NoMethodError - undefined method - ruby-on-rails-3

Question

I'm having problems displaying data from a separate controller. I have a number of users, each with many pages. I've followed this tutorial with a few minor adjustments.
The error that keeps appearing is:
NoMethodError in SitesController#show
undefined method `page' for #<ActionDispatch::Request:0x00000102452d30>
My routes.rb is as follows:
devise_for :users
resources :users, :only => [:index, :show] do
resources :pages, :shallow => true
end
match '/' => 'sites#show', :constraints => { :subdomain => /.+/ }
root :to => "home#index"
And I have a sites controller:
class SitesController < ApplicationController
def show
#site = Site.find_by_name!(request.page)
end
end
I've also tried:
def show
#site = Site.find_by_name!(params[:site])
end
Which gives a different error.
Am totally stuck trying to figure this out!
Looking forward to your assistance.
Bob

Answer 1

The problem is here: request.page
The request object is of the class ActionDispatch::Request, which does not have a page method.
To track down errors like this, you can try either looking at the docs or messing around in the debugger.
Try running your controller with --debugger enabled.
If you are running Ruby 1.8, install the ruby-debug gem.
If you are running Ruby 1.9, install the ruby-debug19 gem.
Add a debugger call here:
class SitesController < ApplicationController
def show
debugger
#site = Site.find_by_name!(request.page)
end
end
Run your server with the --debugger option.
See what p request.page does. I bet it will have an "undefined method" error, just you see when you try to view that controller action.
If you do a p request.class you can find out what class the object is, and then look up the docs to see how to use it.