public function exhibitions(): BelongsToMany {
return $this->belongsToMany(Exhibition::class)->withPivot('with_masterclass');
} Forms\Components\Select::make('exhibitions')
->relationship('exhibitions', 'country')
->options(Exhibition::where('active', '=', 1)->get()->pluck('name', 'id'))
->native(false)
->preload()
->multiple(),