public function findByCycle(Type $cycle, Carbon $since, Carbon $until, $limit = self::EXHIBITIONS_FOR_PAGE)
{
$dateInterval = [$since, $until];
$builder = Exhibition::where('type_id', $cycle->getId())->whereHas('schedules', function (Builder $query) use($dateInterval) {
$query->whereBetween('entry', $dateInterval);
});
$exhibitions = $this->addRelationships($builder, $limit);
return $exhibitions;
}
