can't use assign role to User where i give factory - laravel

Question

I want to create users with factories and directly assign roles to them. However, I encountered an error while seeding.
My Error was like there :
Method Illuminate\Database\Eloquent\Collection::assignRole does not exist.
Here is the code from my databaseSeeder.php :
$user = User::factory(10)->create()->assignRole('Admin');
That is my UserFactory code. This is default, I dont change anithing:
namespace Database\Factories;
use Illuminate\Database\Eloquent\Factories\Factory;
use Illuminate\Support\Str;
/**
* #extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\User>
*/
class UserFactory extends Factory
{
/**
* Define the model's default state.
*
* #return array<string, mixed>
*/
public function definition()
{
return [
'name' => fake()->name(),
'email' => fake()->unique()->safeEmail(),
'email_verified_at' => now(),
'password' => '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', // password
'remember_token' => Str::random(10),
];
}
/**
* Indicate that the model's email address should be unverified.
*
* #return static
*/
public function unverified()
{
return $this->state(fn (array $attributes) => [
'email_verified_at' => null,
]);
}
}
This is my user model:
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
use Laravel\Sanctum\HasApiTokens;
use Spatie\Permission\Traits\HasRoles;
use PHPOpenSourceSaver\JWTAuth\Contracts\JWTSubject;
use Spatie\MediaLibrary\HasMedia;
use Spatie\MediaLibrary\InteractsWithMedia;
class User extends Authenticatable implements JWTSubject, HasMedia
{
use HasApiTokens, HasFactory, Notifiable, HasRoles, InteractsWithMedia;
/**
* The attributes that are mass assignable.
*
* #var array<int, string>
*/
protected $fillable = [
'name',
'e-mail',
'passwords',
];
protected $casts = [
'email_verified_at' => 'datetime',
];
}
Please help me, Thanks!

Answer 1

Try assigning the role in your User factory callback like so:
class UserFactory extends Factory
{
...
public function configure()
{
return $this->afterCreating(function (User $user) {
$user->assignRole('Administrator');
});
}
...
This method will be automatically run when you run the factory. After each create it will run assignRole on the created User model.
Use the factory like so:
User::factory()->count(10)->create();
https://laravel.com/docs/8.x/database-testing#factory-callbacks