Accessing variables from different controllers - ruby-on-rails

Question

I'm trying to build a game where you guess numbers.
The problem is if you make a mistake it redirects you to a leaderboard(mvc) form where you enter your name plus it`s pre populated with sessions data from a different controller(game) and submits both into the DB.
#round & #points are the two variables I want to access and store as score and level.
class ApplicationController < ActionController::Base
before_filter :set_current_account
def set_current_account
# set #current_account from session data here
Game.current = #round
end
protect_from_forgery
end
-
class Leaderboard < ActiveRecord::Base
cattr_accessor :current
end
# == Schema Information
#
# Table name: leaderboards
#
# id :integer not null, primary key
# name :string(255)
# score :string(255)
# level :string(255)
# created_at :datetime
# updated_at :datetime
#
-
class GameController < ApplicationController
def index
#games = Game.all
respond_to do |format|
format.html
end
end
def start_game
session[:round] ||= 1
session[:points] ||= 0
#round = session[:round]
#points = session[:points]
end
def generate_round
numbers = Array.new(6){rand(9)}
#addition = []
#display = numbers
numbers.inject do |s, i|
#addition << s + i
#addition.last
end
end
def next_round
session[:round] += 1
session[:points] += 1200
#round = session[:round]
#points = session[:points]
end
def destroy_sessions
session[:round] = nil
session[:points] = nil
session[:addition] = nil
#round = session[:round]
#points = session[:points]
#addition = session[:addition]
start_game
end
def submit_name
#game = Game.new(params[:game])
respond_to do |format|
if #game.save
format.html { redirect_to(leaderboard_path, :notice => 'Score was added successfully.') }
else
format.html { render :action => "new" }
end
end
end
def game_over
redirect_to :controller => 'leaderboards', :action => 'new' and return
end

Answer 1

I haven't read the whole thing, but if you just want to access those variables, you can just pass them as parameters.
Pass those values into game_over as params
Use this to redirect
redirect_to :controller => 'leaderboards', :action => 'new' and return, :round => params[:round], :points => params[:points]
Alternatively, you can just keep the session until a new game is started or score is recorded to the leaderboard.

Answer 2

I think you've taken an approach here that shouldn't even work. The Rails MVC framework is structured around the principle that each request is serviced independently, and that, in theory, there is no state transfer from one request to the next except through params passed in, records stored in the database and the persistent user session.
To design a web-based application like you might a single-process, single-user, single-session program is a mistake. Using singletons, like your cattr_accessor called current will be problematic since it is both shared between requests, and not shared between different instances of Rails, of which there are typically many.
Mapping more closely to the REST standard of index, new, create, show, edit, update and destroy would help. For instance start_game should be create and destroy_sessions should probably be destroy.
It's not clear from your design if each game is shared amongst several users, or if it they are created for each user individually, so it's hard to say more about how to solve your problem.