Repeater HasMany

Repeater::make('federationOpponent')
                        ->columns(1)
                        ->model(Opponent::class)
                        ->relationship('federationOpponent')
                        ->schema([
                            Select::make('federation_id')
                                ->relationship('federation', 'tag')
                                ->required()
                                ->distinct(),
                            TextInput::make('federation_code')
                                ->required(),
                        ])
                        ->addActionLabel('Add Federation')

class Opponent extends Model
{
    public function federationOpponent(): HasMany
    {
        return $this->hasMany(FederationOpponent::class, 'opponent_id');
    }
}

class FederationOpponent extends Pivot
{
    protected $table = 'federation_opponent';
    protected $fillable = ['federation_id', 'opponent_id', 'federation_code'];

    public function federation(): BelongsTo
    {
        return $this->belongsTo(Federation::class);
    }

    public function opponent(): BelongsTo
    {
        return $this->belongsTo(Opponent::class);
    }
}