rake routes says route exists but error message says otherwise - ruby-on-rails

Question

I'm following along with a Railscast http://railscasts.com/episodes/235-devise-and-omniauth-revised?view=comments about implementing omniauth into devise, specifically adding Twitter signin. When I add the link to sign into Twitter to my app, I'm getting this error visiting the homepage
<li><%= link_to "Sign In With Twitter", user_omniauth_authorize_path(:provider) %></li>
No route matches {:controller=>"omniauth_callbacks", :action=>"passthru", :provider=>:provider}
If I do rake routes (see below), it shows that I have 'user_omniauth_callback' route, but it doesn't specify a request type (GET, POST) etc, which I'm not sure is significant or not.
I searched this error on SO, and one person had a similar problem that resulted from not including the following code in routes.rb, but I have it included.
devise_for :users, path_names: {sign_in: "login", sign_out: "logout"},
controllers: {omniauth_callbacks: "omniauth_callbacks"}
The error arose before getting to the part of the episode where he adds the omniauth controller; I added it just to be sure but I'm still getting the same error:
class OmniauthCallbacksController < Devise::OmniauthCallbacksController
def all
request.env["omniauth.auth"]
end
alias_method :twitter, :all
end
I'm not really sure what else I can look at. In the devise initializer, I set up config for Twitter
config.omniauth :twitter, ENV["TWITTER_KEY"], ENV["TWITTER_SECRET"]
This is my user model
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :token_authenticatable, :confirmable,
# :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable, :omniauthable,
:recoverable, :rememberable, :trackable, :validatable
attr_accessible :email, :password, :password_confirmation, :remember_me, :name, :image, :provider, :uid
validates_uniqueness_of :name, :email, :case_sensitive => false
end
Can you make any suggestions about what I might do to fix this problem?
Rake Routes
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_omniauth_authorize /users/auth/:provider(.:format) devise/omniauth_callbacks#passthru {:provider=>/twitter/}
user_omniauth_callback /users/auth/:action/callback(.:format) devise/omniauth_callbacks#(?-mix:twitter)
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy

Answer 1

The mistake was that I was passing :provider rather than :twitter as an argument in the link.
Incorrect
<%= link_to "Sign In With Twitter", user_omniauth_authorize_path(:provider) %>
Correct:
<%= link_to "Sign In With Twitter", user_omniauth_authorize_path(:twitter) %>