rails 3: Rails Footnotes

1. gem 'rails-footnotes', '>= 3.7', :group => :development

2. create footnotes.rb in initializers

3. insert code :

if defined?(Footnotes) && Rails.env.development?

Footnotes.run! # first of all

# ... other init code

Footnotes::Filter.prefix = 'mvim://open?url=file://%s&line=%d&column=%d'

end