index.js

const express = require("express");
const app = express();
const mongoose = require("mongoose");
const path = require("path");  
const Chat = require("./models/chat.js"); 
const methodOverride = require("method-override");

app.set("views" , path.join(__dirname,"/views"));
app.set("view engine" , "ejs");
app.use(express.static(path.join(__dirname , "public" )));
app.use(express.urlencoded({extended:true}));
app.use(methodOverride("_method"));

main()
.then(() => {
    console.log("Connected Succesfully!!");
})
.catch((err) => {
    console.err(err);
})

async function main() {
  await mongoose.connect('mongodb://127.0.0.1:27017/whatsapp');
}

//Index route
app.get("/chats", async (req,res) => {
  let chats = await Chat.find();
  console.log(chats);
  res.render("index.ejs" ,{chats} );
});

//new form route
app.get("/chats/new" , (req,res) => {
   res.render("form.ejs");
})

//create route
app.post("/chats" , (req,res) => {
  let {from , To , msg} = req.body;
   let newChat = new Chat({
    from : from,
    To : To,
    msg : msg ,
    created_at : new Date()
   });
   newChat
   .save()
   .then(res => {console.log("chat was saved")})
   .catch(err => {console.err(err)});
   res.redirect("/chats");
})

//edit route
app.get("/chats/:id/edit" ,  async (req,res) => {
  
  let {id} = req.params;
  let chat = await Chat.findById(id);
  
  res.render("edit.ejs" , {chat});
})

//update route
app.put("/chats/:id" , async (req , res) => {
  let {id} = req.params;
  let { msg : newMsg } = req.body;
  let updateChat = await Chat.findByIdAndUpdate(
    id , 
    {msg : newMsg} , 
    {runValidators : true , new : true}
  );
  console.log(updateChat);
  res.redirect("/chats")
})

//delete route
app.delete("/chats/:id" , async (req , res) => {
  let {id} = req.params;
  let deletedchat = await Chat.findByIdAndDelete(id);
 console.log(deletedchat);
  res.redirect("/chats");
})

//home route
app.get("/" , (req,res) => {
    res.send("Working");
});

app.listen(8080,() => {
    console.log("Listening to port 8080");
})