The clean way is using presence
.
Let's test it.
' '.presence
# => nil
''.presence
# => nil
'text'.presence
# => "text"
nil.presence
# => nil
[].presence
# => nil
{}.presence
# => nil
true.presence
# => true
false.presence
# => nil
Please note this method is from Ruby on Rails v4.2.7 https://apidock.com/rails/Object/presence