Proyectos de Subversion Moodle

<?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/>.

/**

 * @package   mod_choice

 * @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();

/** @global int $CHOICE_COLUMN_HEIGHT */

global $CHOICE_COLUMN_HEIGHT;

$CHOICE_COLUMN_HEIGHT = 300;

/** @global int $CHOICE_COLUMN_WIDTH */

global $CHOICE_COLUMN_WIDTH;

$CHOICE_COLUMN_WIDTH = 300;

define('CHOICE_PUBLISH_ANONYMOUS', '0');

define('CHOICE_PUBLISH_NAMES',     '1');

define('CHOICE_SHOWRESULTS_NOT',          '0');

define('CHOICE_SHOWRESULTS_AFTER_ANSWER', '1');

define('CHOICE_SHOWRESULTS_AFTER_CLOSE',  '2');

define('CHOICE_SHOWRESULTS_ALWAYS',       '3');

define('CHOICE_DISPLAY_HORIZONTAL',  '0');

define('CHOICE_DISPLAY_VERTICAL',    '1');

define('CHOICE_EVENT_TYPE_OPEN', 'open');

define('CHOICE_EVENT_TYPE_CLOSE', 'close');

// Standard functions.

/**

 * @global object

 * @param object $course

 * @param object $user

 * @param object $mod

 * @param object $choice

 * @return object|null

 */

function choice_user_outline($course, $user, $mod, $choice) {

    global $DB;

    if ($answer = $DB->get_record('choice_answers', array('choiceid' => $choice->id, 'userid' => $user->id))) {

        $result = new stdClass();

        $result->info = "'".format_string(choice_get_option_text($choice, $answer->optionid))."'";

        $result->time = $answer->timemodified;

        return $result;

    }

    return NULL;

}

/**

 * Callback for the "Complete" report - prints the activity summary for the given user

 *

 * @param object $course

 * @param object $user

 * @param object $mod

 * @param object $choice

 */

function choice_user_complete($course, $user, $mod, $choice) {

    global $DB;

    if ($answers = $DB->get_records('choice_answers', array("choiceid" => $choice->id, "userid" => $user->id))) {

        $info = [];

        foreach ($answers as $answer) {

            $info[] = "'" . format_string(choice_get_option_text($choice, $answer->optionid)) . "'";

        }

        core_collator::asort($info);

        echo get_string("answered", "choice") . ": ". join(', ', $info) . ". " .

                get_string("updated", '', userdate($answer->timemodified));

    } else {

        print_string("notanswered", "choice");

    }

}

/**

 * Given an object containing all the necessary data,

 * (defined by the form in mod_form.php) this function

 * will create a new instance and return the id number

 * of the new instance.

 *

 * @global object

 * @param object $choice

 * @return int

 */

function choice_add_instance($choice) {

    global $DB, $CFG;

    require_once($CFG->dirroot.'/mod/choice/locallib.php');

    $choice->timemodified = time();

    //insert answers

    $choice->id = $DB->insert_record("choice", $choice);

    foreach ($choice->option as $key => $value) {

        $value = trim($value);

        if (isset($value) && $value <> '') {

            $option = new stdClass();

            $option->text = $value;

            $option->choiceid = $choice->id;

            if (isset($choice->limit[$key])) {

                $option->maxanswers = $choice->limit[$key];

            }

            $option->timemodified = time();

            $DB->insert_record("choice_options", $option);

        }

    }

    // Add calendar events if necessary.

    choice_set_events($choice);

    if (!empty($choice->completionexpected)) {

        \core_completion\api::update_completion_date_event($choice->coursemodule, 'choice', $choice->id,

                $choice->completionexpected);

    }

    return $choice->id;

}

/**

 * Given an object containing all the necessary data,

 * (defined by the form in mod_form.php) this function

 * will update an existing instance with new data.

 *

 * @global object

 * @param object $choice

 * @return bool

 */

function choice_update_instance($choice) {

    global $DB, $CFG;

    require_once($CFG->dirroot.'/mod/choice/locallib.php');

    $choice->id = $choice->instance;

    $choice->timemodified = time();

    //update, delete or insert answers

    foreach ($choice->option as $key => $value) {

        $value = trim($value);

        $option = new stdClass();

        $option->text = $value;

        $option->choiceid = $choice->id;

        if (isset($choice->limit[$key])) {

            $option->maxanswers = $choice->limit[$key];

        }

        $option->timemodified = time();

        if (isset($choice->optionid[$key]) && !empty($choice->optionid[$key])){//existing choice record

            $option->id=$choice->optionid[$key];

            if (isset($value) && $value <> '') {

                $DB->update_record("choice_options", $option);

            } else {

                // Remove the empty (unused) option.

                $DB->delete_records("choice_options", array("id" => $option->id));

                // Delete any answers associated with this option.

                $DB->delete_records("choice_answers", array("choiceid" => $choice->id, "optionid" => $option->id));

            }

        } else {

            if (isset($value) && $value <> '') {

                $DB->insert_record("choice_options", $option);

            }

        }

    }

    // Add calendar events if necessary.

    choice_set_events($choice);

    $completionexpected = (!empty($choice->completionexpected)) ? $choice->completionexpected : null;

    \core_completion\api::update_completion_date_event($choice->coursemodule, 'choice', $choice->id, $completionexpected);

    return $DB->update_record('choice', $choice);

}

/**

 * @global object

 * @param object $choice

 * @param object $user

 * @param object $coursemodule

 * @param array $allresponses

 * @return array

 */

function choice_prepare_options($choice, $user, $coursemodule, $allresponses) {

    global $DB;

    $cdisplay = array('options'=>array());

    $cdisplay['limitanswers'] = $choice->limitanswers;

    $cdisplay['showavailable'] = $choice->showavailable;

    $context = context_module::instance($coursemodule->id);

    foreach ($choice->option as $optionid => $text) {

        if (isset($text)) { //make sure there are no dud entries in the db with blank text values.

            $option = new stdClass;

            $option->attributes = new stdClass;

            $option->attributes->value = $optionid;

            $option->text = format_string($text);

            $option->maxanswers = $choice->maxanswers[$optionid];

            $option->displaylayout = $choice->display;

            if (isset($allresponses[$optionid])) {

                $option->countanswers = count($allresponses[$optionid]);

            } else {

                $option->countanswers = 0;

            }

            if ($DB->record_exists('choice_answers', array('choiceid' => $choice->id, 'userid' => $user->id, 'optionid' => $optionid))) {

                $option->attributes->checked = true;

            }

            if ( $choice->limitanswers && ($option->countanswers >= $option->maxanswers) && empty($option->attributes->checked)) {

                $option->attributes->disabled = true;

            }

            $cdisplay['options'][] = $option;

        }

    }

    $cdisplay['hascapability'] = is_enrolled($context, NULL, 'mod/choice:choose'); //only enrolled users are allowed to make a choice

    if ($choice->allowupdate && $DB->record_exists('choice_answers', array('choiceid'=> $choice->id, 'userid'=> $user->id))) {

        $cdisplay['allowupdate'] = true;

    }

    if ($choice->showpreview && $choice->timeopen > time()) {

        $cdisplay['previewonly'] = true;

    }

    return $cdisplay;

}

/**

 * Modifies responses of other users adding the option $newoptionid to them

 *

 * @param array $userids list of users to add option to (must be users without any answers yet)

 * @param array $answerids list of existing attempt ids of users (will be either appended or

 *      substituted with the newoptionid, depending on $choice->allowmultiple)

 * @param int $newoptionid

 * @param stdClass $choice choice object, result of {@link choice_get_choice()}

 * @param stdClass $cm

 * @param stdClass $course

 */

function choice_modify_responses($userids, $answerids, $newoptionid, $choice, $cm, $course) {

    // Get all existing responses and the list of non-respondents.

    $groupmode = groups_get_activity_groupmode($cm);

    $onlyactive = $choice->includeinactive ? false : true;

    $allresponses = choice_get_response_data($choice, $cm, $groupmode, $onlyactive);

    // Check that the option value is valid.

    if (!$newoptionid || !isset($choice->option[$newoptionid])) {

        return;

    }

    // First add responses for users who did not make any choice yet.

    foreach ($userids as $userid) {

        if (isset($allresponses[0][$userid])) {

            choice_user_submit_response($newoptionid, $choice, $userid, $course, $cm);

        }

    }

    // Create the list of all options already selected by each user.

    $optionsbyuser = []; // Mapping userid=>array of chosen choice options.

    $usersbyanswer = []; // Mapping answerid=>userid (which answer belongs to each user).

    foreach ($allresponses as $optionid => $responses) {

        if ($optionid > 0) {

            foreach ($responses as $userid => $userresponse) {

                $optionsbyuser += [$userid => []];

                $optionsbyuser[$userid][] = $optionid;

                $usersbyanswer[$userresponse->answerid] = $userid;

            }

        }

    }

    // Go through the list of submitted attemptids and find which users answers need to be updated.

    foreach ($answerids as $answerid) {

        if (isset($usersbyanswer[$answerid])) {

            $userid = $usersbyanswer[$answerid];

            if (!in_array($newoptionid, $optionsbyuser[$userid])) {

                $options = $choice->allowmultiple ?

                        array_merge($optionsbyuser[$userid], [$newoptionid]) : $newoptionid;

                choice_user_submit_response($options, $choice, $userid, $course, $cm);

            }

        }

    }

}

/**

 * Process user submitted answers for a choice,

 * and either updating them or saving new answers.

 *

 * @param int|array $formanswer the id(s) of the user submitted choice options.

 * @param object $choice the selected choice.

 * @param int $userid user identifier.

 * @param object $course current course.

 * @param object $cm course context.

 * @return void

 */

function choice_user_submit_response($formanswer, $choice, $userid, $course, $cm) {

    global $DB, $CFG, $USER;

    require_once($CFG->libdir.'/completionlib.php');

    $continueurl = new moodle_url('/mod/choice/view.php', array('id' => $cm->id));

    if (empty($formanswer)) {

        throw new \moodle_exception('atleastoneoption', 'choice', $continueurl);

    }

    if (is_array($formanswer)) {

        if (!$choice->allowmultiple) {

            throw new \moodle_exception('multiplenotallowederror', 'choice', $continueurl);

        }

        $formanswers = $formanswer;

    } else {

        $formanswers = array($formanswer);

    }

    $options = $DB->get_records('choice_options', array('choiceid' => $choice->id), '', 'id');

    foreach ($formanswers as $key => $val) {

        if (!isset($options[$val])) {

            throw new \moodle_exception('cannotsubmit', 'choice', $continueurl);

        }

    }

    // Start lock to prevent synchronous access to the same data

    // before it's updated, if using limits.

    if ($choice->limitanswers) {

        $timeout = 10;

        $locktype = 'mod_choice_choice_user_submit_response';

        // Limiting access to this choice.

        $resouce = 'choiceid:' . $choice->id;

        $lockfactory = \core\lock\lock_config::get_lock_factory($locktype);

        // Opening the lock.

        $choicelock = $lockfactory->get_lock($resouce, $timeout, MINSECS);

        if (!$choicelock) {

            throw new \moodle_exception('cannotsubmit', 'choice', $continueurl);

        }

    }

    $current = $DB->get_records('choice_answers', array('choiceid' => $choice->id, 'userid' => $userid));

    // Array containing [answerid => optionid] mapping.

    $existinganswers = array_map(function($answer) {

        return $answer->optionid;

    }, $current);

    $context = context_module::instance($cm->id);

    $choicesexceeded = false;

    $countanswers = array();

    foreach ($formanswers as $val) {

        $countanswers[$val] = 0;

    }

    if($choice->limitanswers) {

        // Find out whether groups are being used and enabled

        if (groups_get_activity_groupmode($cm) > 0) {

            $currentgroup = groups_get_activity_group($cm);

        } else {

            $currentgroup = 0;

        }

        list ($insql, $params) = $DB->get_in_or_equal($formanswers, SQL_PARAMS_NAMED);

        if($currentgroup) {

            // If groups are being used, retrieve responses only for users in

            // current group

            global $CFG;

            $params['groupid'] = $currentgroup;

            $sql = "SELECT ca.*

                      FROM {choice_answers} ca

                INNER JOIN {groups_members} gm ON ca.userid=gm.userid

                     WHERE optionid $insql

                       AND gm.groupid= :groupid";

        } else {

            // Groups are not used, retrieve all answers for this option ID

            $sql = "SELECT ca.*

                      FROM {choice_answers} ca

                     WHERE optionid $insql";

        }

        $answers = $DB->get_records_sql($sql, $params);

        if ($answers) {

            foreach ($answers as $a) { //only return enrolled users.

                if (is_enrolled($context, $a->userid, 'mod/choice:choose')) {

                    $countanswers[$a->optionid]++;

                }

            }

        }

        foreach ($countanswers as $opt => $count) {

            // Ignore the user's existing answers when checking whether an answer count has been exceeded.

            // A user may wish to update their response with an additional choice option and shouldn't be competing with themself!

            if (in_array($opt, $existinganswers)) {

                continue;

            }

            if ($count >= $choice->maxanswers[$opt]) {

                $choicesexceeded = true;

                break;

            }

        }

    }

    // Check the user hasn't exceeded the maximum selections for the choice(s) they have selected.

    $answersnapshots = array();

    $deletedanswersnapshots = array();

    if (!($choice->limitanswers && $choicesexceeded)) {

        if ($current) {

            // Update an existing answer.

            foreach ($current as $c) {

                if (in_array($c->optionid, $formanswers)) {

                    $DB->set_field('choice_answers', 'timemodified', time(), array('id' => $c->id));

                } else {

                    $deletedanswersnapshots[] = $c;

                    $DB->delete_records('choice_answers', array('id' => $c->id));

                }

            }

            // Add new ones.

            foreach ($formanswers as $f) {

                if (!in_array($f, $existinganswers)) {

                    $newanswer = new stdClass();

                    $newanswer->optionid = $f;

                    $newanswer->choiceid = $choice->id;

                    $newanswer->userid = $userid;

                    $newanswer->timemodified = time();

                    $newanswer->id = $DB->insert_record("choice_answers", $newanswer);

                    $answersnapshots[] = $newanswer;

                }

            }

        } else {

            // Add new answer.

            foreach ($formanswers as $answer) {

                $newanswer = new stdClass();

                $newanswer->choiceid = $choice->id;

                $newanswer->userid = $userid;

                $newanswer->optionid = $answer;

                $newanswer->timemodified = time();

                $newanswer->id = $DB->insert_record("choice_answers", $newanswer);

                $answersnapshots[] = $newanswer;

            }

            // Update completion state

            $completion = new completion_info($course);

            if ($completion->is_enabled($cm) && $choice->completionsubmit) {

                $completion->update_state($cm, COMPLETION_COMPLETE);

            }

        }

    } else {

        // This is a choice with limited options, and one of the options selected has just run over its limit.

        $choicelock->release();

        throw new \moodle_exception('choicefull', 'choice', $continueurl);

    }

    // Release lock.

    if (isset($choicelock)) {

        $choicelock->release();

    }

    // Trigger events.

    foreach ($deletedanswersnapshots as $answer) {

        \mod_choice\event\answer_deleted::create_from_object($answer, $choice, $cm, $course)->trigger();

    }

    foreach ($answersnapshots as $answer) {

        \mod_choice\event\answer_created::create_from_object($answer, $choice, $cm, $course)->trigger();

    }

}

/**

 * @param array $user

 * @param object $cm

 * @return void Output is echo'd

 */

function choice_show_reportlink($user, $cm) {

    $userschosen = array();

    foreach($user as $optionid => $userlist) {

        if ($optionid) {

            $userschosen = array_merge($userschosen, array_keys($userlist));

        }

    }

    $responsecount = count(array_unique($userschosen));

    echo '<div class="reportlink">';

    echo "<a href=\"report.php?id=$cm->id\">".get_string("viewallresponses", "choice", $responsecount)."</a>";

    echo '</div>';

}

/**

 * @global object

 * @param object $choice

 * @param object $course

 * @param object $coursemodule

 * @param array $allresponses

 *  * @param bool $allresponses

 * @return object

 */

function prepare_choice_show_results($choice, $course, $cm, $allresponses) {

    global $OUTPUT;

    $display = clone($choice);

    $display->coursemoduleid = $cm->id;

    $display->courseid = $course->id;

    if (!empty($choice->showunanswered)) {

        $choice->option[0] = get_string('notanswered', 'choice');

        $choice->maxanswers[0] = 0;

    }

    // Remove from the list of non-respondents the users who do not have access to this activity.

    if (!empty($display->showunanswered) && $allresponses[0]) {

        $info = new \core_availability\info_module(cm_info::create($cm));

        $allresponses[0] = $info->filter_user_list($allresponses[0]);

    }

    //overwrite options value;

    $display->options = array();

    $allusers = [];

    foreach ($choice->option as $optionid => $optiontext) {

        $display->options[$optionid] = new stdClass;

        $display->options[$optionid]->text = format_string($optiontext, true,

            ['context' => context_module::instance($cm->id)]);

        $display->options[$optionid]->maxanswer = $choice->maxanswers[$optionid];

        if (array_key_exists($optionid, $allresponses)) {

            $display->options[$optionid]->user = $allresponses[$optionid];

            $allusers = array_merge($allusers, array_keys($allresponses[$optionid]));

        }

    }

    unset($display->option);

    unset($display->maxanswers);

    $display->numberofuser = count(array_unique($allusers));

    $context = context_module::instance($cm->id);

    $display->viewresponsecapability = has_capability('mod/choice:readresponses', $context);

    $display->deleterepsonsecapability = has_capability('mod/choice:deleteresponses',$context);

    $display->fullnamecapability = has_capability('moodle/site:viewfullnames', $context);

    if (empty($allresponses)) {

        echo $OUTPUT->heading(get_string("nousersyet"), 3, null);

        return false;

    }

    return $display;

}

/**

 * @global object

 * @param array $attemptids

 * @param object $choice Choice main table row

 * @param object $cm Course-module object

 * @param object $course Course object

 * @return bool

 */

function choice_delete_responses($attemptids, $choice, $cm, $course) {

    global $DB, $CFG, $USER;

    require_once($CFG->libdir.'/completionlib.php');

    if(!is_array($attemptids) || empty($attemptids)) {

        return false;

    }

    foreach($attemptids as $num => $attemptid) {

        if(empty($attemptid)) {

            unset($attemptids[$num]);

        }

    }

    $completion = new completion_info($course);

    foreach($attemptids as $attemptid) {

        if ($todelete = $DB->get_record('choice_answers', array('choiceid' => $choice->id, 'id' => $attemptid))) {

            // Trigger the event answer deleted.

            \mod_choice\event\answer_deleted::create_from_object($todelete, $choice, $cm, $course)->trigger();

            $DB->delete_records('choice_answers', array('choiceid' => $choice->id, 'id' => $attemptid));

        }

    }

    // Update completion state.

    if ($completion->is_enabled($cm) && $choice->completionsubmit) {

        $completion->update_state($cm, COMPLETION_INCOMPLETE);

    }

    return true;

}

/**

 * Given an ID of an instance of this module,

 * this function will permanently delete the instance

 * and any data that depends on it.

 *

 * @global object

 * @param int $id

 * @return bool

 */

function choice_delete_instance($id) {

    global $DB;

    if (! $choice = $DB->get_record("choice", array("id"=>"$id"))) {

        return false;

    }

    $result = true;

    if (! $DB->delete_records("choice_answers", array("choiceid"=>"$choice->id"))) {

        $result = false;

    }

    if (! $DB->delete_records("choice_options", array("choiceid"=>"$choice->id"))) {

        $result = false;

    }

    if (! $DB->delete_records("choice", array("id"=>"$choice->id"))) {

        $result = false;

    }

    // Remove old calendar events.

    if (! $DB->delete_records('event', array('modulename' => 'choice', 'instance' => $choice->id))) {

        $result = false;

    }

    return $result;

}

/**

 * Returns text string which is the answer that matches the id

 *

 * @global object

 * @param object $choice

 * @param int $id

 * @return string

 */

function choice_get_option_text($choice, $id) {

    global $DB;

    if ($result = $DB->get_record("choice_options", array("id" => $id))) {

        return $result->text;

    } else {

        return get_string("notanswered", "choice");

    }

}

/**

 * Gets a full choice record

 *

 * @global object

 * @param int $choiceid

 * @return object|bool The choice or false

 */

function choice_get_choice($choiceid) {

    global $DB;

    if ($choice = $DB->get_record("choice", array("id" => $choiceid))) {

        if ($options = $DB->get_records("choice_options", array("choiceid" => $choiceid), "id")) {

            foreach ($options as $option) {

                $choice->option[$option->id] = $option->text;

                $choice->maxanswers[$option->id] = $option->maxanswers;

            }

            return $choice;

        }

    }

    return false;

}

/**

 * List the actions that correspond to a view of this module.

 * This is used by the participation report.

 *

 * Note: This is not used by new logging system. Event with

 *       crud = 'r' and edulevel = LEVEL_PARTICIPATING will

 *       be considered as view action.

 *

 * @return array

 */

function choice_get_view_actions() {

    return array('view','view all','report');

}

/**

 * List the actions that correspond to a post of this module.

 * This is used by the participation report.

 *

 * Note: This is not used by new logging system. Event with

 *       crud = ('c' || 'u' || 'd') and edulevel = LEVEL_PARTICIPATING

 *       will be considered as post action.

 *

 * @return array

 */

function choice_get_post_actions() {

    return array('choose','choose again');

}

/**

 * Implementation of the function for printing the form elements that control

 * whether the course reset functionality affects the choice.

 *

 * @param MoodleQuickForm $mform form passed by reference

 */

function choice_reset_course_form_definition(&$mform) {

    $mform->addElement('header', 'choiceheader', get_string('modulenameplural', 'choice'));

    $mform->addElement('static', 'choicedelete', get_string('delete'));

    $mform->addElement('advcheckbox', 'reset_choice', get_string('removeresponses', 'choice'));

}

/**

 * Course reset form defaults.

 *

 * @return array

 */

function choice_reset_course_form_defaults($course) {

    return array('reset_choice'=>1);

}

/**

 * Actual implementation of the reset course functionality, delete all the

 * choice responses for course $data->courseid.

 *

 * @global object

 * @global object

 * @param object $data the data submitted from the reset course.

 * @return array status array

 */

function choice_reset_userdata($data) {

    global $CFG, $DB;

    $componentstr = get_string('modulenameplural', 'choice');

    $status = [];

    if (!empty($data->reset_choice)) {

        $choicessql = "SELECT ch.id

                       FROM {choice} ch

                       WHERE ch.course=?";

        $DB->delete_records_select('choice_answers', "choiceid IN ($choicessql)", [$data->courseid]);

        $status[] = [

            'component' => $componentstr,

            'item' => get_string('removeresponses', 'choice'),

            'error' => false,

        ];

    }

    // Updating dates - shift may be negative too.

    if ($data->timeshift) {

        // Any changes to the list of dates that needs to be rolled should be same during course restore and course reset.

        // See MDL-9367.

        shift_course_mod_dates('choice', ['timeopen', 'timeclose'], $data->timeshift, $data->courseid);

        $status[] = [

            'component' => $componentstr,

            'item' => get_string('date'),

            'error' => false,

        ];

    }

    return $status;

}

/**

 * Get response data for a choice and group.

 *

 * @global object

 * @global object

 * @global object

 * @uses CONTEXT_MODULE

 * @param object $choice

 * @param object $cm

 * @param int $groupmode

 * @param bool $onlyactive Whether to get response data for active users only.

 * @param int $groupid Group id, null for current group if choice has groups.

 * @return array

 */

function choice_get_response_data($choice, $cm, $groupmode, $onlyactive, ?int $groupid = null) {

    global $CFG, $USER, $DB;

    $context = context_module::instance($cm->id);

    if ($groupmode > 0) {

        if (is_null($groupid)) {

            // Get the current group.

            $groupid = groups_get_activity_group($cm);

        }

    } else {

        $groupid = 0;

    }

/// Initialise the returned array, which is a matrix:  $allresponses[responseid][userid] = responseobject

    $allresponses = array();

/// First get all the users who have access here

/// To start with we assume they are all "unanswered" then move them later

    // TODO Does not support custom user profile fields (MDL-70456).

    $userfieldsapi = \core_user\fields::for_identity($context, false)->with_userpic();

    $userfields = $userfieldsapi->get_sql('u', false, '', '', false)->selects;

    $allresponses[0] = get_enrolled_users($context, 'mod/choice:choose', $groupid,

            $userfields, null, 0, 0, $onlyactive);

/// Get all the recorded responses for this choice

    $rawresponses = $DB->get_records('choice_answers', array('choiceid' => $choice->id));

/// Use the responses to move users into the correct column

    if ($rawresponses) {

        $answeredusers = array();

        foreach ($rawresponses as $response) {

            if (isset($allresponses[0][$response->userid])) {   // This person is enrolled and in correct group

                $allresponses[0][$response->userid]->timemodified = $response->timemodified;

                $allresponses[$response->optionid][$response->userid] = clone($allresponses[0][$response->userid]);

                $allresponses[$response->optionid][$response->userid]->answerid = $response->id;

                $answeredusers[] = $response->userid;

            }

        }

        foreach ($answeredusers as $answereduser) {

            unset($allresponses[0][$answereduser]);

        }

    }

    return $allresponses;

}

/**

 * @uses FEATURE_GROUPS

 * @uses FEATURE_GROUPINGS

 * @uses FEATURE_MOD_INTRO

 * @uses FEATURE_COMPLETION_TRACKS_VIEWS

 * @uses FEATURE_GRADE_HAS_GRADE

 * @uses FEATURE_GRADE_OUTCOMES

 * @param string $feature FEATURE_xx constant for requested feature

 * @return mixed True if module supports feature, false if not, null if doesn't know or string for the module purpose.

 */

function choice_supports($feature) {

    switch($feature) {

        case FEATURE_GROUPS:                  return true;

        case FEATURE_GROUPINGS:               return true;

        case FEATURE_MOD_INTRO:               return true;

        case FEATURE_COMPLETION_TRACKS_VIEWS: return true;

        case FEATURE_COMPLETION_HAS_RULES:    return true;

        case FEATURE_GRADE_HAS_GRADE:         return false;

        case FEATURE_GRADE_OUTCOMES:          return false;

        case FEATURE_BACKUP_MOODLE2:          return true;

        case FEATURE_SHOW_DESCRIPTION:        return true;

        case FEATURE_MOD_PURPOSE:             return MOD_PURPOSE_COMMUNICATION;

        default: return null;

    }

}

/**

 * Adds module specific settings to the settings block

 *

 * @param settings_navigation $settings The settings navigation object

 * @param navigation_node $choicenode The node to add module settings to

 */

function choice_extend_settings_navigation(settings_navigation $settings, navigation_node $choicenode) {

    if (has_capability('mod/choice:readresponses', $settings->get_page()->cm->context)) {

        $choicenode->add(get_string('responses', 'choice'),

            new moodle_url('/mod/choice/report.php', array('id' => $settings->get_page()->cm->id)));

    }

}

/**

 * Return a list of page types

 * @param string $pagetype current page type

 * @param stdClass $parentcontext Block's parent context

 * @param stdClass $currentcontext Current context of block

 */

function choice_page_type_list($pagetype, $parentcontext, $currentcontext) {

    $module_pagetype = array('mod-choice-*'=>get_string('page-mod-choice-x', 'choice'));

    return $module_pagetype;

}

/**

 * Get responses of a given user on a given choice.

 *

 * @param stdClass $choice Choice record

 * @param int $userid User id

 * @return array of choice answers records

 * @since  Moodle 3.6

 */

function choice_get_user_response($choice, $userid) {

    global $DB;

    return $DB->get_records('choice_answers', array('choiceid' => $choice->id, 'userid' => $userid), 'optionid');

}

/**

 * Get my responses on a given choice.

 *

 * @param stdClass $choice Choice record

 * @return array of choice answers records

 * @since  Moodle 3.0

 */

function choice_get_my_response($choice) {

    global $USER;

    return choice_get_user_response($choice, $USER->id);

}

/**

 * Get all the responses on a given choice.

 *

 * @param stdClass $choice Choice record

 * @return array of choice answers records

 * @since  Moodle 3.0

 */

function choice_get_all_responses($choice) {

    global $DB;

    return $DB->get_records('choice_answers', array('choiceid' => $choice->id));

}

/**

 * Return true if we are allowd to view the choice results.

 *

 * @param stdClass $choice Choice record

 * @param rows|null $current my choice responses

 * @param bool|null $choiceopen if the choice is open

 * @return bool true if we can view the results, false otherwise.

 * @since  Moodle 3.0

 */

function choice_can_view_results($choice, $current = null, $choiceopen = null) {

    if (is_null($choiceopen)) {

        $timenow = time();

        if ($choice->timeopen != 0 && $timenow < $choice->timeopen) {

            // If the choice is not available, we can't see the results.

            return false;

        }

        if ($choice->timeclose != 0 && $timenow > $choice->timeclose) {

            $choiceopen = false;

        } else {

            $choiceopen = true;

        }

    }

    if (empty($current)) {

        $current = choice_get_my_response($choice);

    }

    if ($choice->showresults == CHOICE_SHOWRESULTS_ALWAYS or

       ($choice->showresults == CHOICE_SHOWRESULTS_AFTER_ANSWER and !empty($current)) or

       ($choice->showresults == CHOICE_SHOWRESULTS_AFTER_CLOSE and !$choiceopen)) {

        return true;

    }

    return false;

}

/**

 * Mark the activity completed (if required) and trigger the course_module_viewed event.

 *

 * @param  stdClass $choice     choice object

 * @param  stdClass $course     course object

 * @param  stdClass $cm         course module object

 * @param  stdClass $context    context object

 * @since Moodle 3.0

 */

function choice_view($choice, $course, $cm, $context) {

    // Trigger course_module_viewed event.

    $params = array(

        'context' => $context,

        'objectid' => $choice->id

    );

    $event = \mod_choice\event\course_module_viewed::create($params);

    $event->add_record_snapshot('course_modules', $cm);

    $event->add_record_snapshot('course', $course);

    $event->add_record_snapshot('choice', $choice);

    $event->trigger();

    // Completion.

    $completion = new completion_info($course);

    $completion->set_module_viewed($cm);

}

/**

 * Check if a choice is available for the current user.

 *

 * @param  stdClass  $choice            choice record

 * @return array                       status (available or not and possible warnings)

 */

function choice_get_availability_status($choice) {

    $available = true;

    $warnings = array();

    $timenow = time();

    if (!empty($choice->timeopen) && ($choice->timeopen > $timenow)) {

        $available = false;

        $warnings['notopenyet'] = userdate($choice->timeopen);

    } else if (!empty($choice->timeclose) && ($timenow > $choice->timeclose)) {

        $available = false;

        $warnings['expired'] = userdate($choice->timeclose);

    }

    if (!$choice->allowupdate && choice_get_my_response($choice)) {