected function get_qubaids_condition() {
if (is_null($this->rawdata)) {
throw new coding_exception(
'Cannot call get_qubaids_condition until the main data has been loaded.');
}
if ($this->is_downloading()) {
// We want usages for all attempts.
return new qubaid_join($this->sql->from, 'quiza.uniqueid',
$this->sql->where, $this->sql->params);
}
$qubaids = array();
foreach ($this->rawdata as $attempt) {
if ($attempt->usageid > 0) {
$qubaids[] = $attempt->usageid;
}
}
return new qubaid_list($qubaids);
}
public function query_db($pagesize, $useinitialsbar = true) {
$doneslots = array();
foreach ($this->get_sort_columns() as $column => $notused) {
$slot = $this->is_latest_step_column($column);
if ($slot && !in_array($slot, $doneslots)) {
$this->add_latest_state_join($slot);
$doneslots[] = $slot;
}
}
parent::query_db($pagesize, $useinitialsbar);
if ($this->requires_latest_steps_loaded()) {
$qubaids = $this->get_qubaids_condition();
$this->lateststeps = $this->load_question_latest_steps($qubaids);
}
}
public function get_sort_columns() {
// Add attemptid as a final tie-break to the sort. This ensures that
// Attempts by the same student appear in order when just sorting by name.
$sortcolumns = parent::get_sort_columns();
$sortcolumns['quiza.id'] = SORT_ASC;
return $sortcolumns;
}
}
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