add cacheable to the model

apps/dashboard/lib/smart_attributes/attribute.rb

@@ -34,7 +34,13 @@ def value
     def value=(other)
       @opts[:value] = other
     end
-
+    def cacheable?(default_value) 
+      if opts[:cacheable].nil?
+        default_value
+      else
+        to_bool(opts[:cacheable])
+      end
+    end
     # Type of form widget used for this attribute
     # @return [String] widget type
     def widget
@@ -141,5 +147,11 @@ def unchecked_value
     def reserved_keys
       [:widget, :fixed, :options, :html_options, :checked_value, :unchecked_value, :required, :label, :help, :cacheable]
     end
+
+    FALSE_VALUES=[ false, '', 0, '0', 'f', 'F', 'false', 'FALSE', 'off', 'OFF', 'no', 'NO' ]
+
+    def to_bool(value)
+      ! FALSE_VALUES.include?(value)
+    end
   end
 end