javascript - Mongoose - 无法调用方法 'findOne'

Question

我尝试使用护照添加 Facebook 登录信息，但遇到以下错误:

类型错误:无法在 Strategy._verify 中调用未定义的方法“findOne”

我的 app.js 文件中需要 models.js，并且我正在传递到护照模型

app.js

var Models = require('./config/models');
require('./config/passport')(passport,loginStrategies,Models);

我的护照模型 - passport.js:

module.exports = function(passport, loginStrategies, Models){
   //Passport serialize and deserialize user

   passport.use(new loginStrategies.FacebookStrategy({
      //FB App Config
    },function(token, tokenSecret, profile, done) {

    Models.User.findOne({uid: profile.id}, function(err, user) {
      if(user) {
        done(null, user);
      } else {
        var user = new Models.User();

        user.uid = profile.id;
        user.name = profile.displayName;
        user.email = profile.email;

        user.save(function(err) {
          if(err) {
            throw err;
          }
          done(null, user);
        });
      }
    });

    // ...

Models.js

var mongoose = require("mongoose");
var Schema = mongoose.Schema;
module.exports = function(){

    DB_URL = "mongodb://localhost/test";

    //User Schema

    var UserSchema = new Schema({
        uid: Number,
        name: String,
        email: String,
    });


    mongoose.connect(DB_URL);

    mongoose.model('User', UserSchema);

    return{
        User : mongoose.model('User')   
    }; 

};

Answer 1

由于 models.js 正在导出函数:

var mongoose = require("mongoose");
var Schema = mongoose.Schema;
module.exports = function(){ // <!---
    // ...
};

需要包含对它的调用，以便Object 和要返回的User 模型。无论模块是 required:

var Models = require('./config/models')();
//                                     ^^
require('./config/passport')(passport,loginStrategies,Models);

console.log(typeof Models);    // 'object'
console.log('User' in Models); // true

或者，它的使用地点:

module.exports = function(passport, loginStrategies, Models){
   //Passport serialize and deserialize user

   var models = Models();

   // ...

       models.User.findOne(...);