Range cover example

gistfile1.rb

require 'nokogiri'
xml = %{
<Employments>
  <Employment>
    <From>2013-01-01</From>
    <To>1900-01-01</To>
    <MainEmployment>0</MainEmployment>
  </Employment>
  <Employment>
    <From>2014-11-01</From>
    <To>2014-11-30</To>
    <MainEmployment>1</MainEmployment>
  </Employment>
</Employments>}

doc = Nokogiri::XML(xml)

employments = []
today = Date.today
ongoing = Date.new(1900, 01, 01)

doc.search('//Employment').each do |emp|
  from = Date.strptime(emp.at('From').text, '%Y-%m-%d')
  to = Date.strptime(emp.at('To').text, '%Y-%m-%d')
  main = emp.at('MainEmployment').text

  if to == ongoing
      to = today + 1 
  end
  
  if (from..to).cover?(today)
    employments << {main: main, from: from, to: to}
  end
end

current_employment = employments.empty? ? nil : employments.sort_by{|emp| emp[:main]}.reverse.first