app.js

const express=require("express")
const bodyParser=require("body-parser")
const ejs=require("ejs")
const moongose=require("mongoose")
const req = require("express/lib/request")

const app=express()

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

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

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

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

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

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)
        }
    })
})

// request 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.updateOne(
        {title:req.params.articleTitle},
        {title:req.body.title,content:req.body.content},
        {overwrite:true},
        function(err){
            if(!err){
                res.send("Successfully updated article")
            }
        }
    )
})

.patch(function(req,res){
    Article.updateOne(
        {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");
})