How To Add Index In Laravel 10 Migration

In this article, we will see how to add an index in laravel 10 migration. Here, we will learn about the laravel 10 add index using migration. The Laravel schema builder supports several types of indexes. let’s discuss laravel 10 migration to create an index.

So, let's see how to add an index in laravel 10 migration, laravel 10 migration add an index to an existing column, laravel 10 migration drop index, and how to add indexing in laravel 10.

Laravel provides an index() method for adding an index to column using migration.

Syntax:

$table->index('column_name');

Example:

$table->index('state');	

// Multiple columns
$table->index(['account_id', 'created_at']);

In this example, we will create a simple index. So, create a migration and add an index to the column.

php artisan make:migration create_posts_table

Migration:

<?php
  
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
  
class CreatePostsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('posts', function (Blueprint $table) {
            $table->id();
            $table->string('title');
            $table->text('description');
            $table->timestamps();
  
            $table->index(['title', 'created_at']);
        });
    }
    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('posts');
    }
}

The following example creates a new email column and specifies that its values should be unique.

php artisan make:migration create_users_table

Alternatively, you may create the index after defining the column. To do so, you should call the unique method on the schema builder blueprint. This method accepts the name of the column that should receive a unique index

Migration:

<?php
  
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
  
class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->string('email')->unique();
            $table->timestamps();
  
            $table->unique('email');
        });
    }
    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('users');
    }
}

When creating an index, Laravel will automatically generate an index name based on the table, column names, and the index type, but you may pass a second argument to the method to specify the index name yourself

$table->unique('email', 'unique_email');

Laravel's schema builder blueprint class provides methods for creating each type of index supported by Laravel. Each index method accepts an optional second argument to specify the name of the index.

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