Changed inherit_smart_variables to inherit_smart_settings

lib/blazer/data_source.rb

@@ -44,13 +44,21 @@ module Blazer
     end
 
     def smart_columns
-      settings["smart_columns"] || {}
+      @smart_columns ||= begin
+        sc = settings["smart_columns"] || {}
+        Array(settings["inherit_smart_settings"]).each do |ds|
+          (Blazer.data_sources[ds].settings["smart_columns"] || {}).each do |k, v|
+            sc[k] ||= v
+          end
+        end
+        sc
+      end
     end
 
     def smart_variables
       @smart_variables ||= begin
         sv = settings["smart_variables"] || {}
-        Array(settings["inherit_smart_variables"]).each do |ds|
+        Array(settings["inherit_smart_settings"]).each do |ds|
           (Blazer.data_sources[ds].settings["smart_variables"] || {}).each do |k, v|
             sv[k] ||= v
           end