Node.js + MongoDB + Express + Mongoose. How to require all the models in a particular folder by a simple code?

Question

Node.js + MongoDB + Express + Mongoose. How to require all the models in a particular folder by a simple code?

my code in file songs.js

var mongoose = require('mongoose')
, Schema = mongoose.Schema
, ObjectId = Schema.ObjectId;

var SongSchema = new Schema({
name: {type: String, default: 'songname'}
, link: {type: String, default: './data/train.mp3'}
, date: {type: Date, default: Date.now()}
, position: {type: Number, default: 0}
, weekOnChart: {type: Number, default: 0}
, listend: {type: Number, default: 0}
});

mongoose.model('Song', SongSchema);

in file albums.js

  var mongoose = require('mongoose')
, Schema = mongoose.Schema
, ObjectId = Schema.ObjectId;

var AlbumSchema = new Schema({
name: {type: String, default: 'songname'}
, thumbnail: {type:String, default: './images/U1.jpg'}
, date: {type: Date, default: Date.now()}
, songs: [SongSchema]
});
mongoose.model('Album', AlbumSchema);

I can get any model by:

require('mongoose').model(name_of_model);

But how to require all the models in a particular folder by a simple code not by name_of_model? In above example all models in the folder ./models/*

node.js
mongodb
mongoose
models

Answer 1

You have export your model in each of files in "model" folder. For example, do as follows,

exports.SongModel = mongoose.model('Song', SongSchema);

Then create a common file in model folder with name "index.js" and write following line

exports = module.exports = function(includeFile){  
  return require('./'+includeFile);
};

Now, Go to your js file where you need "Song" model and add your module as follows,

var SongModel = require(<some_parent_directory_path>+'/model')(/*pass file name here as*/ 'songs');

For example, If i write the code to list all songs in songslist.js and file placed in parent directory as follows,

|---- models
|-------- songs.js
|-------- albums.js
|-------- other.js
|---- and another files of expressjs
|---- songslist.js

Then you can add "songs model" like

var SongModel = require('./model')('songs');

Note: There are more alternate ways to achieve this.

Answer 2

var models_path = __dirname + '/app/models'
fs.readdirSync(models_path).forEach(function (file) {
  require(models_path+'/'+file)
})

Answer 3

You might use a module such as node-require-all which allows you to require all files from a specific folder (you can even use filter criteria).

To give you an example (taken from the module's readme file):

var controllers = require('require-all')({
  dirname     :  __dirname + '/controllers',
  filter      :  /(.+Controller)\.js$/,
  excludeDirs :  /^\.(git|svn)$/
});

// controllers now is an object with references to all modules matching the filter
// for example:
// { HomeController: function HomeController() {...}, ...}

I think that this should fulfill your needs.