huixiang_app/lib/im/database/message.dart

import 'package:floor/floor.dart';

@entity
class Message {
  @primaryKey
  int id;

  int fromId;

  int toId;

  String content;

  String attach;

  int msgType;

  int time;

  int state;

  int isDelete;

  Message(id, fromId, toId, content, attach, msgType, time, state, isDelete);

  factory Message.fromJson(Map<String, dynamic> json) => Message(
      json["id"],
      json["fromId"],
      json["toId"],
      json["content"],
      json["attach"],
      json["msgType"],
      json["time"],
      json["state"],
      json["isDelete"]);

  Map<String, dynamic> toJson() => <String, dynamic>{
        "id": id,
        "fromId": fromId,
        "toId": toId,
        "content": content,
        "attach": attach,
        "msgType": msgType,
        "time": time,
        "state": state,
        "isDelete": isDelete == null ? 0 : isDelete
      };
}

createMessage(var toId, String content, {String attach, int msgType, userId}) {
  return Message.fromJson(<String, dynamic>{
    "fromId": userId,
    "toId": toId,
    "content": content,
    "attach": attach,
    "msgType": msgType ?? 0,
    "time": DateTime.now().millisecondsSinceEpoch,
    "state": 0,
    "isDelete": 0
  });
}