How to create server Nodejs with express and mongoose

1- Npm init 2- npm i express mongoose 3- npm i --save-dev nodemon

Create server for API

In nodejs with Express you can create server is easy, only need this several lines code:

const express = require('express');

// create the server
const app = express();

// Port and run
app.listen(4000, () => {
    console.log("server run");
})

Connect the MongoDB / mongoose

First import Mongoose in nodejs>

const mongoose = require('mongoose');

Second you need connect with you database in mongoose>

//Connect Mongoose
mongoose.Promise = global.Promise;
mongoose.connect('mongodb://localhost/hospital', {
    userNewUrlParser: true,
    useUnifiedTopology: true,
    useFindAndModify: false
});

Create Models for you database

The models interact with the database, sending, deleting records:

First we import mongoose and Schema (It serves to create the structure of the data)

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

Second, we create our scheme for our patients> (trim is to eliminate the spaces)

const patientsSchema = new Schema({
    nombre: {
        type: String,
        // trim delete spaces in white
        trim: true
    },
    owner: {
        type: String,
        trim: true
    },
    date: {
        type: String,
        trim: true
    },
    hour: {
        type: String,
        trim: true
    },
    symptoms: {
        type: String,
        trim: true
    }
});

module.exports = mongoose.model('Patients', patientsSchema);

Create controllers

// req> request / res> respond / next> next
// When create new patients
exports.newPatients = (req, res, next) => {
    // All : insert in the data base

    // Send respond a the API
    res.json({ message: 'The patients was added properly'});

}

Create routing in nodejs

First we import express and router

Second you need add our controllers, and send data through method POST

const express = require('express');
const router = express.Router();
const patientsControllers = require('../controllers/patientsControllers');


module.exports = function(){

    // Add new patients from POST
    router.post('/patients',
        patientsControllers.newPatients
    )


    return router;
}

Later add Routing in index.js of our server with nodejs

// Add routing
app.use('/', routes());

Send request to the server and Read the request with BodyParser

With Postman you can acces in the url localhost:4000/patients

For read the request you need body-parser>

With post man send the request, in the controller you only write console.log(req.body);

Save date in database, add models

First you need add the models

const Patients = require('../models/Patients');

Second save the models in the mongodb

// Create the object with date of patients from req.body
    const  patients = new Patients(req.body);

    try {
        await patients.save();   
        // Send respond a the API
        res.json({ message: 'The patients was added properly'});
        
    } catch (error){
        console.log(error);
        // with next, is for pass the next function
        next();
    }

Get the records

First in the routing>

// Get the all records from DB
    router.get('/patients',
        patientsControllers.getPatients
    )

Second add controller>

// Get all Patients

exports.getPatients = async (req, res, next) => {

    try{

        const patients = await Patients.find({});
        res.json(patients);

    }catch (error){
        console.log(error);
        next();
    }

}

Get record for id

// Get Patient for ID

exports.getPatient = async (req, res, next) => {

    try{

        const patient = await  Patients.findById(req.params.id);
        res.json(patient);

    }catch (error){
        console.log(error);
        next();
    }

}

Update a records

// Update register with ID
exports.updatePatient = async (req, res, next) => {

    try{
        const patient = await Patients.findOneAndUpdate({_id : req.params.id}, req.body, {
            new : true
        });
        res.json(patient);
    }catch (error){
        console.log(error);
        next();
    }

}

Delete a record

//  Delete register with ID
exports.deletePatient = async (req, res, next) => {

    try{
        
        await Patients.findOneAndDelete({_id : req.params.id});
        res.json({message : 'The Patient was eliminated'});
    }catch (error){
        console.log(error);
        next();
    }

}

Creating the Frontend / Reactjs

First you need use the command>

npx create-react-app frontend

g4brieljs/Appointments-for-patients-nodejs-reactjs