added back-end mongodb database

Author: Bharanidharan25

app/controllers/noteController.js

@@ -0,0 +1,69 @@
+const Note = require('../models/note')
+
+
+module.exports.listItem = (req,res)=>{
+    Note.find()
+    .then((notes)=>{
+        res.json(notes)
+    })
+    .catch((err)=>{
+        res.json(err)
+    })
+}
+
+
+module.exports.getItem = (req,res)=>{
+    const id = req.params.id
+    Note.findById(id)
+    .then((note)=>{
+        res.json(note)
+    })
+    .catch((err)=>{
+        res.json(err)
+    })
+}
+
+module.exports.postItem = (req,res)=>{
+    const body = req.body
+    const note = new Note({title:body.title,body:body.body})
+    note.save()
+    .then((note)=>{
+        res.json(note)
+    })
+    .catch(err =>{
+        res.json(err)
+    })
+}
+
+module.exports.updateItem = (req,res)=>{
+    const id = req.params.id
+    const body = req.body
+    Note.findByIdAndUpdate(id,body,{new:true})
+    .then(note =>{
+        if(note){
+            res.json(note)
+        }
+        else{
+            res.json({})
+        }
+    })
+    .catch((err)=>{
+        res.json(err)
+    })
+}
+
+
+module.exports.deleteItem = (req,res)=>{
+    const id = req.params.id
+    Note.findByIdAndDelete(id)
+    .then(note=>{
+        if(note){
+            res.json(note)
+        }else{
+            res.json({})
+        }
+    })
+    .catch(err =>{
+        res.json(err)
+    })
+}

app/models/note.js

@@ -0,0 +1,11 @@
+const mongoose = require('mongoose')
+const Schema = mongoose.Schema
+const noteSchema = new Schema({
+    title:{type:String},
+    body:{type:String},
+    createdAt:{type:Date,default:Date.now()}
+})
+
+const Note = mongoose.model('Note',noteSchema)
+
+module.exports = Note

config/database.js

@@ -0,0 +1,13 @@
+const mongoose = require('mongoose')
+
+const connectDB = ()=>{
+    mongoose.connect('mongodb://localhost:27017/notes',{ useNewUrlParser: true, useUnifiedTopology: true})
+    .then(()=>{
+        console.log("Connected to db")
+    })
+    .catch((err)=>{
+        console.log(err)
+    })
+}
+
+module.exports = connectDB

config/routes.js

@@ -0,0 +1,13 @@
+const express = require('express')
+const route = express.Router()
+const noteController = require('../app/controllers/noteController')
+
+route.get('/notes',noteController.listItem)
+route.get('/notes/:id',noteController.getItem)
+route.post('/notes',noteController.postItem)
+route.delete('/notes/:id',noteController.deleteItem)
+route.put('/notes/:id',noteController.updateItem)
+
+
+
+module.exports = route

index.js

@@ -0,0 +1,16 @@
+const express = require('express')
+const route = require('./config/routes')
+const port = 3010
+const app = express()
+app.use(express.json())
+const connectDB = require('./config/database')
+const cors = require('cors')
+
+app.use(cors())
+connectDB()
+app.use('/',route)
+
+
+app.listen(port,()=>{
+    console.log('listening to port',port)
+})