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.

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. — bernie2436
– bernie2436, Commented Dec 31, 2011 at 4:40

mu is too short · Accepted Answer · 2011-09-24 06:32:18Z

12

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.

answered Sep 24, 2011 at 6:32

mu is too short

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2 Comments

Raj Over a year ago

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

thomasfedb Over a year ago

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

Kick Buttowski · Accepted Answer · 2016-12-12 23:45:49Z

5

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.

edited Dec 12, 2016 at 23:45

Kick Buttowski

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answered Nov 20, 2012 at 17:27

cchapman

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Comments

randomguy · Accepted Answer · 2011-09-24 06:30:53Z

1

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

answered Sep 24, 2011 at 6:30

randomguy

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Comments

Bruno · Accepted Answer · 2013-10-28 23:52:11Z

1

rails generate controller welcome index

answered Oct 28, 2013 at 23:52

Bruno

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1 Comment

Douglas G. Allen Over a year ago

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

Nhat · Accepted Answer · 2014-05-20 03:34:37Z

1

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'

answered May 20, 2014 at 3:34

Nhat

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Comments

Douglas G. Allen · Accepted Answer · 2017-06-12 17:55:14Z

0

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

answered Jun 12, 2017 at 17:55

Douglas G. Allen

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1 Comment

Douglas G. Allen Over a year ago

Years late and thousands short. :-)

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