Flash over ActionCable, a Rails::Engine.
For fancy, SPA-style user notifications, just assign Flash normally in your controllers. FlashCable will intercept them at the middleware layer and deliver them via ActionCable.
Add this line to your application's Gemfile:
gem 'flash-cable'
And then execute:
$ bundle
Assign Flash normally in your controllers. (more details to come..)
Bug reports and pull requests are welcome on GitHub at https://github.com/OutlawAndy/flash-cable.
The gem is available as open source under the terms of the MIT License.