toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'slot_id': slotId,
'currently_boosted_chat_id': currentlyBoostedChatId,
'start_date': startDate,
'expiration_date': expirationDate,
'cooldown_until_date': cooldownUntilDate,
'@type': constructor,
};