nodejs开发微信1——微信access-token和tickets的数据模型

/* jshint -W079 */
/* jshint -W020 */

"use strict";
//var _ = require("lodash");

module.exports = function(utils, db) {

    // Model WeChatAccessTokenSchema
    var WeChatAccessTokenSchema = new db.Schema({
        appid:  {type: String, trim:true, required: true },
        access_token: {type: String, trim:true},
        expires_in: Number,
        at: {type: Number, default: parseInt(new Date().getTime() / 1000)},
        create_at: {type: Date, default: Date.now}
    }, db.schema_options);

    WeChatAccessTokenSchema.index({ appid: 1 });
    WeChatAccessTokenSchema.index({ access_token: 1 });

    global.WeChatAccessToken = db.mongoose.model('WeChatAccessToken', WeChatAccessTokenSchema);

    // Model WeChatTicketSchema
    var WeChatTicketSchema = new db.Schema({
        appid: {type: String, trim:true, required: true},
        ticket: {type: String, trim:true},
        noncestr: {type: String, trim:true},
        expires_in: Number,
        at: {type: Number, default: parseInt(new Date().getTime() / 1000)},
        create_at: {type: Date, default: Date.now}
    }, db.schema_options);

    WeChatTicketSchema.index({ appid: 1 });
    WeChatTicketSchema.index({ ticket: 1 });

    global.WeChatTicket = db.mongoose.model('WeChatTicket', WeChatTicketSchema);
};

数据库中只保存这两条数据,每次请求都是更新，不会增加；

这是mvc模式中的m，数据模型，