16-express-chat-mongo/app.js

const mongoose = require("mongoose");
const express = require("express");
const Schema = mongoose.Schema;
const app = express();
const jsonParser = express.json();
 
const userScheme = new Schema({name: String, message: String}, {versionKey: false});
const UserMessage = mongoose.model("UserMessages", userScheme);
 
app.use(express.static(__dirname + "/public"));
 
mongoose.connect("mongodb://localhost:27017/messagesDB", { useUnifiedTopology: true, useNewUrlParser: true}, function(err){
    if(err) return console.log(err);
    app.listen(3001, function(){
        console.log("Сервер ожидает подключения...");
    });
});
  
app.get("/api/messages", function(req, res){
        
  UserMessage.find({}, function(err, messages){
 
        if(err) return console.log(err);
        res.send(messages)
    });
});
 
app.get("/api/messages/:id", function(req, res){
         
    const id = req.params.id;
    UserMessage.findOne({_id: id}, function(err, messages){
          
        if(err) return console.log(err);
        res.send(messages);
    });
});
    
app.post("/api/messages", jsonParser, function (req, res) {
        
    if(!req.body) return res.sendStatus(400);
        
    const userName = req.body.name;
    const userMessage = req.body.message;
    const userMessageItem = new UserMessage({ name: userName, message: userMessage});
        
    

    userMessageItem.save(function(err){
        if(err) return console.log(err);
        res.send(userMessageItem);
    });
});
     
app.delete("/api/messages/:id", function(req, res){
         
    const id = req.params.id;
    UserMessage.findByIdAndDelete(id, function(err, message){
                
        if(err) return console.log(err);
        res.send(message);
    });
});
    
app.put("/api/messages", jsonParser, function(req, res){
         
    if(!req.body) return res.sendStatus(400);
    const id = req.body.id;
    const userName = req.body.name;
    const userMessage = req.body.message;
    const newMessageItem = {message: userMessage, name: userName};
     
    UserMessage.findOneAndUpdate({_id: id}, newMessageItem, {new: true}, function(err, message){
        if(err) return console.log(err); 
        res.send(message);
    });
});