def get_units_from_gs(gs)
  return {} if gs.nil?
  # powers[power_name]['units'] に入っていると想定
  units = {}
  if gs['powers'].is_a?(Hash)
    gs['powers'].each do |power, data|
      units[power] = data['units']
    end
  end
  units
end

t1 = Turn.find_by(number: 1)
t2 = Turn.find_by(number: 2)

puts "--- Turn 1 (SPRING 1901 MOVEMENT) Units ---"
u1 = get_units_from_gs(t1&.game_state)
puts u1.inspect

puts "\n--- Turn 2 (FALL 1901 MOVEMENT) Units ---"
if t2
  u2 = get_units_from_gs(t2.game_state)
  puts u2.inspect
  
  puts "\nDifference detected?"
  if u1 == u2
    puts "NO CHANGE in unit positions!"
  else
    puts "Unit positions HAVE CHANGED."
  end
  
  puts "\nTurn 1 Orders stored in DB:"
  puts t1.orders.inspect
else
  puts "Turn 2 not found."
end