Made a few more changes to get omniauth/openid working. It seems to work

now for connecting to a local account that already exists.

app/controllers/authentications_controller.rb

@@ -15,7 +15,7 @@ def create
       user.apply_omniauth(omniauth)
       user.save
       flash[:info] = 'Authentication successful.'
-      redirect_to home_url
+      redirect_to root_url
     else
       # User is new to this application
       user = User.new
@@ -41,9 +41,9 @@ def destroy
   private
   def sign_in_and_redirect(user)
     unless current_user
-      user_session = UserSession.new(User.find_by_single_access_token(user.single_access_token))
+      user_session = UserSession.new(user)
       user_session.save
     end
-    redirect_to home_path
+    redirect_to root_url
   end
 end