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PODisplaying Facebook info of logged out user
 

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    <p>Creating a Rails app that interacts heavily with Facebook. I want to users to be able to look at profiles of other users and see information on those users that has been pulled in from Facebook.</p> <p>I'm using the omniauth-facebook and koala gems. I followed Ryan Bates' Railscasts on Facebook authentication and Facebook Graph API to get where I'm at.</p> <p>I would prefer not to have to store a user's Facebook info in my database, but that seems to be the only way of doing it, because otherwise, when I try to view the profile page of another user who may have logged out, I get: "Koala::Facebook::AuthenticationError in Profiles#show" <code>type: OAuthException, code: 190, error_subcode: 467, message: Error validating access token: The session is invalid because the user logged out. [HTTP 400]</code>.</p> <p>Is there a way to bring in this data from Facebook, even if that user has logged out?</p> <p>Here's the necessary code:</p> <p>user.rb:</p> <pre><code>class User &lt; ActiveRecord::Base def self.from_omniauth(auth) where(auth.slice(:provider, :uid)).first_or_initialize.tap do |user| user.provider = auth.provider user.uid = auth.uid user.name = auth.info.name user.image = auth.info.image user.oauth_token = auth.credentials.token user.oauth_expires_at = Time.at(auth.credentials.expires_at) user.save! end end def facebook @facebook ||= Koala::Facebook::API.new(oauth_token) block_given? ? yield(@facebook) : @facebook rescue Koala::Facebook::APIError logger.info e.to_s nil end end </code></pre> <p>sessions_controller.rb</p> <pre><code>class SessionsController &lt; ApplicationController def create user = User.from_omniauth(env["omniauth.auth"]) session[:user_id] = user.id redirect_to feed_path end def destroy session[:user_id] = nil redirect_to root_url end end </code></pre> <p>application_controller.rb</p> <pre><code>class ApplicationController &lt; ActionController::Base protect_from_forgery private def current_user @current_user ||= User.find(session[:user_id]) if session[:user_id] rescue ActiveRecord::RecordNotFound end helper_method :current_user end </code></pre> <p>profiles_controller.rb</p> <pre><code>class ProfilesController &lt; ApplicationController def show @user = User.find(params[:id]) end end </code></pre> <p>profiles_helper.rb:</p> <pre><code>module ProfilesHelper def facebook_profile_info @user.facebook.get_object("#{@user.uid}",fields:'gender, locale, bio, birthday, picture, relationship_status') end end </code></pre> <p>Also, if you have suggestions on better ways to accomplish these tasks than the trajectory I'm headed in, I welcome your suggestions.</p>
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