Add custom fields to payload AFTER action is called

related issues
- Add custom fields to payload AFTER action is called [shadabahmed#24](shadabahmed#24)
- Custom fields to payload after action is called no longer working? [shadabahmed#102](shadabahmed#102)

lib/logstasher/rails_ext/action_controller/metal/instrumentation.rb

@@ -23,6 +23,8 @@ def process_action(*args)
           logstasher_add_custom_fields_to_request_context(LogStasher.request_context)
         end
 
+        result = super
+
         if self.respond_to?(:logtasher_add_custom_fields_to_payload)
           before_keys = raw_payload.keys.clone
           logtasher_add_custom_fields_to_payload(raw_payload)
@@ -31,8 +33,6 @@ def process_action(*args)
           LogStasher::CustomFields.add(*(after_keys - before_keys))
         end
 
-        result = super
-
         payload[:status] = response.status
         append_info_to_payload(payload)
         LogStasher.store.each do |key, value|