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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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 * Custom sort order upgrade script.
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 *
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 * @package   qbank_columnsortorder
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 * @copyright 2024 The Open University
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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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use core_question\local\bank\column_base;
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/**
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 * Upgrade the plugin.
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 *
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 * @param int $oldversion the version of this plugin we are upgrading from.
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 * @return bool success/failure.
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 */
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function xmldb_qbank_columnsortorder_upgrade(int $oldversion): bool {
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    global $DB;
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    if ($oldversion < 2024042201) {
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        // Before Moodle 4.3, config_plugins settings for qbank_columnsortorder (disabledcol, enabledcol) had a value like
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        // qbank_statistics\columns\facility_index,qbank_statistics\columns\discriminative_efficiency, ...
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        // In Moodle 4.3, the values are stored as qbank_statistics\columns\discriminative_efficiency-discriminative_efficiency.
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        // So updating the old values to match the new format.
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        // Update the columns records for qbank_columnsortorder plugin.
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        $pluginconfigs = $DB->get_records('config_plugins', ['plugin' => 'qbank_columnsortorder'], 'name, value');
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        foreach ($pluginconfigs as $config) {
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            if ($config->name == 'version') {
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                continue;
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            }
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            $fields = explode(',', $config->value);
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            $updatedcols = [];
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            foreach ($fields as $columnclass) {
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                // Columns config that are already in the correct format, could be ignored.
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                if (str_contains($columnclass, column_base::ID_SEPARATOR)) {
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                    continue;
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                }
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                $classbits = explode('\\', $columnclass);
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                $columnname = end($classbits);
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                // The custom fields are to be in the format e.g., qbank_customfields\custom_field_column-test.
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                if (str_contains($columnclass, 'custom_field_column')) {
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                    array_pop($classbits);
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                }
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                $updatedcols[] = implode('\\', $classbits) . column_base::ID_SEPARATOR . $columnname;
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            }
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            $updatedconfig = implode(',', $updatedcols);
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            set_config($config->name, $updatedconfig, 'qbank_columnsortorder');
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        }
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        // Custom sort order savepoint reached.
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        upgrade_plugin_savepoint(true, 2024042201, 'qbank', 'columnsortorder');
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    }
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    if ($oldversion < 2024042202) {
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        // Remove plugin entry created by previously incorrect 2024042201 savepoint.
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        $DB->delete_records('config_plugins', ['plugin' => 'qbank_qbank_columnsortorder']);
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        upgrade_plugin_savepoint(true, 2024042202, 'qbank', 'columnsortorder');
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    }
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    return true;
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}