Laravel-建立多对多关系 [英] Laravel - Seeding Many-to-Many Relationship

问题描述

我有一个 users 表和一个具有多对多关系的 roles 表.这两个表连接到名为 role_user 的联结表.

I have a users table and a roles table that has a many-to-many relationship. These two tables are connected to a junction table called role_user.

这是表及其连接的模型.

下面是我的Laravel项目中的模型:

Below are the Models in my Laravel project:

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:

Below is the Factory file in the Laravel project:

$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),
    ];
});

以下是Laravel项目中的种子文件:

Below is the Seed file in the Laravel project:

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，但是如何填充 role_user 表? (我没有连接表的模型文件.)

This should populate the users table and the roles table but how do I go about populating the role_user table? (I don't have a Model file for the junction table.)

我对此很陌生，因此不胜感激.谢谢.

I'm very new at this so any help would be appreciated. Thanks.

推荐答案

您可以使用

You can use attach() or sync() method on a many-to-many relationship.

有多种方法可以解决此问题.这里是其中之一:

There are multiple ways you can approach this. Here one of them:

// 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()
    ); 
});

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