Facebook Koala Gem - Logging Out - ruby-on-rails

Question

I'm having issues logging out using the Koala Gem, and wondering whether they're related.
Below is my Javascript code:
<script>
window.fbAsyncInit = function() {
FB.init({
appId : '310521258992725', // App ID
channelUrl : '//localhost:3000/channel', // Channel File
status : true, // check login status
cookie : true, // enable cookies to allow the server to access the session
xfbml : true // parse XFBML
});
// Additional initialization code here
// whenever the user logs in, we refresh the page
FB.Event.subscribe('auth.login', function() {
setTimeout('document.location.reload()',0);
});
FB.logout(function(response) {
FB.Auth.setAuthResponse(null, 'unknown');
setTimeout('document.location.reload()',0);
});
};
// Load the SDK Asynchronously
(function(d){
var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
if (d.getElementById(id)) {return;}
js = d.createElement('script'); js.id = id; js.async = true;
js.src = "//connect.facebook.net/en_US/all.js";
ref.parentNode.insertBefore(js, ref);
}(document));
</script>
Below is my Facebook tag:
<div id="fb-root"></div>
My logout code:
Logout
The login works perfectly and I can execute api calls no problem. However, after I logout, I get the following error:
OAuthException: Error validating access token: The session is invalid because the user logged out. app/controllers/application_controller.rb:58: in 'fbookinvite_check'
Below is my fbookinvite_check code:
def fbookinvite_check
unless #facebook_cookies.nil?
#access_token = #facebook_cookies["access_token"]
#graph = Koala::Facebook::GraphAPI.new(#access_token)
if !#graph.nil? == true
#friends = #graph.get_object("/me/friends")
end
end
end
The problem seems to be that the cookie is that the access token is invalidated, #graph is not showing as nil after the redirect. If I refresh, then the page loads no problem, but I get the error when I log out.
Perhaps there's a way to catch the #graph.get_object error without shutting down the application?
Any suggestions would be greatly appreciated!!

Answer 1

Yes, just wrap your fbookinvite_check in a begin/rescue where you rescue from OAuthException and then return something sane for your application.
You answered your own question:
Perhaps there's a way to catch the #graph.get_object error without
shutting down the application?
Wrap your logic in a begin/rescue block like so:
def fbookinvite_check
begin
unless #facebook_cookies.nil?
#access_token = #facebook_cookies["access_token"]
#graph = Koala::Facebook::GraphAPI.new(#access_token)
if !#graph.nil? == true
#friends = #graph.get_object("/me/friends")
end
end
rescue OAuthException => ex
# handle the exception if you need to, or just ignore it if thats ok too
end
end