使用Express 4将数组从Nodejs中的app.js传递到route / index.js

Question

How can I pass an array of objects to the routes middle-ware so that I can render the view depending on the variables passed.

Currently, this is the layout I am working with

app.js

var index = require('./routes/index');

ARRAY = [objects];
app.use('/', index);

routes/index.js

var express = require('express');
var router = express.Router();

router.get('/', function(req, res, next){
  res.render('index', {data: ARRAY});
});

module.exports = router;

index.jade

extends layout
block content
  each d in data
    div!= d.method()

Currently the only solution I can produce that actually works is to use global variables, but this is not sustainable or scalable. I have tried app.set('shrinkr', shrinkr); and app.locals but cannot get either of these to work with the layout of my app. From my understanding of the Express4 framework I should be able to do something like this in app.js:

var index = require('./routes/index')(array);

but I cannot get the implementation correct, and there is no info about this on the web.

Answer 1

There are multiple ways that you can tackle this, but if you want to "bake" the array into the middleware (as your code sample suggested), you can do this:

var express = require('express');

module.exports = function(array) {
    var router = express.Router();
    return router.get('/', function(req, res, next){
      res.render('index', {data: array});
    });
}

Then you can use it as you suggested:

var index = require('./routes/index')(array);

Because new middleware is created every time you invoke the exported function, you can bake independent arrays into different middleware:

var index1 = require('./routes/index')(["array 1"]);
var index2 = require('./routes/index')(["array 2"]);

Which may or may not be useful to you, depending on your needs.