Ruby/Rails using || to determine value, using an empty string instead of a nil value

Question

I usually do

 value = input || \"default\"

so if input = nil

 value = \"default\"

But how can I do this so in

Answer 1

Rails adds presence method to all object that does exactly what you want

input = ''
value = input.presence || "default"
=> "default"

input = 'value'
value = input.presence || "default"
=> "value"

input = nil
value = input.presence || "default"
=> "default"