app.controller.js

const App = require("../model/app.model.js");

// Create and Save a new Message
exports.create = (req, res) => {
  const message = new App({
    message: req.body.message,
  });
  message
    .save()
    .then((data) => {
      res.send(data);
    })
    .catch((err) => {
      res.status(500).send({
        message:
          err.message || "Some error occurred while creating the Message.",
      });
    });
};

// Retrieve all messages from the database.
exports.findAll = (req, res) => {
  App.find()
    .then((data) => {
      res.send(data);
    })
    .catch((err) => {
      res.status(500).send({
        message:
          err.message || "Some error occurred while retrieving messages.",
      });
    });
};

// ... more CRUD routes like this ...