Routing error in Ruby on Rails 3

Question

I am new to Ruby on Rails I am getting this error

uninitialized constant WelcomeController

after creating the sample project. I enabled

root :to => 'welcome#index'

in routes.rb.

Carine

I also got this error when using the getting started guide: guides.rubyonrails.org/getting_started.html You have to actually change the line to home#index like Mohan Raj says in his comment below. You don't just un-comment the line. – Blower

Answer 1

When you say

root :to => 'welcome#index'

you're telling Rails to send all requests for / to the index method in WelcomeController. The error message is telling you that you didn't create your WelcomeController class. You should have something like this:

class WelcomeController < ApplicationController
  def index
    # whatever your controller needs to do...
  end
end

in app/controllers/welcome_controller.rb.

Thrift

Hi i found the solution just i changed root :to => 'home#index'. I created the controller home. So set route to home. – Carine

@MohanRaj you should accept this answer as correct, as it is. – Yun

Answer 2

I'm very very new to Rails and also ran into this error while following along with Rails Tutorial by Michael Hartl. The problem I had was that in the config/routes.rb file, I just uncommented the root :to => "welcome#index":

# just remember to delete public/index.html.
root :to => "welcome#index"

but with the structure of the sample_app was that "welcome#index" should be 'pages#home' instead, since everything was originally set up through the "pages" controller.

root :to => 'pages#home'

It's even right there in the book, but I just overlooked it and spent quite a while afterwards trying to figure out where I went wrong.

Cohberg

Answer 3

Make sure WelcomeController is defined in a file called welcome_controller.rb

Liggins

Answer 4

rails generate controller welcome index

Ashram

The generator sets the route for you. Rails.application.routes.draw do get 'welcome/index' end – Bailiff

Answer 5

If you not generate the page with name welcome, then just generate the page like: $ rails generate controller pagename index. So then into the: config->routes.rb you should edit root 'welcome#index' to root 'pagename#index'

Recliner

Answer 6

Keep this if you want it to be your context root after you generate your welcome parts.

Rails.application.routes.draw do
  root 'welcome#index'
end

Bailiff

Years late and thousands short. :-) – Bailiff