Question

I get this error in the browser when I attempt to view localhost:3000/galleries

---

Routing Error

undefined method `sub' for nil:NilClass

---

My log file tells me

ActionController::RoutingError (undefined method ‘sub’ for nil:NilClass)`
  app/controllers/galleries_controller.rb:1:in `<top (required)>'
  Rendered /Users/mikev/.rvm/gems/ruby-1.9.3-head/gems/actionpack-3.1.3/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (0.8ms)

routes.rb

Gallery::Application.routes.draw do
  match 'galleries' => 'galleries#index'  
end

controllers/galleries_controller.rb:

class GalleriesController < ApplicationController
  def index

  end
end

views/galleries/index.html.erb is empty

Any idea what this means?

Answer 1

This problem usually occurs when the router tries to look up a constant name and fails.

Do you have a helper in app/helpers/galleries_helper.rb? If so, does it define GalleriesHelper?