Question

I am a newbie to the ruby on rails platform and I was just trying out couple of example codes.
I was trying to run this example http://goodbadtech.com/2009/05/13/ruby-on-rails-import-csv-data-into-database/
I followed all the instructions but I am getting this error

ActionController::RoutingError (uninitialized constant CsvImportController):

Please help me to bash this error.

Here is my Routes.rb

Imports::Application.routes.draw do
  # The priority is based upon order of creation:
  # first created -> highest priority.
 get "csv_imports/csv_view"
#map.resources :imports
#map.import_proc '/import/proc/:id', :controller => "imports", :action => "proc_csv"
  # Sample of regular route:
  #   match 'products/:id' => 'catalog#view'
  # Keep in mind you can assign values other than :controller and :action

  # Sample of named route:
  #   match 'products/:id/purchase' => 'catalog#purchase', :as => :purchase
  # This route can be invoked with purchase_url(:id => product.id)

    resources :imports
    import_proc '/import/proc/:id', :controller => "csv_imports", :action => "pro_csv"
    end 

  # Sample resource route (maps HTTP verbs to controller actions automatically):
  #   resources :products

  # Sample resource route with options:
  #   resources :products do
  #     member do
  #       get 'short'
  #       post 'toggle'
  #     end
  #
  #     collection do
  #       get 'sold'
  #     end
  #   end

  # Sample resource route with sub-resources:
  #   resources :products do
  #     resources :comments, :sales
  #     resource :seller
  #   end

  # Sample resource route with more complex sub-resources
  #   resources :products do
  #     resources :comments
  #     resources :sales do
  #       get 'recent', :on => :collection
  #     end
  #   end

  # Sample resource route within a namespace:
  #   namespace :admin do
  #     # Directs /admin/products/* to Admin::ProductsController
  #     # (app/controllers/admin/products_controller.rb)
  #     resources :products
  #   end

  # You can have the root of your site routed with "root"
  # just remember to delete public/index.html.
  # root :to => 'csv_imports#csv_view'

  # See how all your routes lay out with "rake routes"

  # This is a legacy wild controller route that's not recommended for RESTful applications.
  # Note: This route will make all actions in every controller accessible via GET requests.
  # match ':controller(/:action(/:id(.:format)))'

Answer 1

Your file, containing the class CsvImportsController should be named csv_imports_controller. I believe that is the error. In your routing, you should have

resources :csv_imports

[EDIT] On the other hand, if your controller is named ImportsController, placed in imports_controller.rb, then inside your routing, you should have

resources :imports

Rails automatically tries to tie things together based on the names. This is what makes things easy if you follow them correctly. So resources :imports will assume there is a controller called ImportsController, which can be found in app/controllers/imports_controller.rb. It is best practice to call the relevant model Import, to be found in app/models/import.rb.

Hope this helps.

(also note that the blog-post you mention is for Rails 2 and not Rails 3)