freescout-restricted-customers/Database/Migrations/2024_07_10_162728_relax_unicity_of_customer_emails.php

<?php
/*
 SPDX-License-Identifier: AGPL-3.0-only
 SPDX-FileCopyrightText: © 2024 Millions Missing FRANCE <info@millionsmissing.fr>
 */

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class RelaxUnicityOfCustomerEmails extends Migration {
	/**
	 * Run the migrations.
	 *
	 * @return void
	 */
	public function up() {
		Schema::table('emails', function (Blueprint $table) {
			// Ensure a same e-mail can only be set once for a given Customer.
			$table->unique(['email', 'customer_id']);
			// Allow a same e-mail to be set to multiple Customers.
			$table->dropUnique(['email']);
		});
	}

	/**
	 * Reverse the migrations.
	 *
	 * @return void
	 */
	public function down() {
		Schema::table('emails', function (Blueprint $table) {
			// TODO: Remove all duplicated e-mails.
			// Restore the unicity of e-mails.
			$table->unique('email');
			// Drop the redundant unicity constraint.
			$table->dropUnique(['email', 'customer_id']);
		});
	}
}