Laravel Faker工厂关系

Question

我有两家工厂，一家生产类别，另一家生产产品。当我运行工厂时，我想为生成的每个类别创建x个产品。我该如何编写代码来生产它呢？

类别的定义如下所示：

return [
            'name' => $this->faker->word,
            'slug' => Str::slug($this->faker->unique()->word, '-'),
        ];

产品的定义是这样写的：

return [
                'category_id' => 1, //instead of 1 the category id used i want to be random
                'name' => $this->faker->word,
                'slug' => Str::slug($this->faker->unique()->word, '-'),
                'description' => $this->faker->paragraph,
                'price' => $this->faker->randomFloat(2, 0, 10000),
                'is_visible' => 1,
                'is_featured' => 1
            ];

正如你所看到的，我硬编码了category_id，我不太确定如何让它自动生成并为每个现有的类别创建一个产品。我有这样写的类别工厂，以创建10个项目

Category::factory()
                ->count(10)
                ->create();

我试了试，认为它可以工作，但我得到了一个错误，category_id cannot be null。

Product::factory()
                ->has(Category::factory()->count(2))
                ->count(20)
                ->create();

Answer 1

    $factory->define(Product::class, function (Faker $faker) {
    return [
        'category_id' => factory(Category::class), //instead of 1 the category id used i want to be random
        'name' => $this->faker->word,
        'slug' => Str::slug($this->faker->unique()->word, '-'),
        'description' => $this->faker->paragraph,
        'price' => $this->faker->randomFloat(2, 0, 10000),
        'is_visible' => 1,
        'is_featured' => 1
    ];
});

通过将属性设置为factory()的实例，Laravel也会懒洋洋地创建该模型，并自动关联它

Answer 2

我正在使用一种不同的语法，但我认为它会起作用/你可以改变它

在Category.php模型中

public function products() {
    return $this->hasMany(Product::class);
}

在seeder中

factory(App\Category::class, 10)->create()->each(function($c) {
    $c->products()->save(factory(App\Product::class)->make());
}); // each Category will have 1 product

Laravel Database Testing Relationships

Answer 3

您只需要向category_id传递一个CategoryFactory。

return [
    'category_id' => Category::factory(),
    // ...
];

您可以在此处阅读有关工厂的更多信息：https://laravel.com/docs/8.x/database-testing#defining-relationships-within-factories