Redirect back to current page after sign in.

app/controllers/application_controller.rb

 require 'gon'
 
 class ApplicationController < ActionController::Base
+  before_filter :store_location
   before_filter :authenticate_user!
   before_filter :reject_blocked!
   before_filter :check_password_expiration
@@ -48,7 +49,18 @@ class ApplicationController < ActionController::Base
       flash[:alert] = "Your account is blocked. Retry when an admin has unblocked it."
       new_user_session_path
     else
-      super
+      session[:previous_url] || root_path
+    end
+  end
+
+  def store_location
+  # store last url - this is needed for post-login redirect to whatever the user last visited.
+    if (request.fullpath != "/users/sign_in" &&
+        request.fullpath != "/users/sign_up" &&
+        request.fullpath != "/users/password" &&
+        request.fullpath != "/users/sign_out" &&
+        !request.xhr?) # don't store ajax calls
+      session[:previous_url] = request.fullpath
     end
   end