The method to create a new seeder in Laravel is to use the php artisan make:seeder command, 1. Execute the command such as php artisan make:seeder UsersTableSeeder to generate a Seeder file; 2. Write the insertion data logic in the run() method, and it is recommended to use the model factory to create data; 3. Add the new seeder to the run() method of DatabaseSeeder.php to call it; 4. You can use the --class parameter to run the specified seeder separately, or run all seeders. The entire process needs to pay attention to the order of Seeder calls and database configuration integrity.

Creating a new seeder in Laravel is very simple, and the core command is php artisan make:seeder . Just run the Artisan command and the Seeder name you want to create, and Laravel will automatically generate the corresponding class file for you.

1. Use make:seeder command correctly

To create a Seeder, just execute it in the terminal:

 php artisan make:seeder UsersTableSeeder

This will generate a file named UsersTableSeeder.php in database/seeders directory. Laravel will give you a basic structure by default, which contains run() method that can be used to insert test data.

Note: The Seeder name is usually recommended to end with the table name Seeder, such as PostsTableSeeder , so you can tell which table is used to fill in at a glance.

2. Write Seeder content

Open the Seeder file you just created and you will see a run() method. You can call the Eloquent model or DB facade in this method to insert data. For example:

 public function run()
{
    DB::table('users')->insert([
        'name' => 'John Doe',
        'email' => 'john@example.com',
        'password' => bcrypt('password'),
    ]);
}

Or if you have defined the model and Factory, you can directly use the model to create batches:

 User::factory(10)->create();

This method is more recommended because Factory can help you generate fake data quickly and save time.

3. Call your Seeder in DatabaseSeeder

The newly created Seeder will not run automatically, you need to manually add it to the DatabaseSeeder.php file. Open database/seeders/DatabaseSeeder.php and add in run() method:

 $this->call(UsersTableSeeder::class);

You can add multiple Seeders as needed, and the order will also affect the data dependencies, so pay attention to the order of arrangement.

4. Remember to add --class parameter when running Seeder (optional)

If you want to run a Seeder alone, not all, you can do this:

 php artisan db:seed --class=UsersTableSeeder

This is very useful when debugging or updating specific data. If it is only the early stage of development, it is OK to run all Seeders directly:

 php artisan db:seed

Basically that's it. The entire process is not complicated, but it is easy to ignore that you need to call the newly created class in the main Seeder and ensure that the database connection and migration are processed.

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