如何在猫鼬中包含外部模型？

Question

当我想在 nodejs 中包含我的模型和猫鼬时，我遇到了一个问题，我正在使用这样的模式创建一个模型

var mongoose = require('mongoose')
  , Schema = mongoose.Schema;

var Users = new Schema({
    idUser  : {type:String},
    username: {type:String}
});

// middleware
Users.pre('save', function (next,done) {
  notify(this.get('email') + done);
  // something goes wrong
  next(new Error('something went wrong'));
});

//registered on mongoose models
mongoose.model("Users",Users);

我保存在折叠模型/schema.js 但是当我尝试使用此代码时，我不知道如何在 app.js 中调用该文件

var mongoose = require('mongoose')
  , models = require('./models/schema.js');

//mongoose configurationfor database;
var db = mongoose.connect("mongodb://localhost/vynchat");
var users = mongoose.model("Users");
users.save();

当我尝试启动sudo node app.js时出现错误

throw e; // process.nextTick error, or 'error' event on first tick
              ^
TypeError: Object function model() {
    Model.apply(this, arguments);
  } has no method 'save'
    at Object.<anonymous> (/opt/development/vynapp/app.js:18:7)
    at Module._compile (module.js:441:26)
    at Object..js (module.js:459:10)
    at Module.load (module.js:348:31)
    at Function._load (module.js:308:12)
    at Array.0 (module.js:479:10)
    at EventEmitter._tickCallback (node.js:192:40)

错误模型（）没有方法保存... 我该如何解决这个问题..？

Answer 1

您在创建模型对象时缺少架构对象参数。 这样做：

var users_model = mongoose.model("Users", YourSchemaObject);
var User_Document = new user_model();
User_Document.field_name = 'value'; //here you can access getter/setter/methods
User_Document.save();

Answer 2

你打电话给users.save();，但是users是一个模型。

save 方法可用于模型实例，例如：

var mongoose = require('mongoose')
  , models = require('./models/schema');

var db = mongoose.connect("mongodb://localhost/vynchat")
  , Users = mongoose.model("Users");


var user = new User({
      "your": "data"
    });

user.save(function (err, model) {
  if (err) throw err;

  console.log("My new User is saved",
    "`save` hook worked as espected since we had no errors here");
});

您应该阅读 node.js modules API 并仔细阅读 mongoose API。

附带说明：当您第一次在代码节点中require('mongoose') 会给您一个猫鼬连接器的实例时，后续要求将产生相同的对象。