Ruby script to check if Boros Sammlung in Berlin has any free space on provided dates

boros_sammlung_availability_checker.rb

url = "https://www.sammlung-boros.de/visit/fuehrungen-buchen.html?L=1#item_2"
date_range = Date.parse("10-05-2019")..Date.parse("13-05-2019")
html = open(url)
doc = Nokogiri::HTML(html)
doc.search(".block_empty").map do |b| 
  [b.parent.parent.parent.search("h1").text.split(",")[1].strip, b.parent.text.chomp.strip] 
end.select { |r| Date.parse(r[0]).in?(date_range) }