[Rails] Facebook omniauth nil object

Rails 3.1.3

Gemfile
gem 'authbuttons-rails'
gem 'twitter'
gem 'omniauth-twitter'
gem 'omniauth-facebook'

My app needs Facebook integration, and the similar method works for
Twitter API.
When it comes to Facebook, the create method in services_controller.rb
raises an error

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.[]

app/models/user.rb:47:in `connect_service'
app/controllers/services_controller.rb:18:in `create'

Sorry about the length of the code.

Do you see any problem? I believe that I'm making a stupid mistake
because the code got too long...

# and connect_service method in user.rb is

def connect_service(omniauth)
#set uid and provider
case omniauth['provider']
when 'twitter'
omniauth['uid'] ? uid = omniauth['uid'] : uid = ''
omniauth['provider'] ? provider = omniauth['provider'] :
provider = ''
token = (omniauth['credentials']['token'] rescue nil)
secret = (omniauth['credentials']['secret'] rescue nil)
when 'facebook'
omniauth['extra']['user_hash']['id'] ? uid =
omniauth['extra']['user_hash']['id'] : uid = '' ###HERE!!
omniauth['provider'] ? provider = omniauth['provider'] :
provider = ''
token = (omniauth['credentials']['token'] rescue nil)
secret = ''
end
services.build(:provider => provider, :uid => uid, :token =>
token, :secret => secret)
end


at line 18 where I indicated by putting "###HERE!" in the code
# service controller that creates Twitter and Facebookl things

class ServicesController < ApplicationController
before_filter :authenticate_user!, :except => [:create]

def index
# get all authentication services assigned to the current user
@services = current_user.services.all
end

def create
# get the full hash from omniauth
omniauth = request.env['omniauth.auth']
authentication =
Service.find_by_provider_and_uid(omniauth['provider'], omniauth['uid'])
if authentication.present?
flash[:notice] = "Signed in successfully."
sign_in_and_redirect(:user,authentication.user)
elsif omniauth.present?
if user_signed_in?
current_user.connect_service(omniauth)
if current_user.save
redirect_to services_url, notice: "Authentication
successful."
else
redirect_to root_path, alert: "Error while saving
Authentication information."
end
elsif (omniauth['provider'] == "facebook")
if existinguser =
User.find_by_email(omniauth['extra']['user_hash']['email']) ####HERE!
existinguser.connect_service(omniauth)
if existinguser.save
flash[:notice] = "Signed in successfully."
sign_in_and_redirect(:user,existinguser)
else
redirect_to root_path, alert: "Error while
saving Authentication information."
end
else
session[:omniauth] = omniauth
redirect_to new_user_registration_url
end
else
session[:omniauth] = omniauth.except('extra')
redirect_to new_user_registration_url
end
else
redirect_to root_path, alert: "Error while authenticating."
end
end

def destroy
# remove an authentication service linked to the current user
@service = current_user.services.find_by_id(params[:id])

if @service.present?
@service.destroy
redirect_to services_path, notice: 'Service was successfully
deleted.'
else
redirect_to services_path, alert: 'Service was not found.'
end
end
end


soichi

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