Laravel - Create Index If Not Exists / Drop Index If Exists

laravel_conditional_index_migration.php

<?php

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

class LaravelConditionalIndexMigration extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {

        Schema::table('tablename', function (Blueprint $table) {
            $sm = Schema::getConnection()->getDoctrineSchemaManager();
            $doctrineTable = $sm->listTableDetails('tablename');

            if (! $doctrineTable->hasIndex('singlecolumnindexname')) {
                $table->index('column1', 'singlecolumnindexname');
            }
                      
            if (! $doctrineTable->hasIndex('multicolumnindexname')) {
                $table->index(['column2', 'column3'], 'multicolumnindexname');
            }
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {

        Schema::table('tablename', function (Blueprint $table) {
            $sm = Schema::getConnection()->getDoctrineSchemaManager();
            $doctrineTable = $sm->listTableDetails('tablename');

            if ($doctrineTable->hasIndex('singlecolumnindexname')) {
                $table->dropIndex('singlecolumnindexname');
            }
            if ($doctrineTable->hasIndex('multicolumnindexname')) {
                $table->dropIndex('multicolumnindexname');
            }
        });

    }
}

I'm glad I found this, because that's exactly what I was looking for! Thanks for the comments!
I made a portable/reuseable solution for it (app/Domain/Migration/MigrationUtil.php):

<?php

declare(strict_types=1);

namespace App\Domain\Migration;

use Doctrine\DBAL\Exception;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

class MigrationUtil
{
    /**
     * INFO: https://gist.github.com/Razoxane/3bc74900b4eb5c983eb0927fa13b95f5
     *
     * @throws Exception
     */
    public static function hasIndex(string $tableName, string $indexName): bool
    {
        $doctrineSchemaManager = Schema::getConnection()->getDoctrineSchemaManager();

        return $doctrineSchemaManager->introspectTable($tableName)->hasIndex($indexName);
    }
}

usage:

<?php

declare(strict_types=1);

use App\Domain\Migration\MigrationUtil;
use Illuminate\Database\Migrations\Migration;

return new class() extends Migration {
    public function up(): void
    {
        Schema::table('users', static function ($table) {
            if (MigrationUtil::hasIndex('users', 'unique_email')) {
                $table->dropUnique('unique_email');
            }
            if (!MigrationUtil::hasIndex('users', 'users_email_unique')) {
                $table->unique('email');
            }
        });
    }
};

Thanks! Great stuff 🙇‍♂️ 💯

In Laravel 11 Symfony's DBAL has been replaced by Laravel's native classes so above solutions does not work anymore. Here's the working dropIndexIfNotExists for Laravel 11.

<?php

namespace App\Traits;

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

trait MigrationIndex
{
    public function dropIndexIfExist(string $tableName, string $indexName): void
    {
        $indexes = Schema::getIndexes($tableName);

        foreach ($indexes as $index) {
            if ($index['name'] === $indexName) {
                Schema::table($tableName, static function (Blueprint $table) use ($indexName) {
                    $table->dropIndex($indexName);
                });
            }
        }
    }
}