def available_columns
      column_options.reject{|column| viable_report_columns.map(&:column_name).include? column.name.to_s}
    end
def available_columns
      column_options.reject{|column| viable_report_columns.map(&:column_name).include? column.name.to_s}
    end
This is the set of columns not chosed to use in the report. These are the ones available to add
 when updating a report.