Why is my rails route is a bit off?

问题

I have my root route

root :to => 'home#index'

which is for my home controller and if i visit http://localhost:3000/ all works great i hit the proper home controller and index action. I then installed this gem rails_admin But when i visit http://localhost:3000/admin i hit the method in my application controller

rescue_from CanCan::AccessDenied do |exception|
  redirect_to root_path, :alert => exception.message
end

and get this error, how is it possible that now i have a routing error...any idea

Routing Error

No route matches {:controller=>"home"}

回答1:

I think the problem lies in that there's no HomeController in the rails_admin engine which has it's own routing, and somehow it stops there (because there's no such controller in the engine). I'd try using:

redirect_to root_url

or even this

redirect_to '/'

This last way means rails doesn't have to try to figure out the path by calling URL for, and might be safer when working with Engines.

回答2:

If you are referencing your app's routes inside your engine or config/initializers/rails_admin.rb, you should prefix it with main_app.

redirect_to main_app.root_path, :alert => exception.message

回答3:

It looks like you don't have your Home Controller defined.

Try adding this above your "root" definition:

resources :home, :only => :index

I'd also suggest reading the official Routes guide on the Rails site.

来源：https://stackoverflow.com/questions/7669780/why-is-my-rails-route-is-a-bit-off