MongoDB的架構 - 錯誤的createIndex調用（）設置expireAt

Question

我寫我的模式，但是當我跑我的Node.js服務器下面的錯誤顯示：

MySchema.createIndex不是一個函數

我使用它來設置記錄的expireAt。這是我的代碼：

var mongoose = require('mongoose'); 
var Schema = mongoose.Schema; 
var config = require('../../config.js'); 

var tc = new Date(); 
var te = tc.setSeconds(tc.getSeconds + config.EXPIRE_TOKEN_TIME.ROOM_TOKEN); 

var MySchema = new Schema({ 
    name: String, 
    guide: String, 
    leader: String, 
    partecipants_counter : { type: Number, default: 0}, 
    event_counter : { type: Number, default: 0}, 
    createAt: { type: Date, default: tc}, 
    expireAt: { type: Date, default: te}, 
    partecipants: [], 
    events : [ { 
      id : Number, 
      data: String, 
      user: String 
      } ] 
}); 

MySchema.createIndex({ "expireAt": 1 }, { expireAfterSeconds: 180 }); 

module.exports = mongoose.model(config.DATA_TYPE.ROOM, MySchema); 

Answer 1

的語法應該是

MySchema.index({ "expireAt": 1 }, { expireAfterSeconds: 180 }); 

更通用的例子： -

var animalSchema = new Schema({ 
    name: String, 
    type: String, 
    tags: { type: [String], index: true } // field level 
}); 

animalSchema.index({ name: 1, type: -1 }); // schema level