Question

I am working on a rails app that allows users to log in via facebook/twitter/linkedin using omniauth. So far, users are able to sign up and create an account using the authentications, but they must pass validations and are therefore forwarded to a signup page where they must enter a valid name, username, and email. I want these fields to be already filled out if possible using the request.env[“omniauth.auth”] hash.

Here is my code:

authentications_controller.rb

user = User.new 
user.apply_omniauth(omniauth)

if user.save
  flash[:notice] = "Signed in successfully."
  sign_in_and_redirect(:user, user)
else 
  session[:omniauth] = omniauth.except('extra')
  redirect_to new_user_registration_url
end

registrations_controller.rb:

def build_resource(*args)
  super
  if session[:omniauth]
    @user.apply_omniauth(session[:omniauth])
    @user.valid?
  end
 end

user.rb:

def apply_omniauth(omniauth)
  self.name = omniauth['user_info']['name'] if name.blank?
  self.email = omniauth['user_info']['email'] if email.blank?
  authentications.build(:provider => omniauth['provider'], :uid => omniauth['uid'])
end

The line:

self.email = omniauth['user_info']['email'] if email.blank?

results in this NoMethodError:

undefined method `[]' for nil:NilClass

The session[:omniauth] is being passed from the registrations controller to omniauth in the apply_omniauth method. How do I access the name and email in this session?

Thanks

Answer 1

1. Quick answer:

   omniauth.info.email # which is the same as omniauth['info']['email']
   

2. Explanatory answer:

   Put this as the first line of your callback controller:

   render :text => "<pre>" + env["omniauth.auth"].to_yaml and return    
   

   Now try to login and you’ll be able to take a good look at the hash of nested hashes returned.