lost session after redirect_to - ruby-on-rails

Question

Newly added description: (sorry for not mentioning)
The ApplicationController.current_account is defined as:
class ApplicationController < ActionController::Base
class << self
def current_account
#current_account
end
def current_account=(value)
#current_account = value
end
end
=========
I encountered a strange performance in my current project, which is about session. The strange part is it was normal in Safari but failed in other browsers (includes chrome, firefox and opera).
There is a registration form for input of part of the key information (email, password, etc) and is submitted to an action called "create"
This is the basic code of create action:
#account = Account.new(params[:account])
if #account.save
ApplicationController.current_account = #account
session[:current_account] = ApplicationController.current_account
session[:account] = ApplicationController.current_account.id
email = #account.email
Mailer.deliver_account_confirmation(email)
flash[:type] = "success"
flash[:notice] = "Successfully Created Account"
redirect_to :controller => "accounts", :action => "create_step_2"
else
flash[:type] = "error"
flash[:title] = "Oops, something wasn't right."
flash[:notice] = "Mistakes are marked below in red. Please fix them and resubmit the form. Thanks."
render :action => "new"
end
Also I created a before_filter in the application controller, which has the following code:
ApplicationController.current_account = Account.find_by_id(session[:current_account].id) unless session[:current_account].blank?
For Safari, there is no any problem. But for the other browsers, the session[:current_account] does not exist and so produced the following error message:
RuntimeError in AccountsController#create_step_2
Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id
Please could anyone help me?

Answer 1

1] don't write
ApplicationController.current_account
Just
current_account
2] in your application_controller
def current_account
session[:current_account]
end
3]
ApplicationController.current_account = #account
session[:current_account] = ApplicationController.current_account
session[:account] = ApplicationController.current_account.id
should be
session[:current_account] = #account
session[:account] = #account.id