生成关系的种子数据

Question

我想为某些书籍生成种子数据，每本书都会对每个用户进行评分。当我为工厂和播种机运行我的db:seed时，我没有得到理想的结果

书店

use App\Book;
use App\Rating;
use Faker\Generator as Faker;

$factory->define(Book::class, function (Faker $faker) {
return [
    'title'     => $faker->sentence,
    'author'    => $faker->name,
    'user_id'   => 1
];
});

$factory->define(Rating::class, function (Faker $faker) {
return [
    'user_id'   => 1,
    'book_id'   => mt_rand(1, 5),
    'rating'   => mt_rand(1, 5)
];
});

BooksTableSeeder

public function run()
{
    // First remove existing books records
    Book::truncate();

    factory(App\Book::class, 5)->create()->each(function ($book) {
        // Add book rating
        $ratings = factory(App\Rating::class, 1)->make();
        $book->ratings()->saveMany($ratings);
    });
}

行为错误此代码返回一个具有来自一个用户的多个评级的图书

正确的行为一本书每个用户只能有一个评级

如何更正我的代码以实现此目标？

Answer 1

在生成评级时尝试设置book_id：

    factory(App\Book::class, 5)->create()->each(function ($book) {
    // Add book rating
    $ratings = factory(App\Rating::class, 1)->create(['book_id' => $book->id]);
    $book->ratings()->saveMany($ratings);
});