Rails::Engine

Rails::Engine allows you to wrap a specific Rails application or subset of functionality and share it with other applications or within a larger packaged application. Since Rails 3.0, every Rails::Application is just an engine, which allows for simple feature and application sharing.

Any Rails::Engine is also a Rails::Railtie, so the same methods (like rake_tasks and generators) and configuration options that are available in railties can also be used in engines.

Creating an Engine

In Rails versions prior to 3-0, your gems automatically behaved as engines, however, this coupled Rails to Rubygems- Since Rails 3-0, if you wa