module Chronicle
  module ETL
    module Utils
      module HashUtilities
        def self.flatten_hash(hash)
          hash.each_with_object({}) do |(k, v), h|
            if v.is_a? Hash
              flatten_hash(v).map do |h_k, h_v|
                h["#{k}.#{h_k}".to_sym] = h_v
              end
            else 
              h[k] = v
            end
           end
        end
      end
    end
  end
end