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655 lines
26 KiB
655 lines
26 KiB
<?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 class for loading and preparing grade data from import.
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*
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* @package gradeimport_csv
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* @copyright 2014 Adrian Greeve <adrian@moodle.com>
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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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defined('MOODLE_INTERNAL') || die();
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/**
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* A class for loading and preparing grade data from import.
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*
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* @package gradeimport_csv
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* @copyright 2014 Adrian Greeve <adrian@moodle.com>
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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 gradeimport_csv_load_data {
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/** @var string $error csv import error. */
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protected $error;
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/** @var int $iid Unique identifier for these csv records. */
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protected $iid;
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/** @var array $headers Column names for the data. */
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protected $headers;
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/** @var array $previewdata A subsection of the csv imported data. */
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protected $previewdata;
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// The map_user_data_with_value variables.
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/** @var array $newgrades Grades to be inserted into the gradebook. */
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protected $newgrades;
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/** @var array $newfeedbacks Feedback to be inserted into the gradebook. */
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protected $newfeedbacks;
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/** @var int $studentid Student ID*/
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protected $studentid;
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// The prepare_import_grade_data() variables.
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/** @var bool $status The current status of the import. True = okay, False = errors. */
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protected $status;
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/** @var int $importcode The code for this batch insert. */
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protected $importcode;
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/** @var array $gradebookerrors An array of errors from trying to import into the gradebook. */
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protected $gradebookerrors;
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/** @var array $newgradeitems An array of new grade items to be inserted into the gradebook. */
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protected $newgradeitems;
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/**
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* Load CSV content for previewing.
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*
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* @param string $text The grade data being imported.
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* @param string $encoding The type of encoding the file uses.
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* @param string $separator The separator being used to define each field.
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* @param int $previewrows How many rows are being previewed.
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*/
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public function load_csv_content($text, $encoding, $separator, $previewrows) {
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$this->raise_limits();
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$this->iid = csv_import_reader::get_new_iid('grade');
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$csvimport = new csv_import_reader($this->iid, 'grade');
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$csvimport->load_csv_content($text, $encoding, $separator);
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$this->error = $csvimport->get_error();
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// If there are no import errors then proceed.
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if (empty($this->error)) {
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// Get header (field names).
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$this->headers = $csvimport->get_columns();
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$this->trim_headers();
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$csvimport->init();
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$this->previewdata = array();
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for ($numlines = 0; $numlines <= $previewrows; $numlines++) {
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$lines = $csvimport->next();
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if ($lines) {
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$this->previewdata[] = $lines;
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}
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}
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}
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}
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/**
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* Gets all of the grade items in this course.
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*
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* @param int $courseid Course id;
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* @return array An array of grade items for the course.
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*/
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public static function fetch_grade_items($courseid) {
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$gradeitems = null;
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if ($allgradeitems = grade_item::fetch_all(array('courseid' => $courseid))) {
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foreach ($allgradeitems as $gradeitem) {
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// Skip course type and category type.
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if ($gradeitem->itemtype == 'course' || $gradeitem->itemtype == 'category') {
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continue;
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}
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$displaystring = null;
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if (!empty($gradeitem->itemmodule)) {
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$displaystring = get_string('modulename', $gradeitem->itemmodule).get_string('labelsep', 'langconfig')
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.$gradeitem->get_name();
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} else {
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$displaystring = $gradeitem->get_name();
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}
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$gradeitems[$gradeitem->id] = $displaystring;
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}
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}
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return $gradeitems;
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}
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/**
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* Cleans the column headers from the CSV file.
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*/
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protected function trim_headers() {
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foreach ($this->headers as $i => $h) {
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$h = trim($h); // Remove whitespace.
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$h = clean_param($h, PARAM_RAW); // Clean the header.
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$this->headers[$i] = $h;
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}
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}
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/**
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* Raises the php execution time and memory limits for importing the CSV file.
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*/
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protected function raise_limits() {
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// Large files are likely to take their time and memory. Let PHP know
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// that we'll take longer, and that the process should be recycled soon
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// to free up memory.
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core_php_time_limit::raise();
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raise_memory_limit(MEMORY_EXTRA);
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}
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/**
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* Inserts a record into the grade_import_values table. This also adds common record information.
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*
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* @param object $record The grade record being inserted into the database.
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* @param int $studentid The student ID.
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* @return bool|int true or insert id on success. Null if the grade value is too high.
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*/
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protected function insert_grade_record($record, $studentid) {
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global $DB, $USER, $CFG;
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$record->importcode = $this->importcode;
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$record->userid = $studentid;
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$record->importer = $USER->id;
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// By default the maximum grade is 100.
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$gradepointmaximum = 100;
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// If the grade limit has been increased then use the gradepointmax setting.
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if ($CFG->unlimitedgrades) {
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$gradepointmaximum = $CFG->gradepointmax;
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}
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// If the record final grade is set then check that the grade value isn't too high.
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// Final grade will not be set if we are inserting feedback.
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if (!isset($record->finalgrade) || $record->finalgrade <= $gradepointmaximum) {
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return $DB->insert_record('grade_import_values', $record);
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} else {
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$this->cleanup_import(get_string('gradevaluetoobig', 'grades', $gradepointmaximum));
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return null;
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}
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}
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/**
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* Insert the new grade into the grade item buffer table.
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*
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* @param array $header The column headers from the CSV file.
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* @param int $key Current row identifier.
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* @param string $value The value for this row (final grade).
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* @return stdClass new grade that is ready for commiting to the gradebook.
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*/
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protected function import_new_grade_item($header, $key, $value) {
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global $DB, $USER;
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// First check if header is already in temp database.
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if (empty($this->newgradeitems[$key])) {
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$newgradeitem = new stdClass();
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$newgradeitem->itemname = $header[$key];
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$newgradeitem->importcode = $this->importcode;
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$newgradeitem->importer = $USER->id;
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// Insert into new grade item buffer.
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$this->newgradeitems[$key] = $DB->insert_record('grade_import_newitem', $newgradeitem);
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}
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$newgrade = new stdClass();
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$newgrade->newgradeitem = $this->newgradeitems[$key];
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$trimmed = trim($value);
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if ($trimmed === '' or $trimmed == '-') {
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// Blank or dash grade means null, ie "no grade".
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$newgrade->finalgrade = null;
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} else {
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// We have an actual grade.
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$newgrade->finalgrade = $value;
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}
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$this->newgrades[] = $newgrade;
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return $newgrade;
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}
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/**
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* Check that the user is in the system.
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*
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* @param string $value The value, from the csv file, being mapped to identify the user.
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* @param array $userfields Contains the field and label being mapped from.
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* @return int Returns the user ID if it exists, otherwise null.
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*/
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protected function check_user_exists($value, $userfields) {
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global $DB;
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$user = null;
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$errorkey = false;
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// The user may use the incorrect field to match the user. This could result in an exception.
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try {
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$field = $userfields['field'];
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// Fields that can be queried in a case-insensitive manner.
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$caseinsensitivefields = [
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'email',
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'username',
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];
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// Build query predicate.
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if (in_array($field, $caseinsensitivefields)) {
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// Case-insensitive.
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$select = $DB->sql_equal($field, ':' . $field, false);
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} else {
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// Exact-value.
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$select = "{$field} = :{$field}";
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}
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// Make sure the record exists and that there's only one matching record found.
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$user = $DB->get_record_select('user', $select, array($userfields['field'] => $value), '*', MUST_EXIST);
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} catch (dml_missing_record_exception $missingex) {
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$errorkey = 'usermappingerror';
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} catch (dml_multiple_records_exception $multiex) {
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$errorkey = 'usermappingerrormultipleusersfound';
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}
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// Field may be fine, but no records were returned.
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if ($errorkey) {
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$usermappingerrorobj = new stdClass();
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$usermappingerrorobj->field = $userfields['label'];
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$usermappingerrorobj->value = $value;
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$this->cleanup_import(get_string($errorkey, 'grades', $usermappingerrorobj));
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unset($usermappingerrorobj);
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return null;
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}
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return $user->id;
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}
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/**
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* Check to see if the feedback matches a grade item.
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*
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* @param int $courseid The course ID.
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* @param int $itemid The ID of the grade item that the feedback relates to.
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* @param string $value The actual feedback being imported.
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* @return object Creates a feedback object with the item ID and the feedback value.
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*/
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protected function create_feedback($courseid, $itemid, $value) {
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// Case of an id, only maps id of a grade_item.
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// This was idnumber.
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if (!new grade_item(array('id' => $itemid, 'courseid' => $courseid))) {
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// Supplied bad mapping, should not be possible since user
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// had to pick mapping.
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$this->cleanup_import(get_string('importfailed', 'grades'));
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return null;
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}
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// The itemid is the id of the grade item.
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$feedback = new stdClass();
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$feedback->itemid = $itemid;
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$feedback->feedback = $value;
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return $feedback;
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}
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/**
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* This updates existing grade items.
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*
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* @param int $courseid The course ID.
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* @param array $map Mapping information provided by the user.
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* @param int $key The line that we are currently working on.
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* @param bool $verbosescales Form setting for grading with scales.
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* @param string $value The grade value.
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* @return array grades to be updated.
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*/
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protected function update_grade_item($courseid, $map, $key, $verbosescales, $value) {
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// Case of an id, only maps id of a grade_item.
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// This was idnumber.
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if (!$gradeitem = new grade_item(array('id' => $map[$key], 'courseid' => $courseid))) {
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// Supplied bad mapping, should not be possible since user
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// had to pick mapping.
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$this->cleanup_import(get_string('importfailed', 'grades'));
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return null;
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}
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// Check if grade item is locked if so, abort.
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if ($gradeitem->is_locked()) {
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$this->cleanup_import(get_string('gradeitemlocked', 'grades'));
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return null;
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}
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$newgrade = new stdClass();
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$newgrade->itemid = $gradeitem->id;
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if ($gradeitem->gradetype == GRADE_TYPE_SCALE and $verbosescales) {
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if ($value === '' or $value == '-') {
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$value = null; // No grade.
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} else {
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$scale = $gradeitem->load_scale();
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$scales = explode(',', $scale->scale);
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$scales = array_map('trim', $scales); // Hack - trim whitespace around scale options.
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array_unshift($scales, '-'); // Scales start at key 1.
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$key = array_search($value, $scales);
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if ($key === false) {
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$this->cleanup_import(get_string('badgrade', 'grades'));
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return null;
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}
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$value = $key;
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}
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$newgrade->finalgrade = $value;
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} else {
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if ($value === '' or $value == '-') {
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$value = null; // No grade.
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} else {
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// If the value has a local decimal or can correctly be unformatted, do it.
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$validvalue = unformat_float($value, true);
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if ($validvalue !== false) {
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$value = $validvalue;
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} else {
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// Non numeric grade value supplied, possibly mapped wrong column.
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$this->cleanup_import(get_string('badgrade', 'grades'));
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return null;
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}
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}
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$newgrade->finalgrade = $value;
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}
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$this->newgrades[] = $newgrade;
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return $this->newgrades;
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}
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/**
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* Clean up failed CSV grade import. Clears the temp table for inserting grades.
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*
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* @param string $notification The error message to display from the unsuccessful grade import.
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*/
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protected function cleanup_import($notification) {
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$this->status = false;
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import_cleanup($this->importcode);
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$this->gradebookerrors[] = $notification;
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}
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/**
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* Check user mapping.
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*
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* @param string $mappingidentifier The user field that we are matching together.
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* @param string $value The value we are checking / importing.
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* @param array $header The column headers of the csv file.
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* @param array $map Mapping information provided by the user.
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* @param int $key Current row identifier.
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* @param int $courseid The course ID.
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* @param int $feedbackgradeid The ID of the grade item that the feedback relates to.
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* @param bool $verbosescales Form setting for grading with scales.
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*/
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protected function map_user_data_with_value($mappingidentifier, $value, $header, $map, $key, $courseid, $feedbackgradeid,
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$verbosescales) {
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// Fields that the user can be mapped from.
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$userfields = array(
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'userid' => array(
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'field' => 'id',
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'label' => 'id',
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),
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'useridnumber' => array(
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'field' => 'idnumber',
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'label' => 'idnumber',
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),
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'useremail' => array(
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'field' => 'email',
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'label' => 'email address',
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),
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'username' => array(
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'field' => 'username',
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'label' => 'username',
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),
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);
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switch ($mappingidentifier) {
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case 'userid':
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case 'useridnumber':
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case 'useremail':
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case 'username':
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// Skip invalid row with blank user field.
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if (!empty($value)) {
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$this->studentid = $this->check_user_exists($value, $userfields[$mappingidentifier]);
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}
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break;
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case 'new':
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$this->import_new_grade_item($header, $key, $value);
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break;
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case 'feedback':
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if ($feedbackgradeid) {
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$feedback = $this->create_feedback($courseid, $feedbackgradeid, $value);
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if (isset($feedback)) {
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$this->newfeedbacks[] = $feedback;
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}
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}
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break;
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default:
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// Existing grade items.
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if (!empty($map[$key])) {
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$this->newgrades = $this->update_grade_item($courseid, $map, $key, $verbosescales, $value,
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$mappingidentifier);
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}
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// Otherwise, we ignore this column altogether because user has chosen
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// to ignore them (e.g. institution, address etc).
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break;
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}
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}
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/**
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* Checks and prepares grade data for inserting into the gradebook.
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*
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* @param array $header Column headers of the CSV file.
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* @param object $formdata Mapping information from the preview page.
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* @param object $csvimport csv import reader object for iterating over the imported CSV file.
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* @param int $courseid The course ID.
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* @param bool $separatemode If we have groups are they separate?
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* @param mixed $currentgroup current group information.
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* @param bool $verbosescales Form setting for grading with scales.
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* @return bool True if the status for importing is okay, false if there are errors.
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*/
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public function prepare_import_grade_data($header, $formdata, $csvimport, $courseid, $separatemode, $currentgroup,
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$verbosescales) {
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global $DB, $USER;
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// The import code is used for inserting data into the grade tables.
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$this->importcode = $formdata->importcode;
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$this->status = true;
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$this->headers = $header;
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$this->studentid = null;
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$this->gradebookerrors = null;
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$forceimport = $formdata->forceimport;
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// Temporary array to keep track of what new headers are processed.
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$this->newgradeitems = array();
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$this->trim_headers();
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$timeexportkey = null;
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$map = array();
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// Loops mapping_0, mapping_1 .. mapping_n and construct $map array.
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foreach ($header as $i => $head) {
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if (isset($formdata->{'mapping_'.$i})) {
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$map[$i] = $formdata->{'mapping_'.$i};
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}
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if ($head == get_string('timeexported', 'gradeexport_txt')) {
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$timeexportkey = $i;
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}
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}
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// If mapping information is supplied.
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$map[clean_param($formdata->mapfrom, PARAM_RAW)] = clean_param($formdata->mapto, PARAM_RAW);
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// Check for mapto collisions.
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$maperrors = array();
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foreach ($map as $i => $j) {
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if ($j == 0) {
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// You can have multiple ignores.
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continue;
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} else {
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if (!isset($maperrors[$j])) {
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$maperrors[$j] = true;
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} else {
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// Collision.
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print_error('cannotmapfield', '', '', $j);
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}
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}
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}
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$this->raise_limits();
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$csvimport->init();
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while ($line = $csvimport->next()) {
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if (count($line) <= 1) {
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// There is no data on this line, move on.
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continue;
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}
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// Array to hold all grades to be inserted.
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$this->newgrades = array();
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// Array to hold all feedback.
|
|
$this->newfeedbacks = array();
|
|
// Each line is a student record.
|
|
foreach ($line as $key => $value) {
|
|
|
|
$value = clean_param($value, PARAM_RAW);
|
|
$value = trim($value);
|
|
|
|
/*
|
|
* the options are
|
|
* 1) userid, useridnumber, usermail, username - used to identify user row
|
|
* 2) new - new grade item
|
|
* 3) id - id of the old grade item to map onto
|
|
* 3) feedback_id - feedback for grade item id
|
|
*/
|
|
|
|
// Explode the mapping for feedback into a label 'feedback' and the identifying number.
|
|
$mappingbase = explode("_", $map[$key]);
|
|
$mappingidentifier = $mappingbase[0];
|
|
// Set the feedback identifier if it exists.
|
|
if (isset($mappingbase[1])) {
|
|
$feedbackgradeid = (int)$mappingbase[1];
|
|
} else {
|
|
$feedbackgradeid = '';
|
|
}
|
|
|
|
$this->map_user_data_with_value($mappingidentifier, $value, $header, $map, $key, $courseid, $feedbackgradeid,
|
|
$verbosescales);
|
|
if ($this->status === false) {
|
|
return $this->status;
|
|
}
|
|
}
|
|
|
|
// No user mapping supplied at all, or user mapping failed.
|
|
if (empty($this->studentid) || !is_numeric($this->studentid)) {
|
|
// User not found, abort whole import.
|
|
$this->cleanup_import(get_string('usermappingerrorusernotfound', 'grades'));
|
|
break;
|
|
}
|
|
|
|
if ($separatemode and !groups_is_member($currentgroup, $this->studentid)) {
|
|
// Not allowed to import into this group, abort.
|
|
$this->cleanup_import(get_string('usermappingerrorcurrentgroup', 'grades'));
|
|
break;
|
|
}
|
|
|
|
// Insert results of this students into buffer.
|
|
if ($this->status and !empty($this->newgrades)) {
|
|
|
|
foreach ($this->newgrades as $newgrade) {
|
|
|
|
// Check if grade_grade is locked and if so, abort.
|
|
if (!empty($newgrade->itemid) and $gradegrade = new grade_grade(array('itemid' => $newgrade->itemid,
|
|
'userid' => $this->studentid))) {
|
|
if ($gradegrade->is_locked()) {
|
|
// Individual grade locked.
|
|
$this->cleanup_import(get_string('gradelocked', 'grades'));
|
|
return $this->status;
|
|
}
|
|
// Check if the force import option is disabled and the last exported date column is present.
|
|
if (!$forceimport && !empty($timeexportkey)) {
|
|
$exportedtime = $line[$timeexportkey];
|
|
if (clean_param($exportedtime, PARAM_INT) != $exportedtime || $exportedtime > time() ||
|
|
$exportedtime < strtotime("-1 year", time())) {
|
|
// The date is invalid, or in the future, or more than a year old.
|
|
$this->cleanup_import(get_string('invalidgradeexporteddate', 'grades'));
|
|
return $this->status;
|
|
|
|
}
|
|
$timemodified = $gradegrade->get_dategraded();
|
|
if (!empty($timemodified) && ($exportedtime < $timemodified)) {
|
|
// The item was graded after we exported it, we return here not to override it.
|
|
$user = core_user::get_user($this->studentid);
|
|
$this->cleanup_import(get_string('gradealreadyupdated', 'grades', fullname($user)));
|
|
return $this->status;
|
|
}
|
|
}
|
|
}
|
|
$insertid = self::insert_grade_record($newgrade, $this->studentid);
|
|
// Check to see if the insert was successful.
|
|
if (empty($insertid)) {
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Updating/inserting all comments here.
|
|
if ($this->status and !empty($this->newfeedbacks)) {
|
|
foreach ($this->newfeedbacks as $newfeedback) {
|
|
$sql = "SELECT *
|
|
FROM {grade_import_values}
|
|
WHERE importcode=? AND userid=? AND itemid=? AND importer=?";
|
|
if ($feedback = $DB->get_record_sql($sql, array($this->importcode, $this->studentid, $newfeedback->itemid,
|
|
$USER->id))) {
|
|
$newfeedback->id = $feedback->id;
|
|
$DB->update_record('grade_import_values', $newfeedback);
|
|
|
|
} else {
|
|
// The grade item for this is not updated.
|
|
$newfeedback->importonlyfeedback = true;
|
|
$insertid = self::insert_grade_record($newfeedback, $this->studentid);
|
|
// Check to see if the insert was successful.
|
|
if (empty($insertid)) {
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return $this->status;
|
|
}
|
|
|
|
/**
|
|
* Returns the headers parameter for this class.
|
|
*
|
|
* @return array returns headers parameter for this class.
|
|
*/
|
|
public function get_headers() {
|
|
return $this->headers;
|
|
}
|
|
|
|
/**
|
|
* Returns the error parameter for this class.
|
|
*
|
|
* @return string returns error parameter for this class.
|
|
*/
|
|
public function get_error() {
|
|
return $this->error;
|
|
}
|
|
|
|
/**
|
|
* Returns the iid parameter for this class.
|
|
*
|
|
* @return int returns iid parameter for this class.
|
|
*/
|
|
public function get_iid() {
|
|
return $this->iid;
|
|
}
|
|
|
|
/**
|
|
* Returns the preview_data parameter for this class.
|
|
*
|
|
* @return array returns previewdata parameter for this class.
|
|
*/
|
|
public function get_previewdata() {
|
|
return $this->previewdata;
|
|
}
|
|
|
|
/**
|
|
* Returns the gradebookerrors parameter for this class.
|
|
*
|
|
* @return array returns gradebookerrors parameter for this class.
|
|
*/
|
|
public function get_gradebookerrors() {
|
|
return $this->gradebookerrors;
|
|
}
|
|
}
|
|
|