Adds basic social networking capabilities to your existing application, including users, blogs, photos, clippings, favorites, and more.
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** Using Rails 2.x? You want the rails2.x branch

CommunityEngine Build Status

Information at:



Getting CommunityEngine Running

  1. Copy the following into your Gemfile:

    gem 'community_engine'
  2. Add a file called application_config.rb to your config directory. In it put (at least):

     configatron.community_name = "Your Application Name"
     # See CE's application_config.rb to see all the other configuration options available
  3. From your app's root directory run:

     $ bundle install --binstubs
     $ bin/rake community_engine:install:migrations
     $ bin/rake db:migrate
  4. Mount CommunityEngine in your config/routes.rb file:

     mount CommunityEngine::Engine => "/"
  5. Delete the default views/layouts/application.html.erb that Rails created for you. Delete public/index.html if you haven't already.

  6. Start your server!

     $ bin/rails server

Optional Configuration

To override the default configuration, create an application_config.rb file in Rails.root/config

The application configuration defined in this file overrides the one defined in the CommunityEngine gem

This is where you can change commonly used configuration variables, like configatron.community_name, etc.

OmniAuth Configuration:

You can allow users to sign up and log in using their accounts from other social networks (like Facbeook, Twitter, LinkedIn, etc.). To do so, just add an initializer in your app's config/initializers directory called omniauth.rb. In it, put:

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :twitter, 'CONSUMER_KEY', 'CONSUMER_SECRET'
  provider :facebook, 'APP_ID', 'APP_SECRET'
  provider :linked_in, 'CONSUMER_KEY', 'CONSUMER_SECRET'

See the OmniAuth Github repository for more information and configuration options.

Photo Uploading

By default CommunityEngine uses the filesystem to store photos.

To use Amazon S3 as the backend for your file uploads,you'll need to add a file called s3.yml to the application's root config directory (examples are in /community_engine/sample_files).

You'll need to change your configuration in your application_config.rb to tell CommunityEngine to use s3 as the photo backend. For more, see the Paperclip documentation on S3 storage for uploads:

Finally, you'll need an S3 account for S3 photo uploading.


CommunityEngine Users have a Role (by default, it's admin, moderator, or member)

Once logged in as an admin, you'll be able to toggle other users between moderator and member (just go to their profile page and look on the sidebar.)

Admins and moderators can edit and delete other users posts.

There is a rake task to make an existing user into an admin:

rake community_engine:make_admin

(Pass in the e-mail of the user you'd like to make an admin)


Localization is done via Rails native I18n API. We've added some extensions to String and Symbol to let them respond to the .l method. That allows for a look up of the symbol (or a symbolized version of the string).

For complex strings with substitutions, Symbols respond to the .l method with a hash passed as an argument, for example:

:welcome.l :name =>

And in your language file you'd have:

welcome: "Welcome %{name}"

To customize the language, or add a new language create a new yaml file in Rails.root/config/locales. The name of the file should be LANG-LOCALE.yml (e.g. en-US.yml or es-PR). The language only file (es.yml) will support all locales.

Spam Control

Spam sucks. Most likely, you'll need to implement some custom solution to control spam on your site, but CE offers a few tools to help with the basics.

ReCaptcha: to allow non-logged-in commenting and use ReCaptcha to ensure robots aren't submitting comments to your site, just add the following lines to your application_config.rb:

:allow_anonymous_commenting => true,
:recaptcha_pub_key => YOUR_PUBLIC_KEY,
:recaptcha_priv_key => YOUR_PRIVATE_KEY

You can also require ReCaptcha on signup (to prevent automated signups) by adding this in your application_config.rb (you'll still need to add your ReCaptcha keys):

:require_captcha_on_signup => true

Akismet: Unfortunately, bots aren't the only ones submitting spam; humans do it too. Akismet is a great collaborative spam filter from the makers of Wordpress, and you can use it to check for spam comments by adding one line to your application_config.rb:

:akismet_key => YOUR_KEY

Integrating with Your Application & Overriding CE

To make a controller from your application use CE's layout and inherit CE's helper methods, make it inherit from BaseController. For example:

	class RecipesController < BaseController

		before_filter :login_required

		uses_tiny_mce do
			{:only => [:show], :options => configatron.default_mce_options}


To override or modify a controller, helper, or model from CE, you can use the require_from_ce helper method. For example, to override a method in CE's User model, create app/models/user.rb:

	class User < ActiveRecordBase

		#add a new association
		has_many :recipes

		#override an existing method
		def	display_name


Other notes

Any views you create in your app directory will override those in CommunityEngine For example, you could create Rails.root/app/views/layouts/application.html.haml and have that include your own stylesheets, etc.

Contributors - Thanks! :)

  • Bryan Kearney - localization
  • Alex Nesbitt - forgot password bugs
  • Alejandro Raiczyk - Spanish localization
  • Fritz Thielemann - German localization, il8n
  • Oleg Ivanov - acts_as_taggable_on_steroids
  • David Fugere - French localization
  • Barry Paul - routes refactoring
  • Andrei Erdoss localization
  • Errol Siegel simple private messages integration, documentation help
  • Carl Fyffe - documentation, misc.
  • Juan de Frías static pages, photo albums, message_controller tests
  • Joel Nimety authlogic authentication
  • Stephane Decleire i18n, fr-FR locale

Bug tracking is via GitHub Issues