Can't find a route with an underscore or doesn't treat it properly

Question

I have this in routes:

Rails.application.routes.draw do
  namespace :api do
    namespace :v3_4 do
      # .....

And the controller app/c

Answer 1

Rails inflects _ to be a word separator, so it searches for Api::V34 you can change that behavior by editing config/initializers/inflections.rb:

ActiveSupport::Inflector.inflections(:en) do |inflect|
  inflect.acronym 'V3_4'
end

Moreover, if you want to change Api namespace to API, since it's an acronym, you can do it there as well:

ActiveSupport::Inflector.inflections(:en) do |inflect|
  inflect.acronym 'V3_4'
  inflect.acronym 'API'
end

More info: http://api.rubyonrails.org/classes/ActiveSupport/Inflector/Inflections.html