cell_set is a ruby implementation of the CellSet and related models from mondrian.olap4j. The cell_set gem automatically mixes in a to_ruby method on Mondrian::OLAP::CellSet that can be called from the instance variable @raw_cell_set in an instance of Mondrian::OLAP::Result. Normally the to_ruby method is automatically called in the to_cell_set method in an instance of Mondrian::OLAP::Result.