backbone-couchdb

This is a Backbone.js connector that overrides Backbone's default sync-behavior and connects your app to your CouchDB so that you can RELAX and don't need to worry about (real-time) server-side code.

Demos

• Real time chat with support for private messages. (source in /chat_example)
• Real time comments. (source in /comments_example)

Changelog

• 1.1

  • Fixed a bug with empty key param

• 1.0

  • CoffeeScript rewrite
  • Support for custom filter functions
  • Chat example (including tests)
  • Backbone 5.1 support
  • Various bugfixes
  • Started versioning ;)

Dependencies (already included in the examples)

• Backbone.js (>= 0.5.1)
• Underscore.js
• jquery.couch.js
• jQuery

Why a new connector?

I developed this connector because I didn't want to write a whole new server that persists the models that Backbone.js creates. Instead of writing a server you now only have to write a simple design document containing one simple view and you're done with server-side code and can fully concentrate on the Backbone App.

Also I wanted to get real time updates when my models are changed on the server (e.g. by a second user). The CouchDB _changes feed seemed like a perfect match for this problem.

Getting Started

All Backbone apps should work normally without any changes. Simply include backbone-couchdb.js with its dependencies into your project and configure the connector with your database infos.

Backbone.couch_connector.config.db_name = "backbone-couchapp";
Backbone.couch_connector.config.ddoc_name = "backbone-couchapp";
Backbone.couch_connector.config.global_changes = false;

As you can see you also need to create a new database in your CouchDB and a new design document that contains the following view:

function(doc) {
    if (doc.collection) {
        emit(doc.collection, doc);
    }
}

If you set Backbone.couch_connector.config.global_changes to true, the connector will automatically update your models with remote changes in near real time.

Give your couchapp some backbone

An easy way to host single-page apps is to enclose them in a couchapp. I included a sample couchapp project (/chat_example) to show you how to create couchapps with Backbone and this CouchDB connector. You can also use it as a bare couchapp directory structure for new projects.

There is an instance of this couchapp running on iriscouch.com (demo) and I uploaded a file with the annotated source of the app. (Created with docco)

Learn more

To show how backbone-couchdb works under the hood I created an annotated source file located here.