Laravel - 播种多对多关系

Question

我有一个 users 表和一个 roles 具有 的表多对多 关系。这两个表连接到一个名为 的连接表。 role_user .
This is a model of the tables and its connections.
以下是我的 Laravel 项目中的模型:
用户
namespace App; use Illuminate\Database\Eloquent\Model; class User extends Model { public function roles() { return $this->belongsToMany('App\Role'); } } 角色
namespace App; use Illuminate\Database\Eloquent\Model; class Role extends Model { public function users() { return $this->belongsToMany('App\User'); } } 下面是 Laravel 项目中的工厂文件:

$factory->define(App\User::class, function (Faker\Generator $faker) {
    return [
        'name' => $faker->name,
        'email' => $faker->unique()->safeEmail,
        'password' => $password ?: $password = bcrypt('secret'),
    ];
});

$factory->define(App\Role::class, function (Faker\Generator $faker) {
    return [
        'role' => $faker->realText($maxNbChars = 2),
        'description' => $faker->realText($maxNbChars = 20),
    ];
});

下面是 Laravel 项目中的种子文件:

public function run()
{
    factory(App\User::class, 50)->create()->each(function ($u) {
        $u->roles()->save(factory(App\Role::class)->make());
    });

    factory(App\Role::class, 20)->create()->each(function ($u) {
        $u->users()->save(factory(App\User::class)->make());
    });
}

这应该填充 users 表和 roles 表但我如何去填充 role_user table ？ (我没有连接表的模型文件。)
我对此很陌生，因此任何帮助将不胜感激。谢谢。

Answer 1

您可以使用 attach() or sync() method在多对多关系上。

有多种方法可以解决这个问题。这是其中之一:

// Populate roles
factory(App\Role::class, 20)->create();

// Populate users
factory(App\User::class, 50)->create();

// Get all the roles attaching up to 3 random roles to each user
$roles = App\Role::all();

// Populate the pivot table
App\User::all()->each(function ($user) use ($roles) { 
    $user->roles()->attach(
        $roles->random(rand(1, 3))->pluck('id')->toArray()
    ); 
});