生成具有关系的种子数据

Question

我想为一些书籍生成种子数据，每本书都会有每个用户的评分。当我为工厂和播种机运行 db:seed 时，我没有得到想要的结果

书厂

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);
    });
}

错误行为此代码返回一本书，其中包含来自一个用户的多个评分

正确的行为一本书应该只有一个用户评分

如何更正我的代码以实现此目标？

Answer 1

在生成评分时尝试设置 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);
});