ruby-on-rails-plugins

I have seen many sites which provide the whole list of Rails plugins , Ruby libraries and Ruby gems , but we hardly use few of them and some may not suit our requirement and we spend a whole lot of time searching for useful Plugins which suits our requirement. I have created this poll, people can post useful libraries, gems and plugins which they have come across. It would be great help for newbies like me and to the entire Ruby on Rails community . Note: to keep this poll as useful as possible, please remember: Post only one library, gem, or plugin per answer Mention the name of the library,

Can someone help me understand the differences between a Rails Engine and a Mountable app? In Rails 3.1, you can create either one with the "rails new plugin _ __ " command. rails plugin new forum --full # Engine rails plugin new forum --mountable # Mountable App When would you want to use one versus the other? I know you can package an Engine as a gem, for one. Is that not the case for Mountable Apps? What other differences are there? astjohn I have noticed the following: Full Engine With a full engine, the parent application inherits the routes from the engine. It is not necessary to specify

I'm upgrading to Rails 3.2, and running rake db:migrate gives me several errors of the form: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/01/04/rails-3-2-0-rc2-has-been-released . (called from at /app/Rakefile:7) What's perplexing is that my vendor/plugins directory is empty -- is there another plugins