如何在 node.js 中将数据从控制器传递到路由器？

Question

I have folder diagram where i have two files controller and router , Now i have pulled the data from mongodb in controller that i am trying to pass it router so i can send it to client using api but i am failed to get response in router , any idea what is implemented wrong.

I mentioned folder diagram because this router is just for this particular model that will send response regarding diagram only.

diagram.controller.js

var Diagram = require('./diagram.model');
var mongoose = require('mongoose');
module.exports = function index() {
       Diagram.find({}, function(err, res) {
         if (!err) {
           console.log('Response from controller', res);
           return res;
         }
       });
     }

diagram.router.js

var express = require('express');
var controller = require('./diagram.controller');

var router = express.Router();

console.log('THis is in router',controller.index());
router.get('/getAllDiagram',controller.index());

module.exports = router;

Answer 1

You have to modify your code a little bit.

The first aspect that has to be changed is the way how you pass the index function to the router. Please make sure that you don't execute it directly. This function will be called by express when a request hits your server at the particular route.

diagram.router.js

router.get('/getAllDiagram', controller.index);

The next change is in the index function itself. The function gets two parameters by express : req - the request object and res - the response object:

diagram.controller.js

module.exports.index = function index(req, res) {
    Diagram.find({}, function(err, result) {
        if (err) {
            console.error('Something bad happened: ' + err.message);

            return res.status(500);
        }

        console.log('Response from controller', result);
        res.json(result);
    });
};

Please note that I renamed your variable res to result .