"uninitialized constant Users (NameError)" w/ Heroku deploy - ruby-on-rails-3

Question

I've built a basic Rails app with Mongoid, Devise and Omniauth for Facebook login. I've got no problem running it locally, but when I try to push to Heroku, I'm getting this error:
"/app/app/controllers/Users/omniauth_callbacks_controller.rb:1:in `': uninitialized constant Users (NameError)"
I've Googled the hell out of this with little luck. I've committed the User model, I've ran "heroku run rake db:migrate", etc. No luck. Here's my stack.
Ruby 1.9.2
Rails 3.2.1
Gemfile:
require 'rbconfig'
HOST_OS = RbConfig::CONFIG['host_os']
source 'https://rubygems.org'
gem 'rails', '3.2.1'
group :assets do
gem 'sass-rails', '~> 3.2.3'
gem 'coffee-rails', '~> 3.2.1'
gem 'uglifier', '>= 1.0.3'
end
gem 'jquery-rails'
gem "bson_ext", ">= 1.6.1"
gem "mongoid"
gem "devise"
gem "zurb-foundation"
gem "omniauth"
gem 'omniauth-facebook'
gem 'gravatar_image_tag'
Gemfile.lock:
GEM
remote: https://rubygems.org/
specs:
actionmailer (3.2.1)
actionpack (= 3.2.1)
mail (~> 2.4.0)
actionpack (3.2.1)
activemodel (= 3.2.1)
activesupport (= 3.2.1)
builder (~> 3.0.0)
erubis (~> 2.7.0)
journey (~> 1.0.1)
rack (~> 1.4.0)
rack-cache (~> 1.1)
rack-test (~> 0.6.1)
sprockets (~> 2.1.2)
activemodel (3.2.1)
activesupport (= 3.2.1)
builder (~> 3.0.0)
activerecord (3.2.1)
activemodel (= 3.2.1)
activesupport (= 3.2.1)
arel (~> 3.0.0)
tzinfo (~> 0.3.29)
activeresource (3.2.1)
activemodel (= 3.2.1)
activesupport (= 3.2.1)
activesupport (3.2.1)
i18n (~> 0.6)
multi_json (~> 1.0)
addressable (2.2.7)
arel (3.0.2)
bcrypt-ruby (3.0.1)
bson (1.6.1)
bson_ext (1.6.1)
bson (~> 1.6.1)
builder (3.0.0)
coffee-rails (3.2.2)
coffee-script (>= 2.2.0)
railties (~> 3.2.0)
coffee-script (2.2.0)
coffee-script-source
execjs
coffee-script-source (1.2.0)
devise (2.0.4)
bcrypt-ruby (~> 3.0)
orm_adapter (~> 0.0.3)
railties (~> 3.1)
warden (~> 1.1.1)
erubis (2.7.0)
execjs (1.3.0)
multi_json (~> 1.0)
faraday (0.7.6)
addressable (~> 2.2)
multipart-post (~> 1.1)
rack (~> 1.1)
gravatar_image_tag (1.0.0)
hashie (1.2.0)
hike (1.2.1)
i18n (0.6.0)
journey (1.0.3)
jquery-rails (2.0.2)
railties (>= 3.2.0, < 5.0)
thor (~> 0.14)
json (1.6.6)
mail (2.4.4)
i18n (>= 0.4.0)
mime-types (~> 1.16)
treetop (~> 1.4.8)
mime-types (1.18)
mongo (1.6.1)
bson (~> 1.6.1)
mongoid (2.4.7)
activemodel (~> 3.1)
mongo (~> 1.3)
tzinfo (~> 0.3.22)
multi_json (1.2.0)
multipart-post (1.1.5)
oauth2 (0.5.2)
faraday (~> 0.7)
multi_json (~> 1.0)
omniauth (1.0.3)
hashie (~> 1.2)
rack
omniauth-facebook (1.2.0)
omniauth-oauth2 (~> 1.0.0)
omniauth-oauth2 (1.0.0)
oauth2 (~> 0.5.0)
omniauth (~> 1.0)
orm_adapter (0.0.7)
polyglot (0.3.3)
rack (1.4.1)
rack-cache (1.2)
rack (>= 0.4)
rack-ssl (1.3.2)
rack
rack-test (0.6.1)
rack (>= 1.0)
rails (3.2.1)
actionmailer (= 3.2.1)
actionpack (= 3.2.1)
activerecord (= 3.2.1)
activeresource (= 3.2.1)
activesupport (= 3.2.1)
bundler (~> 1.0)
railties (= 3.2.1)
railties (3.2.1)
actionpack (= 3.2.1)
activesupport (= 3.2.1)
rack-ssl (~> 1.3.2)
rake (>= 0.8.7)
rdoc (~> 3.4)
thor (~> 0.14.6)
rake (0.9.2.2)
rdoc (3.12)
json (~> 1.4)
sass (3.1.15)
sass-rails (3.2.5)
railties (~> 3.2.0)
sass (>= 3.1.10)
tilt (~> 1.3)
sprockets (2.1.2)
hike (~> 1.2)
rack (~> 1.0)
tilt (~> 1.1, != 1.3.0)
thor (0.14.6)
tilt (1.3.3)
treetop (1.4.10)
polyglot
polyglot (>= 0.3.1)
tzinfo (0.3.32)
uglifier (1.2.4)
execjs (>= 0.3.0)
multi_json (>= 1.0.2)
warden (1.1.1)
rack (>= 1.0)
zurb-foundation (2.2.0.2)
jquery-rails (>= 1.0)
rails (~> 3.1)
PLATFORMS
ruby
DEPENDENCIES
bson_ext (>= 1.6.1)
coffee-rails (~> 3.2.1)
devise
gravatar_image_tag
jquery-rails
mongoid
omniauth
omniauth-facebook
rails (= 3.2.1)
sass-rails (~> 3.2.3)
uglifier (>= 1.0.3)
zurb-foundation
Controller:
class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
def facebook
# You need to implement the method below in your model
#user = User.find_for_facebook_oauth(request.env["omniauth.auth"], current_user)
if #user.persisted?
flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Facebook"
sign_in_and_redirect #user, :event => :authentication
else
session["devise.facebook_data"] = request.env["omniauth.auth"]
redirect_to new_user_registration_url
end
end
end
Any thoughts ?

Answer 1

I had this issue; I know it's a late answer but I wanted to add this for whoever needed it.
Make sure that your OmniauthCallbacksController IS IN A users FOLDER. "app/controllers/users/omniauth_callbacks_controller.rb"

Answer 2

Just thought I'd add that I had this issue and that the above solutions didn't work for me. It turns out the cause in my case was that Devise had capitalized the Users subfolder's name (/app/app/controllers/Users). Deleting the folder from git and then readding it with the proper lowercase name of "users" (/app/app/controllers/users) solved my issue.

Answer 3

Unlikely, but if you used "rails generate scaffold", or "rails generate controller" to create the controller, you need to "git add -A" to add all the newly created files to your repository. (1) git add -A (2) git commit -m "new files added" (3) git push [assuming you're also using a remote repo] (4) git push heroku master (5) heroku run rake db:migrate
This would be a "Rookie Mistake", but would explain the error above. Don't ask how I know!