如何检查Httparty和Ruby中不存在的fieldw？

Question

Being the xml result of a HttParty request

<people>
                <person>
                    <height>192</height>
                    <weight>80</weight>
                </person>
                <person>
                    <height>180</height>
                </person>
</people>

Some have entered their weight and height, some others only their height

So wen I do

entries.each do |item|

puts item["person"]["height"]
puts item["person"]["weight"]
end

It breaks when it finds the first person with no registered weight. I have tried using .nil? with no luck. How can I recognize non existent fields?

Answer 1

I imagine item is an hash. So there are things you can do

person = item["person"]
if person.key?("weight")
  puts person["weight"] 
else
  puts "no weight"
end

or

person = item["person"]
puts person.fetch("weight", "no weight")

I suggest you to study Ruby hashes