root
74 lines
2.3 KiB
PHP
74 lines
2.3 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Database\Migrations;
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use CodeIgniter\Database\Migration;
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use RuntimeException;
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final class EnsureWhatsappGroupLinksUniquePerSchoolYear extends Migration
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{
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public function up(): void
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{
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if ($this->db->DBDriver !== 'MySQLi') {
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throw new RuntimeException('This migration requires MySQL/MariaDB through the MySQLi driver.');
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}
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if (! $this->db->tableExists('whatsapp_group_links')
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|| ! $this->db->fieldExists('class_section_id', 'whatsapp_group_links')
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|| ! $this->db->fieldExists('school_year', 'whatsapp_group_links')) {
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return;
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}
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$duplicates = $this->db->query(
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'SELECT class_section_id, school_year, COUNT(*) AS row_count
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FROM `whatsapp_group_links`
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GROUP BY class_section_id, school_year
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HAVING COUNT(*) > 1
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LIMIT 5'
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)->getResultArray();
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if ($duplicates !== []) {
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throw new RuntimeException(
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'Cannot add whatsapp_group_links unique key by school year because duplicate class_section_id/school_year rows exist: '
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. json_encode($duplicates)
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);
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}
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$this->dropIndexIfExists('whatsapp_group_links', 'uq_section_term');
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$this->db->query(
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'ALTER TABLE `whatsapp_group_links`
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ADD UNIQUE INDEX `uq_section_term` (`class_section_id`, `school_year`)'
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);
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}
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public function down(): void
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{
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throw new RuntimeException('This migration is intentionally irreversible because reverting can fail once multiple school years exist for the same section.');
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}
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private function dropIndexIfExists(string $table, string $index): void
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{
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$exists = $this->db->query(
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'SELECT COUNT(*) AS aggregate
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FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = ?
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AND INDEX_NAME = ?',
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[$table, $index]
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)->getRow();
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if ((int) ($exists->aggregate ?? 0) === 0) {
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return;
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}
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$this->db->query(sprintf(
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'ALTER TABLE `%s` DROP INDEX `%s`',
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str_replace('`', '``', $table),
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str_replace('`', '``', $index)
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));
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}
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}
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