small improvement

Author: scambra

lib/active_scaffold/helpers/view_helpers.rb

@@ -235,9 +235,8 @@ def action_link_url(link, record)
           url_options = action_link_url_options(link, record)
           if active_scaffold_config.cache_action_link_urls
             url = url_for(url_options)
-            model = active_scaffold_config.model
-            is_sti_record = record && model.columns_hash.include?(model.inheritance_column) &&
-              record[model.inheritance_column].present?
+            inheritance_column = active_scaffold_config.model.inheritance_column
+            is_sti_record = record && model.columns_hash.include?(inheritance_column) && record[inheritance_column].present?
             unless link.dynamic_parameters.is_a?(Proc) || is_sti_record
               @action_links_urls[link.name_to_cache_link_url] = url 
             end