在 laravel 7 中使用工厂嵌套一对多关系

Question

我对一对多关系中的三个嵌套级别使用工厂有疑问这些是我的迁移：

    Schema::create('main_categories', function (Blueprint $table) {
        $table->id();
        $table->string('name', 100)->nullable(false);
    });

    Schema::create('categories', function (Blueprint $table) {
        $table->id();
        $table->string('name', 100)->nullable(false);

        $table->unsignedBigInteger('main_category_id');
        $table->foreign('main_category_id')
            ->references('id')
            ->on('main_categories')
            ->cascadeOnDelete();
    });

    Schema::create('sub_categories', function (Blueprint $table) {
        $table->id();
        $table->string('name', 100)->nullable(false);

        $table->unsignedBigInteger('category_id');
        $table->foreign('category_id')
            ->references('id')
            ->on('categories')
            ->cascadeOnDelete();
    });

这些是我的模型

class MainCategory extends Model
{
   ...

   public function categories()
   {
       return $this->hasMany(Category::class);
   }
}

class Category extends Model
{
    ...

    public function MainCategory()
    {
        return $this->belongsTo(MainCategory::class);
    }

    public function subCategories()
    {
        return $this->hasMany(SubCategory::class);
    }
}

class SubCategory extends Model
{
    ...

    public function category()
    {
        return $this->belongsTo(Category::class);
    }

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

这些是我的工厂：

$factory->define(MainCategory::class, function (Faker $faker) {
    return [
        'name'=>$faker->name
    ];
});
$factory->define(Category::class, function (Faker $faker) {
    return [
        'name' => $faker->name
    ];
});
$factory->define(SubCategory::class, function (Faker $faker) {
    return [
        'name' => $faker->name
    ];
});

我像这样使用这些工厂。我应该说，我想在创建 MainCategory 行时，立即创建与 MainCategory 有一对多关系的类别，然后 SubCategory 应该创建与类别有一对多关系的类别。我不知道我的错误在哪里：

factory(MainCategory::class, 5)->create()->each(function ($mainCategory) {
    $mainCategory->categories()->saveMany(factory(Category::class, 7)->make()->each(function ($category){
        $category->subCategories()->saveMany(factory(SubCategory::class, 7)->make());
    }));
});

Answer 1

现在回答你有点晚了，但它可能对另一个 Laravel 开发人员有用。我和你有同样的问题，经过深思熟虑，我建议你在你的代码中“休息一下”。像这样：

factory(MainCategory::class, 5)->create()->each(function ($mainCategory) {

    $mainCategory->categories()->saveMany(factory(Category::class, 7)->make();
    // Break
    $mainCategory->categories->each(function ($category){

        $category->subCategories()->saveMany(factory(SubCategory::class, 7)->make());
        // Break
        // $category->subcategories->each(function ($sub){
        //     ....
        // });

    }));

});

现在可以做很多关系了

在 laravel 7 中使用工厂嵌套一对多关系

using factories for nested one to many relations in laravel 7

factory

laravel-7