Laravel-播种多对多关系

我有一张users表和一张roles表有多对多关系的表.这两个表连接到一个名为的联结表role_user.

这是表及其连接的模型.

以下是我的Laravel项目中的模型:

用户

namespace App;

use Illuminate\Database\Eloquent\Model;

class Role 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');
    }
}

以下是Laravel项目中的Factory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,但我如何填充role_user表？(我没有联结表的模型文件.)

我对此很新,所以任何帮助都会受到赞赏.谢谢.

您可以在多对多关系上使用attach()或sync()使用方法.

有多种方法可以解决这个问题.其中一个:

// 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()
    ); 
});

public function run()
{

   factory(App\User::class,3)->create();

   $roles = factory(App\Role::class,3)->create();

   App\User::All()->each(function ($user) use ($roles){
      $user->roles()->saveMany($roles);
   });
}