parser.rb

  def parse(page)
    table = page.at("table.grid")
    rows = table.search("tr").to_a[1..-1]
    rows.each.with_object [] do |row, rows|
      row = parse_row row.search("td").map(&:text)
      rows << row if row
    end
  end

  def parse_row(row)
    if row[4] == "Demonstration"
      nil
    else
      Row.new(*row)
    end
  end