无法获取未定义node.js的方法get

我正在为一个express应用程序编写一种新的结构和可伸缩性。

问题：

我不喜欢在app.js文件中定义每个路由。

解决方案：

使某些内容自动化，以便自动加载路线。

到目前为止，我在index.js（路由文件夹）文件上有以下代码：

var fs = require('fs');
module.exports = function(app) {
  recursive_require(__dirname, app);
  function recursive_require(directory, app) {
    fs.readdirSync(directory).forEach(function(file) {
      if (fs.lstatSync(directory + '/' + file + '/').isDirectory()) {
        var has_no_js_files = false;
        directory = directory + '/' + file + '/'; 
        console.log('Scanning recursively on ' + directory);
        // We run across the directory to check if there are any js files.
        fs.readdirSync(directory).forEach(function(file) {
          console.log('Reading file/directory ' + file);
          if (file.match(/'.js$/g)) {
            has_no_js_files = true;
            console.log('Found js files on directory ' + directory);
          }
        });
        // If the folder has no js files, we take in mind that there are other folders inside
        // so we scan the folder recursively.
        if (!has_no_js_files) {
          console.log('No JS files found on ' + directory + ' going to scan recursively');
          recursive_require(directory.substr(0, directory.lastIndexOf('/')));
        } else {
          // Otherwise, we require the directory taking in mind that we have just js files.
          console.log('Found JS files on ' + directory + ', require them');
          require(directory)(app);
        }
      }
    });
  }
}

现在，这似乎有效，但我有点问题。。

我的想法是把所有东西都放在文件夹上，比如说，这个结构：

routes
  admin
    posts
      index.js <- handles add, remove, edit for posts
    users
      index.js <- handles add, remove, edit for users
  blog
    posts
      index.js <- handles show for frontend
  index.js <- Loads all of the files recursively.

现在，我对这个代码有点问题。。。

我有这个错误：

PS C:'Users'bony-_000'Documents'GitHub'node-blog> node app
Scanning recursively on C:'Users'bony-_000'Documents'GitHub'node-blog'routes/admin/
Reading file/directory posts
No JS files found on C:'Users'bony-_000'Documents'GitHub'node-blog'routes/admin/ going to scan recursively
Scanning recursively on C:'Users'bony-_000'Documents'GitHub'node-blog'routes/admin/posts/
Reading file/directory index.js
Found js files on directory C:'Users'bony-_000'Documents'GitHub'node-blog'routes/admin/posts/
Found JS files on C:'Users'bony-_000'Documents'GitHub'node-blog'routes/admin/posts/, require them
C:'Users'bony-_000'Documents'GitHub'node-blog'routes'admin'posts'index.js:2
  app.get('/admin/posts/add', function(req, res) {
      ^
TypeError: Cannot call method 'get' of undefined

虽然我正在发送应用程序变体…

任何帮助都将不胜感激，也请随时使用代码。