घोषित करें mongoose.connect
मॉडल आयात से ऊपर
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var mongoose = require('mongoose')
mongoose.connect('mongodb://localhost/SK');
var MerchantModel = require('./models/merchant');
// var mongoose = require('mongoose').model('merchant');
var index = require('./routes/index');
var merchant = require('./routes/merchant');
var app = express();