lib/pivot_table/grid.rb in pivot_table-0.4.0 vs lib/pivot_table/grid.rb in pivot_table-0.5.0

@@ -43,14 +43,14 @@
         )
       end
     end
 
     def column_headers
-      headers @column_name
+      @column_headers ||= headers @column_name
     end
 
     def row_headers
-      headers @row_name
+      @row_headers ||= headers @row_name
     end
 
     def column_totals
       columns.map { |c| c.total }
     end