数据库Laravel中的多选引导插入

Schema::create('users', function (Blueprint $table) {
    $table->id();
    $table->string('name');
    $table->timestamps();
});

Schema::create('roles', function (Blueprint $table) {
    $table->id();
    $table->string('name');
    $table->timestamps();
});

Schema::create('role_user', function (Blueprint $table) {
    $table->id();
    $table->unsignedBigInteger('user_id');
    $table->unsignedBigInteger('role_id');
    $table->timestamps();

    $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
    $table->foreign('role_id')->references('id')->on('roles')->onDelete('cascade');
});

<form action="/users" method="POST">
    @csrf
    <input type="text" name="name" placeholder="User Name">
    <select name="roles[]" multiple>
        @foreach ($roles as $role)
            <option value="{{ $role->id }}">{{ $role->name }}</option>
        @endforeach
    </select>
    <button type="submit">Submit</button>
</form>

use App\Models\User;
use App\Models\Role;

public function store(Request $request)
{
    $user = User::create([
        'name' => $request->name,
    ]);

    if ($request->has('roles')) {
        $user->roles()->attach($request->roles);
    }

    return redirect('/users')->with('success', 'User created successfully!');
}

<form action="/users" method="POST" enctype="multipart/form-data">
    ...
</form>

$user->roles()->attach($request->roles);

$request->validate([
    'name' => 'required|string',
    'roles' => 'required|array',
]);