聊天：获取私聊历史消息

shared/consts/constModules/chatConst.ts

@@ -11,4 +11,6 @@ export const MSG_TYPE = {
     IMG: 2
 }
 
-export const ON_MSG_ROUTE = 'onMessage';
+export const ON_MSG_ROUTE = 'onMessage';
+
+export const DEFAULT_MSG_PER_PAGE = 10;

shared/db/PrivateMessage.ts

@@ -5,7 +5,7 @@ import { index, getModelForClass, prop, DocumentType, modelOptions } from '@type
   * 私聊信息
 **/
 @modelOptions({ schemaOptions: { id: false } })
-@index({ roomId: 1, seqId: 1 })
+@index({ roomId: 1, seqId: -1 })
 @index({ msgId: 1 })
 export default class PrivateMessage extends BaseModel {
     @prop({ required: true, default: '' })
@@ -36,7 +36,7 @@ export default class PrivateMessage extends BaseModel {
     content: string; // 消息内容
 
     public static async createMsg(data: PrivateMessageParam) {
-      const result = await PrivateMessageModel.findOneAndUpdate({}, {...data}, {upsert: true, new: true}).lean();
+      const result = await PrivateMessageModel.findOneAndUpdate({ msgCode: data.msgCode }, {...data}, {upsert: true, new: true}).lean();
       return result;
     }
 
@@ -44,6 +44,11 @@ export default class PrivateMessage extends BaseModel {
       const result = await PrivateMessageModel.findOne(query).lean();
       return result;
     }
+
+    public static async getMsgs(roomId: string, fromSeqId: number, count: number) {
+      const result = await PrivateMessageModel.find({ roomId, seqId: { $lt: fromSeqId } }).sort({ seqId: -1 }).limit(count).lean();
+      return result;
+    }
 }