node.js - Mean Stack MissingSchemaError: Schema hasn't been registered for model "User" -

i have tried many solutions given on stack overflow nothing worked in case... here code... server.js entry point of application.

process.env.node_env = process.env.node_env || 'development';  var config = require('./config/config'),     mongoose = require('./config/mongoose'),     passport = require('./config/passport'),     express = require('./config/express'); var passport = passport(); var db = mongoose(),     app = express();  app.listen(config.port);  module.exports = app; console.log(process.env.node_env  + ' server running @ http://localhost:' + config.port); 

my config.js is

module.exports = require('./env/' + process.env.node_env + '.js'); 

mongoos.js

var config = require('./config'),     mongoose = require('mongoose');  module.exports = function() {     var db = mongoose.connect(config.db);     require('../app/models/user.server.model');     return db; }; 

passport.js

var mongoose = require('mongoose'); var passport = require('passport'); var user = mongoose.model('user');  module.exports = function() {      passport.serializeuser(function(user, done) {         done(null, user.id);     });      passport.deserializeuser(function(id, done) {         user.findone(             {_id: id},             '-password',             function(err, user) {                 done(err, user);             }         );     });      require('./strategies/local.js')(); }; 

express.js

var config = require('./config'),     express = require('express'),     bodyparser = require('body-parser'),     passport = require('passport');    module.exports = function() {     var app = express();     var session = require('express-session');       var flash = require('connect-flash');      app.use(flash());      app.use(session({         saveuninitialized: true,         resave: true,         secret: 'oursupersecretcookiesecret'     }));      app.use(bodyparser.urlencoded({         extended: true     }));      //use code before route definitions     app.use(passport.initialize());     app.use(passport.session());      app.use(bodyparser.json());      app.set('views', './app/views');     app.set('view engine', 'ejs');      require('../app/routes/index.server.routes.js')(app);     require('../app/routes/users.server.routes.js')(app);      app.use(express.static('./public'));      return app; }; 

and modal file users.server.model.js here.

var mongoose = require('mongoose'),     crypto = require('crypto'),     schema = mongoose.schema;  var userschema = new schema({     name: string,     email: string,     username: {         type: string,         trim: true,         unique: true     },     password: string,     provider: string,     providerid: string,     providerdata: {},     todos: {}//we use in next tutorial store todos });  userschema.pre('save',     function(next) {         if (this.password) {             var md5 = crypto.createhash('md5');             this.password = md5.update(this.password).digest('hex');         }          next();     } );  userschema.methods.authenticate = function(password) {     var md5 = crypto.createhash('md5');     md5 = md5.update(password).digest('hex');      return this.password === md5; };  userschema.statics.finduniqueusername = function(username, suffix, callback) {     var _this = this;     var possibleusername = username + (suffix || '');      _this.findone(         {username: possibleusername},         function(err, user) {             if (!err) {                 if (!user) {                     callback(possibleusername);                 }                 else {                     return _this.finduniqueusername(username, (suffix || 0) + 1, callback);                 }             }             else {                 callback(null);             }         }     ); };  var user = mongoose.model('user', userschema); exports = user; 

at last 2 lines have tried different approaches tried mongoose.model('user', userschema); line doesn't worked. using tutorial https://hackhands.com/mongodb-crud-mvc-way-with-passport-authentication/

you loading /config/passport before model registering. need require file registers model first. this:

var config = require('./config/config'),     mongoose = require('./config/mongoose'),     // require file has model     model = require('./path/to/users.server.model'),     passport = require('./config/passport'),     express = require('./config/express'); var passport = passport(); var db = mongoose(),     app = express(); 

alternatively, can include file inside /config/passport.js before calling var user = mongoose.model('user');