don't redirect to homepage after signin

app/controllers/application_controller.rb

@@ -3,6 +3,20 @@ class ApplicationController < ActionController::Base
 
   include ApplicationHelper
 
+  after_filter :store_location
+
+  def store_location
+    # store last url - this is needed for post-login redirect to whatever the user last visited.
+    if (request.fullpath != new_member_session_path && \
+      !request.xhr?) # don't store ajax calls
+      session[:previous_url] = request.fullpath
+    end
+  end
+
+  def after_sign_in_path_for(resource)
+    session[:previous_url] || root_path
+  end
+
   # tweak CanCan defaults because we don't have a "current_user" method
   # this means that we use current_user in specs but current_member everywhere
   # else in the code.