Make copy of resource only for update action

app/controllers/devise/registrations_controller.rb

@@ -35,7 +35,11 @@ class Devise::RegistrationsController < ApplicationController
   end
 
   # PUT /resource
+  # We need to use a copy of the resource because we don't want to change
+  # the current user in place.
   def update
+    self.resource = resource_class.to_adapter.get!(send(:"current_#{resource_name}").to_key)
+
     if resource.update_with_password(params[resource_name])
       set_flash_message :notice, :updated if is_navigational_format?
       sign_in resource_name, resource, :bypass => true
@@ -102,11 +106,9 @@ class Devise::RegistrationsController < ApplicationController
       end
     end
 
-    # Authenticates the current scope and gets a copy of the current resource.
-    # We need to use a copy because we don't want actions like update changing
-    # the current user in place.
+    # Authenticates the current scope and gets the current resource from the session.
     def authenticate_scope!
       send(:"authenticate_#{resource_name}!", true)
-      self.resource = resource_class.to_adapter.get!(send(:"current_#{resource_name}").to_key)
+      self.resource = send(:"current_#{resource_name}")
     end
 end