lib/gooddata/models/model.rb in gooddata-0.6.3 vs lib/gooddata/models/model.rb in gooddata-0.6.4

@@ -89,10 +89,10 @@
       end
 
       def merge_dataset_columns(a_schema_blueprint, b_schema_blueprint)
         a_schema_blueprint = a_schema_blueprint.to_hash
         b_schema_blueprint = b_schema_blueprint.to_hash
-        d = Marshal.load(Marshal.dump(a_schema_blueprint))
+        d = a_schema_blueprint.deep_dup
         d[:columns] = d[:columns] + b_schema_blueprint[:columns]
         d[:columns].uniq!
         columns_that_failed_to_merge = d[:columns].group_by { |x| x[:name] }.map { |k, v| [k, v.count] }.select { |x| x[1] > 1 }
         fail "Columns #{columns_that_failed_to_merge} failed to merge. When merging columns with the same name they have to be identical." unless columns_that_failed_to_merge.empty?
         d