Setting a value to nil? - ruby-on-rails

Question

I've run into a problem in Ruby that I can't seem to find an answer online for.
I have a few forms, and on one of them, I'm trying to set the value of age to nil if nothing is entered.
This is the relevant section for what I have right now:
puts "What is #{name}'s estimated age?"
age = gets.to_i
def set_nils
age = nil if age.blank?
end
I've tried a few different ideas, but nothing seems to change my final output (just printing age back) at all.

Answer 1

The problem is that if you enter nothing as your input and convert this \n to an integer, the value becomes 0 because:
irb(main):008:0> '\n'.to_i
=> 0
Therefore, you should change to this:
puts "What is #{name}'s estimated age?"
input = gets.to_i
#age = input > 0 ? input : nil
def set_nils
#age ||= nil
end
Output with valid age (> 0):
irb(main):001:0> name = "Tim"
=> "Tim"
irb(main):002:0> puts "What is #{name}'s estimated age?"
What is Tim's estimated age?
=> nil
irb(main):003:0> input = gets.to_i
8
=> 8
irb(main):004:0> #age = input > 0 ? input : nil
=> 8
irb(main):005:0>
irb(main):006:0* def set_nils
irb(main):007:1> #age ||= nil
irb(main):008:1> end
=> nil
irb(main):009:0> set_nils
=> 8
Output with invalid age (< 0):
irb(main):017:0> name = "Tim"
=> "Tim"
irb(main):018:0> puts "What is #{name}'s estimated age?"
What is Tim's estimated age?
=> nil
irb(main):019:0> input = gets.to_i
-1
=> -1
irb(main):020:0> #age = input > 0 ? input : nil
=> nil
irb(main):021:0>
irb(main):022:0* def set_nils
irb(main):023:1> #age ||= nil
irb(main):024:1> end
=> nil
irb(main):025:0> set_nils
=> nil