get.chomp.to_i always outputs the number 0, regardless of the string input. My code is below with the output following.

def create_list
  print "What is the list name? "
  name = gets.chomp

  hash = { "name" => name, "items" => Array.new }
  return hash
end

def add_list_item
  print "What is the item called? "
  item_name = gets.chomp

  print "How much? "
  quantity = gets.chomp.to_i

  hash = { "name" => item_name, "quantity" => quantity }
  return hash
end

list = create_list()
puts list.inspect
list['items'].push(add_list_item())

puts list.inspect

treehouse:~/workspace$ ruby shopping_list.rb                                                    
What is the list name? Grocery                                                                  
{"name"=>"Grocery", "items"=>[]}                                                                
What is the item called? Milk                                                                   
How much? two                                                                                   
{"name"=>"Grocery", "items"=>[{"name"=>"Milk", "quantity"=>0}]}