app.js

//jshint esversion:6

const express = require("express");
const bodyParser = require("body-parser");
const ejs = require("ejs");
const mongoose = require('mongoose');

const app = express();

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

app.use(bodyParser.urlencoded({
  extended: true
}));
app.use(express.static("public"));

mongoose.connect("mongodb://localhost:27017/wikiDB", {
  useNewUrlParser: true
});

const articleSchema = {
  title: String,
  content: String
};

const Article = mongoose.model("Article", articleSchema);

///////////////////////////////////Requests Targetting all Articles////////////////////////

app.route("/articles")

  .get(function(req, res) {
    Article.find(function(err, foundArticles) {
      if (!err) {
        res.send(foundArticles);
      } else {
        res.send(err);
      }
    });
  })

  .post(function(req, res) {

    const newArticle = new Article({
      title: req.body.title,
      content: req.body.content
    });

    newArticle.save(function(err) {
      if (!err) {
        res.send("Successfully added a new article.");
      } else {
        res.send(err);
      }
    });
  })

  .delete(function(req, res) {

    Article.deleteMany(function(err) {
      if (!err) {
        res.send("Successfully deleted all articles.");
      } else {
        res.send(err);
      }
    });
  });

////////////////////////////////Requests Targetting A Specific Article////////////////////////

app.route("/articles/:articleTitle")

  .get(function(req, res) {

    Article.findOne({
      title: req.params.articleTitle
    }, function(err, foundArticle) {
      if (foundArticle) {
        res.send(foundArticle);
      } else {
        res.send("No articles matching that title was found.");
      }
    });
  })

  .put(function(req, res) {

    Article.update({
        title: req.params.articleTitle
      }, {
        title: req.body.title,
        content: req.body.content
      }, {
        overwrite: true
      },
      function(err) {
        if (!err) {
          res.send("Successfully updated the selected article.");
        }
      }
    );
  })

  .patch(function(req, res) {

    Article.update({
        title: req.params.articleTitle
      }, {
        $set: req.body
      },
      function(err) {
        if (!err) {
          res.send("Successfully updated article.");
        } else {
          res.send(err);
        }
      }
    );
  })

  .delete(function(req, res) {

    Article.deleteOne({
        title: req.params.articleTitle
      },
      function(err) {
        if (!err) {
          res.send("Successfully deleted the corresponding article.");
        } else {
          res.send(err);
        }
      }
    );
  });



app.listen(3000, function() {
  console.log("Server started on port 3000");
});