Question

Is there a Rails/Ruby idiom for checking if an enumerable is both present and has non-nil values?

I get errors if I ever try to do nil.any? so I always have to do if foo && foo.any?.

Answer 1

You can use the try method provided by ActiveSupport:

obj.try(:any?)

This will evaluate to nil if obj.nil? or to false if obj is an empty collection, so in both cases it will evaluate to a falsy value in a boolean context.