User BelongsToMany Groups pivot table with additional "Role" field, how to select role?

I have a

users

users

table and a

groups

groups

table, with a many to many relationship between them, using the group_user pivot table, which contains a

role

role

field, which can be interpreted as a

group_role

group_role

.

I have added the groups field to my UserResource form like this:

public static function form(Form $form): Form
    {
        return $form
            ->schema([
                Forms\Components\TextInput::make('name')
                    ->label('Username')
                    ->required(),
                Forms\Components\TextInput::make('email')
                    ->email()
                    ->required()
                    ->unique(ignoreRecord: true),
                Forms\Components\TextInput::make('password')
                    ->password()
                    ->required(fn ($livewire) => $livewire instanceof Pages\CreateUser) 
                    ->hidden(fn ($livewire) => $livewire instanceof Pages\EditUser), 
                Forms\Components\TextInput::make('first_name')
                    ->required(),
                Forms\Components\TextInput::make('last_name')
                    ->required(),
                PhoneInput::make('phone_number')
                    ->validateFor()
                    ->defaultCountry('CH')
                    ->required(),
                Forms\Components\TextInput::make('address')
                    ->required(),
                Forms\Components\Select::make('roles')
                    ->relationship('roles', 'name')
                    ->multiple()
                    ->preload(),
                Forms\Components\Select::make('groups')
                    ->relationship('groups', 'name')
                    ->multiple()
                    ->preload(),
            ]);
    }

public static function form(Form $form): Form
    {
        return $form
            ->schema([
                Forms\Components\TextInput::make('name')
                    ->label('Username')
                    ->required(),
                Forms\Components\TextInput::make('email')
                    ->email()
                    ->required()
                    ->unique(ignoreRecord: true),
                Forms\Components\TextInput::make('password')
                    ->password()
                    ->required(fn ($livewire) => $livewire instanceof Pages\CreateUser) 
                    ->hidden(fn ($livewire) => $livewire instanceof Pages\EditUser), 
                Forms\Components\TextInput::make('first_name')
                    ->required(),
                Forms\Components\TextInput::make('last_name')
                    ->required(),
                PhoneInput::make('phone_number')
                    ->validateFor()
                    ->defaultCountry('CH')
                    ->required(),
                Forms\Components\TextInput::make('address')
                    ->required(),
                Forms\Components\Select::make('roles')
                    ->relationship('roles', 'name')
                    ->multiple()
                    ->preload(),
                Forms\Components\Select::make('groups')
                    ->relationship('groups', 'name')
                    ->multiple()
                    ->preload(),
            ]);
    }

*The roles field in the table is for global user roles, and unrelated to my issue.
I need a way to assign a

group_role

group_role

to my users within each group they belong to, what is the filament way to do this?

Solution

It seemed like the relation manager was the filament way to do this. I added the --attach flag to my php artisan command when creating the relation manager, then removed the create and delete methods so that I would only be able to edit, attach, and detach relations.
For others in the same situation, you can find all information about this here:
https://filamentphp.com/docs/3.x/panels/resources/relation-managers