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    copied!<p>I ran into the same problem when trying to use facebook_oauth (https://github.com/moomerman/facebook_oauth) on my rails app. After spending an hour or so trying to change its code, i realized it might be easier just to use oauth2 directly. I solved the problem and now there's no need for that intermediate library. Here's how:</p> <p>In <code>Gemfile</code> add</p> <pre><code>gem 'oauth2' </code></pre> <p>Then run</p> <p><code>bundle update</code></p> <p>Then, in your <code>login_via_facebook</code> method you either construct the dialog uri manually or use the oauth client something along these lines:</p> <pre><code>oauth_client = OAuth2::Client.new(APPLICATION_ID, APPLICATION_SECRET, { :authorize_url =&gt; 'https://www.facebook.com/dialog/oauth' }) redirect_to oauth_client.authorize_url({ :client_id =&gt; APPLICATION_ID, :redirect_uri =&gt; YOUR_REDIRECT_URL }) </code></pre> <p>If you need to request additional permissions, specify <code>scope</code> param in the <code>authorize_url</code> call:</p> <pre><code>redirect_to oauth_client.authorize_url({ :client_id =&gt; APPLICATION_ID, :redirect_uri =&gt; YOUR_REDIRECT_URL, :scope =&gt; 'offline_access,email' }) </code></pre> <p>Then, in the method that handles YOUR_REDIRECT_URL (i call mine <code>login_via_facebook_callback</code>), do something like this:</p> <pre><code>oauth_client = OAuth2::Client.new(APPLICATION_ID, APPLICATION_SECRET, { :site =&gt; 'https://graph.facebook.com', :token_url =&gt; '/oauth/access_token' }) begin access_token = oauth_client.get_token({ :client_id =&gt; APPLICATION_ID, :client_secret =&gt; APPLICATION_SECRET, :redirect_uri =&gt; YOUR_REDIRECT_URL, :code =&gt; params[:code], :parse =&gt; :query }) access_token.options[:mode] = :query access_token.options[:param_name] = :access_token facebook_user_info = access_token.get('/me', {:parse =&gt; :json}).parsed rescue Error =&gt; e # You will need this error during development to make progress :) #logger.error(e) end </code></pre> <p>Now <code>facebook_user_info</code> has the basic user info!</p>
 

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