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POHow to create my own module of functions in a node.js app
 

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  1. POHow to create my own module of functions in a node.js app
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    <p>I'm building my node.js app which has the following structure:</p> <ul> <li>server.js</li> <li>controllers/user.js</li> </ul> <p>server.js require the user.js controller with:</p> <pre><code>require('./controllers/user.js').route(app, mongoose); </code></pre> <p>the controller/user.js file is like:</p> <pre><code>function route(app, mongoose){ function route(app, mongoose){ // Create new User item app.post('/user/create', function(req, res){ ... } // Edit user app.put('/user/:id/edit', function(req, res){ ... } ... } module.exports.route = route; </code></pre> <p>This is working fine. I know want to had middleware in the Edit user function for instance so it looks like:</p> <pre><code>... app.put('/user/:id/edit', loadUser, function(req, res){ ... </code></pre> <p>If I define loadUser function right above this line it's working fine. When I add all the middleware fonction in a file './lib/middleware.js' and when I try to load that file in user.js with:</p> <pre><code>require('../lib/middleware.js').create(); // Create is the exported function </code></pre> <p>this does not work and I have the error message saying that loadUser is an unknow function.</p> <p>Any idea ?</p> <p>** UPDATE **</p> <p>I have updated the files such that, in server.js (main file) I have:</p> <pre><code>... var middleware = require('./lib/middleware.js'); ... require('./controllers/user.js').route(app, mongoose, middleware); ... </code></pre> <p>In middleware.js, I then have:</p> <pre><code>function create() { function loadUser(req, res, next) { // You would fetch your user from the db var user = users[req.params.id]; if (user) { req.user = user; next(); } else { next(new Error('Failed to load user ' + req.params.id)); } } return module; } </code></pre> <p>In controllers/user.js I have</p> <pre><code>function route(app, mongoose, middleware){ ... // Modify an user app.put('/user/edit', middleware.loadUser, function(req, res){ ... } ... } </code></pre> <p>When I run the app (node server.js) I then have the following error:</p> <pre><code>Error: PUT route /user/edit requires a callback </code></pre> <p>I am not sure to return the correct thing within middleware.js, not really familiar with module stuff yet. I also tried the "module.exports.create = create;" but same thing.</p> <p><strong>UPDATE WITH ANOTHER TRY</strong></p> <p>what if I create a module for the function ? In ./lib/middleware.js I would have:</p> <pre><code>(function(){ var middleware = {}; middleware.loadUser = function () { console.log("loadUser"); } return middleware; }()); </code></pre> <p>And in server, I call it:</p> <pre><code>var middleware = require('./lib/middleware.js'); middleware.loadUser; </code></pre> <p>It seems to me that should work but it does not...</p>
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    1. COsee edit to answer.
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    2. COAs to your second example remember `require` returns `module.exports` not `module` so change it to `module.exports = middleware` instead of `return middleware`. See Edit to answer.
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