query the chainable instances for display?, delegates to class

git-svn-id: https://dev.finn.de/svn/cockpit/branches/reporting_merge@1775 7926756e-e54e-46e6-9721-ed318f58905e

app/models/cost_query/chainable.rb

@@ -251,6 +251,10 @@ class CostQuery < ActiveRecord::Base
       @table_name || last_table
     end
 
+    def display?
+      self.class.display?
+    end
+
     def table_name
       self.class.table_name
     end

app/views/cost_reports/_restore_query.rhtml

@@ -3,7 +3,7 @@
 
 set_filters = function() {
   // Activate recent filters on loading
-  <% query.filters.select {|f| f.class.display? }.each do |f| %>
+  <% query.filters.select {|f| f.display? }.each do |f| %>
     restore_filter("<%= f.class.underscore_name %>",
                    "<%= f.operator.to_s %>"<%= "," if f.values %>
                     <%= f.values.to_json if f.values  %>);