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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* A collection of all the question statistics calculated for an activity instance ie. the stats calculated for slots and
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* sub-questions and variants of those questions.
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*
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* @package core_question
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* @copyright 2014 The Open University
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* @author James Pratt me@jamiep.org
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace core_question\statistics\questions;
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use question_bank;
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/**
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* A collection of all the question statistics calculated for an activity instance.
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*
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* @package core_question
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* @copyright 2014 The Open University
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* @author James Pratt me@jamiep.org
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class all_calculated_for_qubaid_condition {
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/**
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* @var int previously, the time after which statistics are automatically recomputed.
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* @deprecated since Moodle 4.3. Use of pre-computed stats is no longer time-limited.
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* @todo MDL-78090 Final deprecation in Moodle 4.7
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*/
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const TIME_TO_CACHE = 900; // 15 minutes.
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/**
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* @var object[]
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*/
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public $subquestions = [];
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/**
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* Holds slot (position) stats and stats for variants of questions in slots.
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*
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* @var calculated[]
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*/
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public $questionstats = array();
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/**
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* Holds sub-question stats and stats for variants of subqs.
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*
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* @var calculated_for_subquestion[]
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*/
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public $subquestionstats = array();
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/**
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* Set up a calculated_for_subquestion instance ready to store a randomly selected question's stats.
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*
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* @param object $step
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* @param int|null $variant Is this to keep track of a variant's stats? If so what is the variant, if not null.
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*/
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public function initialise_for_subq($step, $variant = null) {
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$newsubqstat = new calculated_for_subquestion($step, $variant);
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if ($variant === null) {
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$this->subquestionstats[$step->questionid] = $newsubqstat;
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} else {
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$this->subquestionstats[$step->questionid]->variantstats[$variant] = $newsubqstat;
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}
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}
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/**
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* Set up a calculated instance ready to store a slot question's stats.
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*
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* @param int $slot
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* @param object $question
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* @param int|null $variant Is this to keep track of a variant's stats? If so what is the variant, if not null.
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*/
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public function initialise_for_slot($slot, $question, $variant = null) {
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$newqstat = new calculated($question, $slot, $variant);
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if ($variant === null) {
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$this->questionstats[$slot] = $newqstat;
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} else {
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$this->questionstats[$slot]->variantstats[$variant] = $newqstat;
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}
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}
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/**
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* Do we have stats for a particular quesitonid (and optionally variant)?
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*
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* @param int $questionid The id of the sub question.
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* @param int|null $variant if not null then we want the object to store a variant of a sub-question's stats.
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* @return bool whether those stats exist (yet).
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*/
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public function has_subq($questionid, $variant = null) {
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if ($variant === null) {
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return isset($this->subquestionstats[$questionid]);
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} else {
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return isset($this->subquestionstats[$questionid]->variantstats[$variant]);
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}
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}
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/**
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* Reference for a item stats instance for a questionid and optional variant no.
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*
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* @param int $questionid The id of the sub question.
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* @param int|null $variant if not null then we want the object to store a variant of a sub-question's stats.
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* @return calculated|calculated_for_subquestion stats instance for a questionid and optional variant no.
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* Will be a calculated_for_subquestion if no variant specified.
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* @throws \coding_exception if there is an attempt to respond to a non-existant set of stats.
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*/
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public function for_subq($questionid, $variant = null) {
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if ($variant === null) {
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if (!isset($this->subquestionstats[$questionid])) {
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throw new \coding_exception('Reference to unknown question id ' . $questionid);
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} else {
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return $this->subquestionstats[$questionid];
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}
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} else {
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if (!isset($this->subquestionstats[$questionid]->variantstats[$variant])) {
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throw new \coding_exception('Reference to unknown question id ' . $questionid .
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' variant ' . $variant);
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} else {
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return $this->subquestionstats[$questionid]->variantstats[$variant];
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}
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}
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}
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/**
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* ids of all randomly selected question for all slots.
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*
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* @return int[] An array of all sub-question ids.
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*/
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public function get_all_subq_ids() {
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return array_keys($this->subquestionstats);
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}
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/**
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* All slots nos that stats have been calculated for.
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*
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* @return int[] An array of all slot nos.
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*/
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public function get_all_slots() {
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return array_keys($this->questionstats);
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}
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/**
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* Do we have stats for a particular slot (and optionally variant)?
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*
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* @param int $slot The slot no.
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* @param int|null $variant if provided then we want the object which stores a variant of a position's stats.
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* @return bool whether those stats exist (yet).
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*/
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public function has_slot($slot, $variant = null) {
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if ($variant === null) {
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return isset($this->questionstats[$slot]);
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} else {
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return isset($this->questionstats[$slot]->variantstats[$variant]);
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}
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}
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/**
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* Get position stats instance for a slot and optional variant no.
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*
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* @param int $slot The slot no.
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* @param int|null $variant if provided then we want the object which stores a variant of a position's stats.
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* @return calculated|calculated_for_subquestion An instance of the class storing the calculated position stats.
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* @throws \coding_exception if there is an attempt to respond to a non-existant set of stats.
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*/
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public function for_slot($slot, $variant = null) {
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if ($variant === null) {
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if (!isset($this->questionstats[$slot])) {
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throw new \coding_exception('Reference to unknown slot ' . $slot);
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} else {
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return $this->questionstats[$slot];
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}
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} else {
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if (!isset($this->questionstats[$slot]->variantstats[$variant])) {
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throw new \coding_exception('Reference to unknown slot ' . $slot . ' variant ' . $variant);
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} else {
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return $this->questionstats[$slot]->variantstats[$variant];
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}
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}
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}
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/**
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* Load cached statistics from the database.
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*
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* @param \qubaid_condition $qubaids Which question usages to load stats for?
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*/
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public function get_cached($qubaids) {
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global $DB;
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$timemodified = self::get_last_calculated_time($qubaids);
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$questionstatrecs = $DB->get_records('question_statistics',
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['hashcode' => $qubaids->get_hash_code(), 'timemodified' => $timemodified]);
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$questionids = array();
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foreach ($questionstatrecs as $fromdb) {
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if (is_null($fromdb->variant) && !$fromdb->slot) {
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$questionids[] = $fromdb->questionid;
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}
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}
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$this->subquestions = question_load_questions($questionids);
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foreach ($questionstatrecs as $fromdb) {
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if (is_null($fromdb->variant)) {
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if ($fromdb->slot) {
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if (!isset($this->questionstats[$fromdb->slot])) {
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debugging('Statistics found for slot ' . $fromdb->slot .
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' in stats ' . json_encode($qubaids->from_where_params()) .
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' which is not an analysable question.', DEBUG_DEVELOPER);
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}
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$this->questionstats[$fromdb->slot]->populate_from_record($fromdb);
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} else {
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$this->subquestionstats[$fromdb->questionid] = new calculated_for_subquestion();
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$this->subquestionstats[$fromdb->questionid]->populate_from_record($fromdb);
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if (isset($this->subquestions[$fromdb->questionid])) {
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$this->subquestionstats[$fromdb->questionid]->question =
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$this->subquestions[$fromdb->questionid];
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} else {
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$this->subquestionstats[$fromdb->questionid]->question = question_bank::get_qtype(
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'missingtype', false)->make_deleted_instance($fromdb->questionid, 1);
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}
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}
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}
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}
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// Add cached variant stats to data structure.
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foreach ($questionstatrecs as $fromdb) {
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if (!is_null($fromdb->variant)) {
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if ($fromdb->slot) {
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if (!isset($this->questionstats[$fromdb->slot])) {
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debugging('Statistics found for slot ' . $fromdb->slot .
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' in stats ' . json_encode($qubaids->from_where_params()) .
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' which is not an analysable question.', DEBUG_DEVELOPER);
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continue;
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}
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$newcalcinstance = new calculated();
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$this->questionstats[$fromdb->slot]->variantstats[$fromdb->variant] = $newcalcinstance;
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$newcalcinstance->question = $this->questionstats[$fromdb->slot]->question;
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} else {
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$newcalcinstance = new calculated_for_subquestion();
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$this->subquestionstats[$fromdb->questionid]->variantstats[$fromdb->variant] = $newcalcinstance;
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if (isset($this->subquestions[$fromdb->questionid])) {
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$newcalcinstance->question = $this->subquestions[$fromdb->questionid];
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} else {
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$newcalcinstance->question = question_bank::get_qtype(
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'missingtype', false)->make_deleted_instance($fromdb->questionid, 1);
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}
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}
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$newcalcinstance->populate_from_record($fromdb);
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}
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}
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}
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/**
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* Find time of non-expired statistics in the database.
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*
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* @param \qubaid_condition $qubaids Which question usages to look for stats for?
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* @return int|bool Time of cached record that matches this qubaid_condition or false if non found.
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*/
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public function get_last_calculated_time($qubaids) {
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global $DB;
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$lastcalculatedtime = $DB->get_field('question_statistics', 'COALESCE(MAX(timemodified), 0)',
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['hashcode' => $qubaids->get_hash_code()]);
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if ($lastcalculatedtime) {
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return $lastcalculatedtime;
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} else {
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return false;
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}
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}
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/**
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* Save stats to db, first cleaning up any old ones.
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*
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* @param \qubaid_condition $qubaids Which question usages are we caching the stats of?
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*/
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public function cache($qubaids) {
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global $DB;
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$transaction = $DB->start_delegated_transaction();
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$timemodified = time();
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foreach ($this->get_all_slots() as $slot) {
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$this->for_slot($slot)->cache($qubaids, $timemodified);
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}
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foreach ($this->get_all_subq_ids() as $subqid) {
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$this->for_subq($subqid)->cache($qubaids, $timemodified);
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}
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$transaction->allow_commit();
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}
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/**
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* Return all sub-questions used.
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*
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* @return \object[] array of questions.
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*/
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public function get_sub_questions() {
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return $this->subquestions;
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}
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/**
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* Return all stats for one slot, stats for the slot itself, and either :
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* - variants of question
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* - variants of randomly selected questions
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* - randomly selected questions
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*
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* @param int $slot the slot no
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* @param bool|int $limitvariants limit number of variants and sub-questions displayed?
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* @return calculated|calculated_for_subquestion[] stats to display
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*/
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public function structure_analysis_for_one_slot($slot, $limitvariants = false) {
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return array_merge(array($this->for_slot($slot)), $this->all_subq_and_variant_stats_for_slot($slot, $limitvariants));
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}
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/**
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* Call after calculations to output any error messages.
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*
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* @return string[] Array of strings describing error messages found during stats calculation.
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*/
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public function any_error_messages() {
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$errors = array();
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foreach ($this->get_all_slots() as $slot) {
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foreach ($this->for_slot($slot)->get_sub_question_ids() as $subqid) {
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if ($this->for_subq($subqid)->differentweights) {
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$name = $this->for_subq($subqid)->question->name;
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$errors[] = get_string('erroritemappearsmorethanoncewithdifferentweight', 'question', $name);
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}
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}
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}
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return $errors;
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}
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/**
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* Return all stats for variants of question in slot $slot.
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*
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348 |
* @param int $slot The slot no.
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349 |
* @return calculated[] The instances storing the calculated stats.
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350 |
*/
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351 |
protected function all_variant_stats_for_one_slot($slot) {
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352 |
$toreturn = array();
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353 |
foreach ($this->for_slot($slot)->get_variants() as $variant) {
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354 |
$toreturn[] = $this->for_slot($slot, $variant);
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355 |
}
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356 |
return $toreturn;
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357 |
}
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358 |
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359 |
/**
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|
360 |
* Return all stats for variants of randomly selected questions for one slot $slot.
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361 |
*
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362 |
* @param int $slot The slot no.
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363 |
* @return calculated[] The instances storing the calculated stats.
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364 |
*/
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365 |
protected function all_subq_variants_for_one_slot($slot) {
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366 |
$toreturn = array();
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367 |
$displayorder = 1;
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368 |
foreach ($this->for_slot($slot)->get_sub_question_ids() as $subqid) {
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369 |
if ($variants = $this->for_subq($subqid)->get_variants()) {
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370 |
foreach ($variants as $variant) {
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371 |
$toreturn[] = $this->make_new_subq_stat_for($displayorder, $slot, $subqid, $variant);
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372 |
}
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373 |
}
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374 |
$displayorder++;
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|
375 |
}
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|
376 |
return $toreturn;
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|
377 |
}
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|
378 |
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|
379 |
/**
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|
380 |
* Return all stats for randomly selected questions for one slot $slot.
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|
381 |
*
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|
382 |
* @param int $slot The slot no.
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|
383 |
* @return calculated[] The instances storing the calculated stats.
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|
384 |
*/
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|
385 |
protected function all_subqs_for_one_slot($slot) {
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|
386 |
$displayorder = 1;
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|
387 |
$toreturn = array();
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|
388 |
foreach ($this->for_slot($slot)->get_sub_question_ids() as $subqid) {
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|
389 |
$toreturn[] = $this->make_new_subq_stat_for($displayorder, $slot, $subqid);
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|
390 |
$displayorder++;
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|
391 |
}
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|
392 |
return $toreturn;
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|
393 |
}
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|
394 |
|
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|
395 |
/**
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|
396 |
* Return all variant or 'sub-question' stats one slot, either :
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|
397 |
* - variants of question
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|
398 |
* - variants of randomly selected questions
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|
399 |
* - randomly selected questions
|
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|
400 |
*
|
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|
401 |
* @param int $slot the slot no
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|
|
402 |
* @param bool $limited limit number of variants and sub-questions displayed?
|
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|
403 |
* @return calculated|calculated_for_subquestion|calculated_question_summary[] stats to display
|
|
|
404 |
*/
|
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|
405 |
protected function all_subq_and_variant_stats_for_slot($slot, $limited) {
|
|
|
406 |
// Random question in this slot?
|
|
|
407 |
if ($this->for_slot($slot)->get_sub_question_ids()) {
|
|
|
408 |
$toreturn = array();
|
|
|
409 |
|
|
|
410 |
if ($limited) {
|
|
|
411 |
$randomquestioncalculated = $this->for_slot($slot);
|
|
|
412 |
|
|
|
413 |
if ($subqvariantstats = $this->all_subq_variants_for_one_slot($slot)) {
|
|
|
414 |
// There are some variants from randomly selected questions.
|
|
|
415 |
// If we're showing a limited view of the statistics then add a question summary stat
|
|
|
416 |
// rather than a stat for each subquestion.
|
|
|
417 |
$summarystat = $this->make_new_calculated_question_summary_stat($randomquestioncalculated, $subqvariantstats);
|
|
|
418 |
|
|
|
419 |
$toreturn = array_merge($toreturn, [$summarystat]);
|
|
|
420 |
}
|
|
|
421 |
|
|
|
422 |
if ($subqstats = $this->all_subqs_for_one_slot($slot)) {
|
|
|
423 |
// There are some randomly selected questions.
|
|
|
424 |
// If we're showing a limited view of the statistics then add a question summary stat
|
|
|
425 |
// rather than a stat for each subquestion.
|
|
|
426 |
$summarystat = $this->make_new_calculated_question_summary_stat($randomquestioncalculated, $subqstats);
|
|
|
427 |
|
|
|
428 |
$toreturn = array_merge($toreturn, [$summarystat]);
|
|
|
429 |
}
|
|
|
430 |
|
|
|
431 |
foreach ($toreturn as $index => $calculated) {
|
|
|
432 |
$calculated->subqdisplayorder = $index;
|
|
|
433 |
}
|
|
|
434 |
} else {
|
|
|
435 |
$displaynumber = 1;
|
|
|
436 |
foreach ($this->for_slot($slot)->get_sub_question_ids() as $subqid) {
|
|
|
437 |
$toreturn[] = $this->make_new_subq_stat_for($displaynumber, $slot, $subqid);
|
|
|
438 |
if ($variants = $this->for_subq($subqid)->get_variants()) {
|
|
|
439 |
foreach ($variants as $variant) {
|
|
|
440 |
$toreturn[] = $this->make_new_subq_stat_for($displaynumber, $slot, $subqid, $variant);
|
|
|
441 |
}
|
|
|
442 |
}
|
|
|
443 |
$displaynumber++;
|
|
|
444 |
}
|
|
|
445 |
}
|
|
|
446 |
|
|
|
447 |
return $toreturn;
|
|
|
448 |
} else {
|
|
|
449 |
$variantstats = $this->all_variant_stats_for_one_slot($slot);
|
|
|
450 |
if ($limited && $variantstats) {
|
|
|
451 |
$variantquestioncalculated = $this->for_slot($slot);
|
|
|
452 |
|
|
|
453 |
// If we're showing a limited view of the statistics then add a question summary stat
|
|
|
454 |
// rather than a stat for each variation.
|
|
|
455 |
$summarystat = $this->make_new_calculated_question_summary_stat($variantquestioncalculated, $variantstats);
|
|
|
456 |
|
|
|
457 |
return [$summarystat];
|
|
|
458 |
} else {
|
|
|
459 |
return $variantstats;
|
|
|
460 |
}
|
|
|
461 |
}
|
|
|
462 |
}
|
|
|
463 |
|
|
|
464 |
/**
|
|
|
465 |
* We need a new object for display. Sub-question stats can appear more than once in different slots.
|
|
|
466 |
* So we create a clone of the object and then we can set properties on the object that are per slot.
|
|
|
467 |
*
|
|
|
468 |
* @param int $displaynumber The display number for this sub question.
|
|
|
469 |
* @param int $slot The slot number.
|
|
|
470 |
* @param int $subqid The sub question id.
|
|
|
471 |
* @param null|int $variant The variant no.
|
|
|
472 |
* @return calculated_for_subquestion The object for display.
|
|
|
473 |
*/
|
|
|
474 |
protected function make_new_subq_stat_for($displaynumber, $slot, $subqid, $variant = null) {
|
|
|
475 |
$slotstat = fullclone($this->for_subq($subqid, $variant));
|
|
|
476 |
$slotstat->question->number = $this->for_slot($slot)->question->number;
|
|
|
477 |
$slotstat->subqdisplayorder = $displaynumber;
|
|
|
478 |
return $slotstat;
|
|
|
479 |
}
|
|
|
480 |
|
|
|
481 |
/**
|
|
|
482 |
* Create a summary calculated object for a calculated question. This is used as a placeholder
|
|
|
483 |
* to indicate that a calculated question has sub questions or variations to show rather than listing each
|
|
|
484 |
* subquestion or variation directly.
|
|
|
485 |
*
|
|
|
486 |
* @param calculated $randomquestioncalculated The calculated instance for the random question slot.
|
|
|
487 |
* @param calculated[] $subquestionstats The instances of the calculated stats of the questions that are being summarised.
|
|
|
488 |
* @return calculated_question_summary
|
|
|
489 |
*/
|
|
|
490 |
protected function make_new_calculated_question_summary_stat($randomquestioncalculated, $subquestionstats) {
|
|
|
491 |
$question = $randomquestioncalculated->question;
|
|
|
492 |
$slot = $randomquestioncalculated->slot;
|
|
|
493 |
$calculatedsummary = new calculated_question_summary($question, $slot, $subquestionstats);
|
|
|
494 |
|
|
|
495 |
return $calculatedsummary;
|
|
|
496 |
}
|
|
|
497 |
}
|