updateContent property Null safety

QChatMsgUpdateContent? updateContent
@JsonKey(fromJson: _qChatMsgUpdateContentFromJson), read / write

消息更新内容,消息被修改/撤回/删除 才有值,否则为null

Implementation

@JsonKey(fromJson: _qChatMsgUpdateContentFromJson)
QChatMsgUpdateContent? updateContent;