Access session in Helper file ? Rails 3 - ruby-on-rails-3

Question

how to get session in helper file?
UserHelper.rb
module UsersHelper
def self.auth login, password
user = Users.where("firstname = :firstname AND password = :password", {:firstname => login, :password => password})
if user != []
return true
else
return false
end
end
def self.is_auth? level
puts #session
user = Users.where("firstname = :firstname AND password = :password", {:firstname => #session[:firstname], :password => #session[:password]})
if user != []
return true
else
return false
end
end
end
Admin_controller.rb
class AdminController < ApplicationController
include Rails.application.routes.url_helpers
def initialization
#session = session
end
def index
#session = session
if UsersHelper.is_auth?(2)
render :text => "ssssss"
end
end
def auth
if params[:send] != nil
if UsersHelper.auth params[:firstname], params[:password]
session[:firstname] = params[:firstname]
session[:password] = params[:password]
redirect_to :action => "index"
else
#error = 1
end
end
end
def exit
session.delete(:firstname)
session.delete(:password)
render :json => session
end
end
Error
undefined method `[]' for nil:NilClass
app/helpers/users_helper.rb:13:in `is_auth?'
app/controllers/admin_controller.rb:8:in `index'

Answer 1

Only Controller can access session.
So, in a nutshell, if you are going to use this method in Controllers only like what is you case, you can define it as ApplicationController's method. Or define it a module and include it in AppplicationController.
class ApplicationController < ActionController::Base
def auth
end
def is_auth?
end
end
If you want to use the method in both controller and view, just declare them as helper_method
class ApplicationController < ActionController::Base
helper_method :auth, :is_auth?
def auth
end
def is_auth?
end
end
Ref: http://apidock.com/rails/ActionController/Helpers/ClassMethods/helper_method
Another note: In my opinion it's really not worth the time to build auth system from scratch by yourself. The functionalities are not easy but quite general. There are well baked gems such as Devise, Authlogic. Better to use them.