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我是laravel的初学者。我遵循了一些关于使用 Factory 制作虚拟数据的教程。我对此有疑问。这是我工厂的全部代码。

<?php

namespace Database\Factories;

use App\Models\Member;
use Illuminate\Database\Eloquent\Factories\Factory;


class MemberFactory extends Factory
{
    /**
     * The name of the factory's corresponding model.
     *
     * @var string
     */
    protected $model = Member::class;

    /**
     * Define the model's default state.
     *
     * @return array
     */
    public function definition()
    {
        $sex = $faker->randomElement(['male', 'female']);
        $users = App\Models\User::pluck('id')->toArray();

        return [
            'user_id' => $faker->randomElement($users),
            'firstname' => $this->faker->name,
            'middlename' => $this->faker->name,
            'lastname' => $this->faker->name,
            'name_ext' => $this->faker->name,
            'membership_date' => $this->faker->date('m-d-Y','now'),
            'date_of_birth' => $this->faker->dateTimeBetween($startDate = '-30 years', $endDate = 'now'),
            'sex' => $sex,                      
        ];
    }
}

当我试图执行它时给了我修补程序的错误

<warning>PHP Notice:  Undefined variable: faker in C:\xampp\htdocs\test\database\factories\MemberFactory.php on line 24</warning>
PHP Error:  Call to a member function randomElement() on null in
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