rest full service in express web application - node.js

Question

I have to implement a express web application to use rest services with mongodb.
my DBConfig.js file is like below which include my db schema,
var Mongoose = require("mongoose");
const Schema = Mongoose.Schema;
const UserSchema = new Schema({
name : {
type: String,
require: true
},
address : {
type: String,
require: false
},
password: {
type: String,
require: true
}
});
Mongoose.model('User', UserSchema);
Mongoose.connect("mongodb://localhost:27017/demo", function (err) {
if (err) {
console.log(err);
process.exit(-1);
}
console.log("Connected");
});
module.exports = Mongoose;
all the relevant methods are implement in my Controller.js file
var Mongoose = require("../DBSchema/DBConfig");
var UserSchema = Mongoose.model('User');
var Controller = function() {
this.insertUser = function (data) {
return new Promise(function(resolve, reject) {
var User = new UserSchema({
name: data.name,
address: data.address,
password: data.password
});
User.save().then(function () {
resolve({status: 200, message: "User inserted successfully"})
}).catch(function (err) {
reject({status: 500, message: "Error:- " + err})
});
});
}
this.getAll = function () {
return new Promise(function (resolve, reject) {
UserSchema.find().exec().then(function (data) {
resolve({status: 200, Userdata: data})
}).catch(function (err) {
resolve({status: 500, message : "No data available"})
})
})
}
this.getuser = function (id) {
return new Promise(function (resolve, reject) {
UserSchema.find({_id: id}).exec().then(function (data) {
resolve({status: 200, userSearched: data});
}).catch(function (err) {
reject({status: 404, message: "User NOT FOUND"});
})
})
}
this.updateUser = function (id, data) {
return new Promise(function (resolve, reject) {
UserSchema.update({_id: id}, data).then(function (data) {
resolve({status: 200, message: "User updated successfully"})
}).catch(function (err) {
reject({status: 500, message: "Error:- " + err})
})
})
}
this.remove = function (id) {
return new Promise(function (resolve, reject) {
UserSchema.remove({_id: id}).then(function () {
resolve({status: 200, message: "Successfully deleted"})
}).catch(function (err) {
resolve({status: 500, message: "Error : "+err})
})
})
}
}
module.exports = new Controller();
now I have to call my rest services,I want to know how can I use these methods which are in my controller to access data.
I'm using postman to view my data.
the output should be
{
"data": [
{
"_id": "5cf724a58c9b061ba062a28c",
"name": "name1",
"address": "adress1",
"password": "password1",
"__v": 0
}
]
}

Answer 1

All you need is you have to define the routes in your URL to access relevant method, example I create a file called User.Routes.js under a folder called UserController which you can add your Controller.js file also to arrange in an order to get a clear idea. and also assume you add your DBConfig.js file under folder called DBSchema, which made you to do good code practise.
var Express = require('express');
var router = Express.Router();
var Controller = require('./Controller')
router.get('/',function (req,res) {
Controller.getAll().then(function (data) {
res.status(data.status).send({data:data.Userdata})
});
});
router.get('/:id',function (req,res) {
Controller.getuser(req.params.id).then(function (data) {
res.status(data.status).send({data:data.userSearched});
});
});
router.post('/',function(req,res){
Controller.insertUser(req.body).then(function (data) {
res.status(data.status).send({message: data.message});
}).catch(function (err) {
res.status(err.status).send({message: err.message});
});
});
router.put('/:id',function (req,res) {
Controller.updateUser(req.params.id,req.body).then(function (data) {
res.status(data.status).send({message: data.message});
});
});
router.delete('/:id', function (req,res) {
Controller.remove(req.params.id).then(function (data) {
res.status(data.status).send({message: data.message});
});
});
module.exports = router;
and now you need to use methods in your User.Routes.js via postman. for that you need to give url name to be accessed. example, I create Routes.js file
const Express = require("express");
var Routes = Express.Router();
var UserRoute = require('./UserController/User.Route');
Routes.use('/user/', UserRoute);
module.exports = Routes;
like this if you want to view data from your schema you have to add the url like -"http://localhost:8083/user"
and your app.js file want to require the created Routes file for that you can do like,
const Express = require("express");
const app = Express();
const BodyParser = require("body-parser");
const Routes = require("./Routes");
app.use(BodyParser.json());
app.use("/", Routes);
app.listen(8083, "localhost", function(err) {
if (err) {
console.log(err);
process.exit(-1);
}
console.log("Server listening on port 8083");
});
Now using postman you can add user,update and delete particular user by giving user id in your URL like - "http://localhost:8083/user/5cf724a58c9b061ba062a28c"