javascript - cannot export function in Express -

i'm trying implement passport.js , problem in way of exporting function in model:

user model file (user.js) looks like:

var mongoose = require('mongoose'); var schema = mongoose.schema; var passportlocalmongoose = require('passport-local-mongoose'); var bcrypt = require('bcrypt');  var userschema = mongoose.schema({   username: string,   password: string });  userschema.plugin(passportlocalmongoose);  userschema.methods = {      getuserbyusername: function(username, callback){         var query = {username: username};         userschema.findone(query, callback);         /*userschema.findone(query, function(err, user) {             callback(err, user);         }); */     },      getuserbyid: function(id, callback){         userschema.findbyid(id, callback);     },      comparepassword: function(candidatepassword, hash, callback){         bcrypt.compare(candidatepassword, hash, function(err, ismatch) {             if(err) throw err;             callback(null, ismatch);         });     } }  module.exports = mongoose.model('user', userschema); 

i call model (app.js):

// user schema/model var user = require('./models/user.js'); 

and i'm trying use exported functions in passport (app.js):

passport.use(new localstrategy(   function(username, password, done) {     user.getuserbyusername(username, function(err, user){       if(err) throw err;       if(!user){         return done(null, false, {message: 'unknown user'});     }      user.comparepassword(password, user.password, function(err, ismatch){       if(err) throw err;       if(ismatch){         return done(null, user);       } else {         return done(null, false, {message: 'invalid password'});       }     });    });   }));  passport.serializeuser(function(user, done) {   done(null, user.id); });  passport.deserializeuser(function(id, done) {   user.getuserbyid(id, function(err, user) {     done(err, user);   }); }); 

i got typeerror: user.getuserbyusername not function

i tried define function regarding docs:

user.methods.getuserbyusername = function(username, callback){         var query = {username: username};         user.findone(query, callback);     } 

and same error apperas in console when i'm trying login..

edit: i've added:

var user = mongoose.model('user', userschema);  module.exports = {   user: user }; 

and works methods definition:

module.exports.getuserbyusername() 

so final model file looks like:

// user model var mongoose = require('mongoose'); var schema = mongoose.schema; var passportlocalmongoose = require('passport-local-mongoose'); var bcrypt = require('bcrypt');  var userschema = mongoose.schema({   username: string,   password: string });  userschema.plugin(passportlocalmongoose);  var user = mongoose.model('user', userschema);  module.exports = {   user: user };  module.exports.createuser = function(newuser, callback){     bcrypt.gensalt(10, function(err, salt) {         bcrypt.hash(newuser.password, salt, function(err, hash) {             newuser.password = hash;             newuser.save(callback);         });     }); }  module.exports.getuserbyusername = function(username, callback){     var query = {username: username};     user.findone(query, callback); }  module.exports.getuserbyid = function(id, callback){     user.findbyid(id, callback); }  module.exports.comparepassword = function(candidatepassword, hash, callback){     bcrypt.compare(candidatepassword, hash, function(err, ismatch) {         if(err) throw err;         callback(null, ismatch);     }); } 

thank guys help.

instead of

module.exports.getuserbyusername = ... 

or

user.methods.getuserbyusername = ... 

use

user.statics.getuserbyusername = ... 

see http://mongoosejs.com/docs/2.7.x/docs/methods-statics.html