app.js

var express     = require("express"),
    app         = express(),
    bodyParser  = require("body-parser"),
    mongoose    = require("mongoose"),
    passport    = require("passport"),
    LocalStrategy = require("passport-local"),
    Campground  = require("./models/campground"),
    Comment     = require("./models/comment"),
    User        = require("./models/user"),
    seedDB      = require("./seeds");

//requiring routes
var commentRoutes       = require("./routes/comments"),
    campgroundRoutes    = require("./routes/campgrounds"),
    indexRoutes         = require("./routes/index");

mongoose.connect("mongodb://localhost:27017/yelp_camp_v4", {useNewUrlParser: true});
app.use(bodyParser.urlencoded({extended:true}));
app.set("view engine", "ejs");
app.use(express.static(__dirname + "/public"));
//seedDB();  //seed the database

//Passport configuration
app.use(require("express-session")({
    secret: "Bills are going to win superbowl",
    resave: false,
    saveUninitialized: false
}));

app.use(passport.initialize());
app.use(passport.session());
passport.use(new LocalStrategy(User.authenticate()));
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());

//this allows us to pass if currentuser is logged in or
//not to ever route
app.use(function(req, res, next){
    res.locals.currentUser = req.user;
    next();
});

app.use(indexRoutes);
app.use("/campgrounds", campgroundRoutes);              //automatically add /campgrounds to the path
app.use( "/campgrounds/:id/comments", commentRoutes);

app.listen(3000, function(){
    console.log("YelpCamp Has Started!");
});