//app.js
var Account = require('./models/account');
passport.use(new LocalStrategy(Account.authenticate()));

//account.js
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var passportLocalMongoose = require('passport-local-mongoose');

var Account = new Schema({
    username: String,
    password: String
});

Account.plugin(passportLocalMongoose);

module.exports = mongoose.model('Account', Account);

passport.use(new LocalStrategy(function(username, password, done) {
    User.findOne({ username: username }, function (err, user) {
        if (err) {  //error interacting with database
            return done(err);
        }

        if (!user) {   //cannot find user
            return done(null, false);
        }

        if (!user.verifyPassword(password)) {  // passwords don't match?
            return done(null, false);
        }

        return done(null, user);
    });
  }
));