server.js

// require express and other modules
var express = require('express'),
    app = express(),
    cors = require('cors'),
    bodyParser = require('body-parser'),
    mongoose = require('mongoose');

// configure cors (for allowing cross-origin requests)
app.use(cors());

// configure bodyParser (for receiving form data)
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

// serve static files from public folder
app.use(express.static(__dirname + '/public'));

// set view engine to ejs
app.set('view engine', 'ejs');

// connect to mongodb
mongoose.connect(
  process.env.MONGOLAB_URI ||
  process.env.MONGOHQ_URL ||
  'mongodb://localhost/crud-api'
);

// require models and seed data
var Book = require('./models/book'),
    Wine = require('./models/wine'),
    seedBooks = require('./seeds/books'),
    seedWines = require('./seeds/wines');


// API ROUTES

// get all books
app.get('/books', function (req, res) {
  // find all books in db
  Book.find(function (err, allBooks) {
    if (err) {
      res.status(500).json({ error: err.message });
    } else {
      res.json({ books: allBooks });
    }
  });
});

// create new book
app.post('/books', function (req, res) {
  // create new book with form data (`req.body`)
  var newBook = new Book(req.body);

  // save new book in db
  newBook.save(function (err, savedBook) {
    if (err) {
      res.status(500).json({ error: err.message });
    } else {
      res.status(201).json(savedBook);
    }
  });
});


/*
 * Get a single response object and 404 if it isn't found.
 * @param err {Object} Error reported from Mongo.
 * @param foundObject {Object} An Object found by Mongo.
 * @this Express Response Object
 */
function getSingularResponse (err, foundObject) {
  if (err) {
    this.status(500).json({ error: err.message });
  } else {
    if (foundObject === null) {
      this.status(404).json({ error: "Nothing found by this ID." });
    } else {
      this.status(200).json(foundObject);
    }
  }
}

app.get('/books/:id', function (req, res) {
  // get book id from url params (`req.params`)
  var bookId = req.params.id;

  // find book in db by id
  Book.findOne({ _id: bookId }, getSingularResponse.bind(res));
});

// update book
app.put('/books/:id', function (req, res) {
  // get book id from url params (`req.params`)
  var bookId = req.params.id;

  // find book in db by id
  Book.findOne({ _id: bookId }, function (err, foundBook) {
    if (err) {
      return res.status(500).json({ error: err.message });
    }

    if (!foundBook){
     return res.status(404).json({ error: "Nothing found by this ID." });
    }

    // update the books's attributes
    foundBook.title = req.body.title;
    foundBook.author = req.body.author;
    foundBook.image = req.body.image;
    foundBook.releaseDate = req.body.releaseDate;

    // save updated book in db
    foundBook.save(getSingularResponse.bind(res));

  });
});

// delete book
app.delete('/books/:id', function (req, res) {
  // get book id from url params (`req.params`)
  var bookId = req.params.id;

  // find book in db by id and remove
  Book.findOneAndRemove({ _id: bookId }, getSingularResponse.bind(res));
});

// get all wines
app.get('/wines', function (req, res) {
  // find all wines in db
  Wine.find(function (err, allWines) {
    if (err) {
      res.status(500).json({ error: err.message });
    } else {
      res.json({ wines: allWines });
    }
  });
});

// create new wine
app.post('/wines', function (req, res) {
  // create new wine with form data (`req.body`)
  var newWine = new Wine(req.body);

  // save new book in db
  newWine.save(function (err, savedWine) {
    if (err) {
      res.status(500).json({ error: err.message });
    } else {
      res.status(201).json(savedWine);
    }
  });
});

// get one wine
app.get('/wines/:id', function (req, res) {
  // get wine id from url params (`req.params`)
  var wineId = req.params.id;

  // find wine in db by id
  Wine.findOne({ _id: wineId }, getSingularResponse.bind(res));
});

// update wine
app.put('/wines/:id', function (req, res) {
  // get wine id from url params (`req.params`)
  var wineId = req.params.id;

  // find wine in db by id
  Wine.findOne({ _id: wineId }, function (err, foundWine) {
    if (err) {
      return res.status(500).json({ error: err.message });
    }

    if (!foundWine){
     return res.status(404).json({ error: "Nothing found by this ID." });
    }

    // update the wine's attributes
    foundWine.name = req.body.name;
    foundWine.year = req.body.year;
    foundWine.country = req.body.country;
    foundWine.description = req.body.description;
    foundWine.image = req.body.image;
    foundWine.price = req.body.price;

    // save updated wine in db
    foundWine.save(getSingularResponse.bind(res));
  });
});

// delete wine
app.delete('/wines/:id', function (req, res) {
  // get wine id from url params (`req.params`)
  var wineId = req.params.id;

  // find wine in db by id and remove
  Wine.findOneAndRemove({ _id: wineId }, getSingularResponse.bind(res));
});


// HOME & RESET ROUTES

app.get('/', function (req, res) {
  res.render('site/index');
});

app.get('/reset', function (req, res) {
  res.render('site/reset');
});

app.post('/reset', function (req, res) {
  Book.remove({}, function (err, removedBooks) {
    Book.create(seedBooks, function (err, createdBooks) {
      Wine.remove({}, function (err, removedWines) {
        Wine.create(seedWines, function (err, createdWines) {
          if (req.params.format === 'json') {
            res.status(201).json(createdBooks.concat(createdWines));
          } else {
            res.redirect('/');
          }
        });
      });
    });
  });
});


// listen on port (production or localhost)
app.listen(process.env.PORT || 3000, function() {
  console.log('server started');
});