ruby-on-rails - 如何将聊天消息存储到数据库中？

Question

我使用 Node.js 和 Rails 来构建基本的聊天应用程序。现在，当我刷新页面时，所有消息都会被删除。所以我想使用 AJAX 将消息存储在 Rails 数据库中。我怎样才能做到这一点？

nodejs/index.js

console.log("Server is starting...");

const http = require('http');

const hostname = '0.0.0.0';
const port = '8000';

console.log("Creating server...");

const server = http.createServer().listen(port, hostname);

console.log('chat server running on '+ hostname + ':' + port);

let socketList = require('socket.io').listen(server);

socketList.sockets.on('connection', function (socket) {
    console.log('connection received');
    console.log('socket in node = ', socket);

    socket.on('disconnect', function () {
        console.log('socket disconnected');
    });

    socket.on('join_room', function (data) {
        socket.join(data.chatroom);

        socketList.in(data.chatroom).emit('user_joined', {
           user_email: data.user_email,
           chatroom: data.chatroom
        });   
    });

    socket.on('send_message', function (data) {
        console.log(data.message, data.user_email);
        socketList.in(data.chatroom).emit('receive_message', {
            message: data.message,
            user_email: data.user_email
        });
    });
});

rails/application.js

window.addEventListener('load', function (ev) {

    var user_email = $('#current_user_email').html(); // checking if user login

    if(user_email){
        var socket = io.connect('http://0.0.0.0:8000');
        console.log('socket in rails = ' , socket);

        socket.on('connect', function () {
            console.log('connection established to node server');
        });

        socket.emit('join_room',
        {
            user_email: user_email,
            chatroom: 'home'
        });

        socket.on('user_joined', function (data) {
            console.log(data.user_email + ' joined ' + data.chatroom);
        });

        $('#send-message').click(function () {
            let msg = $('#chat-message-input').val();

            if(msg !==''){
                socket.emit('send_message', {
                    message: msg,
                    user_email: user_email,
                    chatroom: 'home'
                });
            }

            $('#chat-message-input').val('');
        });

        socket.on('receive_message', function (data) {
            console.log(data.user_email, data.message);

            let newMessage = $('<li>');
            let messageType = 'other-message';
            if (data.user_email === user_email){
                messageType = 'self-message';
            }
            newMessage.addClass(messageType);

            newMessage.append($('<span>', {
                'html': data.message
            }));
            newMessage.append($('<sub>', {
                'html': data.user_email
            }));

            $('#chat-messages-list').append(newMessage);
        });

还有哪些不同的方法可用于在数据库中存储消息？我们是否也可以使用 Node.js 直接存储在 Rails 数据库中？

Answer 1

不会写代码，但基本上你可以开始:

rails g scaffold Chat name:text chat:text

然后使用 ajax 发布到/chat.json 设置数据，例如 {name:user_name, chat:textxt}

然后你还需要从/chat.json 询问所有用户聊天另外你需要在rails中写索引函数

if params[:id]) do
  @chat = Chat.find(name:username)
else 
  @chat = Chat.all
end

然后向用户显示这些消息但这是让你继续前进的基本概念