聊天：加入玩家发起的群聊和测试用例

shared/db/GroupMessage.ts

@@ -39,6 +39,21 @@ export default class GroupMessage extends BaseModel {
 
     @prop({ required: true, default: '' })
     content: string; // 消息内容
+
+    public static async createMsg(data: GroupMessageParam) {
+      const result = await GroupMessageModel.findOneAndUpdate({ msgCode: data.msgCode }, {...data}, {upsert: true, new: true}).lean();
+      return result;
+    }
+
+    public static async findOneMsg(query: GroupMessageParam) {
+      const result = await GroupMessageModel.findOne(query).lean();
+      return result;
+    }
+
+    public static async getMsgs(roomId: string, fromSeqId: number, count: number) {
+      const result = await GroupMessageModel.find({ roomId, seqId: { $lt: fromSeqId } }).sort({ seqId: -1 }).limit(count).lean();
+      return result;
+    }
 }