3 个实体之间的播种机问题

Question

我对播种机新闻有疑问。它有两个实体之间的关系。命令 php artisan db:seed 的结果是下一个：

Illuminate\Database\QueryException：SQLSTATE[HY000]：一般错误：1364 Fi 字段'user_id'没有默认值（SQL：插入news（title，b ody，author，created_at，updated_at）值（博士，Nisi quia et provident expedita voluptatem debitis quas。 Ut in dicta magni voluptatum hic facere adipis ci。 Eum aut porro voluptatem est sit numquam ex a., Janiya Lowe, 2019-09-19 06:5 4:25, 2019-09-19 06:54:25))

我有 3 个实体：

User                          News                             Category
id                             id                                id                                              
                              user_id                         
                              category_id                                                                    

我的 NewsTableSeeder 是下一个：

public function run()
    {
        factory(News::class, 20)->create()->each(function ($news) {
            $news->category()->save(factory(NewsCategory::class)->make());
            $news->writtenBy()->save(factory(User::class)->make());
        });
    }

我的班级新闻是下一个

class News extends Model
{
    protected $table = 'news';
    protected $fillable = ['title', 'body', 'author', 'created_at', 'update_at'];

    /**
     * WrittenBy belongs to User.
     */
    public function writtenBy()
    {
        return $this->hasOne(User::class);
    }

    /**
     * Category belongs to User.
     */
    public function category()
    {
        return $this->hasOne(NewsCategory::class);
    }
}

你能帮帮我吗？

Answer 1

检查一下，

public function run()
    {
 DB::statement('SET FOREIGN_KEY_CHECKS=0;');
        factory(News::class, 20)->create()->each(function ($news) {
            $news->category()->save(factory(NewsCategory::class)->make());
            $news->writtenBy()->save(factory(User::class)->make());
        });
 DB::statement('SET FOREIGN_KEY_CHECKS=1;');
    }