nullableFields = [ ...$this->nullableFields, 'start_at', 'end_at', ]; $this->dates = [ ...$this->dates, 'start_at', 'end_at', ]; } const TITLE = LineModel::TITLE; public function getType(): string { return $this->type; } public function getProtocol(): string { return $this->protocol; } public function getBandwith(): string { return $this->bandwith; } public function getStartAt(): ?string { return $this->start_at; } public function getEndAt(): ?string { return $this->end_at; } }