Ruby Sinatra storing variables - ruby

Question

In the code below, the initial get '/' contains a form, whose action is post '/'. when the user inputs a number, it should be converted to a variable that will be used to call the Game class, for which I have generated another action to reveal a new form at get '/game'. the variable generated in the post method is not being stored. how can I both store the variable created in post and then link into the get '/game' action?
require 'sinatra'
require 'sinatra/reloader'
##count = 5
Dict = File.open("enable.txt")
class Game
attr_accessor :letters, :number, :guess, :disp
##count = 5
def initialize (number)
letters = find(number)
end
def find (n)
words =[]
dictionary = File.read(Dict)
dictionary.scan(/\w+/).each {|word| words << word if word.length == n}
letters = words.sample.split("").to_a
letters
end
def counter
if letters.include?guess
correct = check_guess(guess, letters)
else
##count -= 1
end
end
end
get '/' do
erb :index
end
post '/' do
n = params['number'].to_i
#letters = Game.new(n)
redirect '/game'
end
get "/game" do
guess = params['guess']
letters = #letters
if guess != nil
correct = check_guess(guess, letters)
end
disp = display(letters, correct)
erb :game, :locals => {:letters => letters, :disp => disp}
end
def display(letters, correct)
line = "__"
d=[]
letters.each do |x|
if correct == nil
d << line
elsif correct.include?x
d << x
else
d << line
end
end
d.join(" ")
end
def check_guess(guess, letters)
correct = []
if guess != nil
if letters.include?guess
correct << guess
end
end
correct
end

Answer 1

You cannot do this:
#letters = Game.new(n)
each time you create a request, and new Request instance created and so the #letters attribute no longer exists.
It's the equivalent of
r = Request.new()
r.letters = Game.new()
r = Request.new()
r.letters # not defined anymore!!
You could achieve what you want using a class variable instead
##letters = Game.new(n)
Although this will become a nightmare when you have multiple users and will only work when you have a single ruby server process.
A more advanced approach would be to store params['number'] in a session cookie or in a database.