Why does this RABL node return nil?

Question

node :transitType do |u|
    :Entry if u.type == 'HorseEntryTransit'
    :Exit  if u.type == 'HorseExitTransit'
end

I tried the following and this code snippet returns true.

node :transitType do |u|
    u.type == 'HorseEntryTransit'
end

Answer 1

You can improve the code block and avoid testing two conditions ( when the first one is met). Also, presume a case where neither condition is met. It looks like you would get nil when the second condition fails even though the first condition was true.

 node :transitType do |u|
     if u.type == 'HorseEntryTransit'
          :Entry 
     elsif u.type == 'HorseExitTransit'
          :Exit
     else
          nil #or :Neither
     end
end

Your code does not work when the first condition is actually met since the second condition will still be tested and the result of that condition is nil.