devise + omniauth logout

Question

I finally got "sign in with Facebook" to work with devise/omniauth, but when a user is signed in, the "sign in with facebook" link doesn't change to "sign out" and/or there is no visible sign out option.

here is my route.rb file

devise_for :users, :controllers => {:omniauth_callbacks => "users/omniauth_callbacks", :registrations => 'registrations'}, :path_names => { :sign_in => 'login', :sign_out => 'logout' } do
  get 'login' =>'devise/sessions#new', :as => :new_user_session
  post 'login' => 'devise/sessions#create', :as => :user_session
  get 'signup'  => 'registrations#new', :as => :new_user_registration
  get 'signout' => 'devise/sessions#destroy', :as => :destroy_user_session

end

and here is the user file

class User < ActiveRecord::Base
devise :omniauthable, :omniauth_providers => [:facebook]
def self.find_for_facebook_oauth(auth, signed_in_resource=ni)
user = User.where (:provider => auth.provider, :uid => auth.uid).first
unless user

def self.find_for_facebook_oauth(auth, signed_in_resource=nil)
user = User.where
user = User.create(name:auth.extra.raw_info.name,
                     provider:auth.provider,
                     uid:auth.uid,
                     email:auth.info.email,
                     password:Devise.friendly_token[0,20]
                     )
end
user
end

end

session controller:

class SessionsController < ApplicationController
def create
 user = User.from_omniauth(env["omniauth.auth"])
 session[:user_id] = user.id
 redirect_to root_path
 end

def destroy
 session.delete[:user_id] = nil
 redirect_to root_path
end
end

Omniauth_callbacks_controller:

class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
def facebook
# You need to implement the method below in your model (e.g. app/models/user.rb)
@user = User.find_for_facebook_oauth(request.env["omniauth.auth"], current_user)

if @user.persisted?
  sign_in_and_redirect @user, :event => :authentication #this will throw if @user is not       activated
  set_flash_message(:notice, :success, :kind => "Facebook") if is_navigational_format?
else
  session["devise.facebook_data"] = request.env["omniauth.auth"]
  redirect_to new_user_registration_url
end
end
end

and lastly, the application layout

<% if current_user %>
      Signed in as <strong><%= current_user.name %></strong>!
      <%= link_to "Sign out", destroy_user_session, id: "sign_out" %>
    <% else %>
  <li><%= link_to "Sign in with Facebook", user_omniauth_authorize_path(:facebook) %></li>
  <% end %>

Not quite sure waht i keep doing wrong or why I'm having a hard time looking for the answer, so I thought it might be easier to just put up the code. I"m new at this, so any help is appreciated. Thanks!

Answer 1

Short Answer - current_user is nil so your not actually logged in.

If "Sign in with Facebook" is still showing, and Sign Out is not showing, i'm assuming the "Signed in as" Is also not showing.

This is most likely due to this current_user not being set, so this line is failing

<% if current_user %>

and so this code gets triggered

<li><%= link_to "Sign in with Facebook", user_omniauth_authorize_path(:facebook) %></li>

So I am assuming current_user is not actually getting set, therefore you're not really logged in. You can add the devise controller filter authenticate_user! to see if you're logged in or not. Something like

class ApplicationController
  before_filter :authenticate_user!
end

Which will redirect you if you are not logged in.

Use Pry To Find Out

Pry is a great tool for debugging these kinds of things

To debug with pry, you would add to your Gemfile

group :development do
  gem "pry", "~> 0.9.12.4"
end

and run bundle install

you can then add this to your code

<%= binding.pry %>
<% if current_user %>
  Signed in as <strong><%= current_user.name %></strong>!
  <%= link_to "Sign out", destroy_user_session, id: "sign_out" %>
<% else %>
  <li><%= link_to "Sign in with Facebook", user_omniauth_authorize_path(:facebook) %></li>
<% end %>

Go through your normal Login with Facebook workflow, and the Rails Server in your terminal will 'stop' at the `<% binding.pry %> and allow you to run commands, including checking variables.

In the terminal your rails console is running in, you should see something like

current_user ? "There is a current user set" : "No current user is set"

You may also just run

current_user

but the former has more verbose output. Some other useful debugging commands include

help whereami exit !!!