Devise/Cancan Signout User On Controller Action

I have implemented Devise for Authentication and Authorization in ROR application everything seems fine but getting one issue. I have two modals "Account" and "Transactiona" , and so two controllers respectively.

My Transaction Index view call one of Account Controller method like this

$.post("accounts/our_miles_balance/?account_number="+$("#account_number").val(),function(data) {    $("#our_miles_balance").val(data); });

When this ajax post run it gives following error and sign out admin user

You need to sign in or sign up before continuing

Here is my Ability Class

class Ability include CanCan::Ability

def initialize(user)   user ||= User.new # guest user   if user.role == 1 #admin     can :manage, :all     can :read, :all   elsif user.role == 2 #Vendor     can :manage, VendorTransaction     can :index, Account   end end end

Ok Here is my Transaction controller

require 'csv' class TransactionsController < ApplicationController load_and_authorize_resource helper_method :sort_column, :sort_direction

respond_to :html, :js def index   per_page = 40   @transactions = Transaction.search(params[:id]).order(sort_column + " " + sort_direction)

respond_to do |format|   format.html # index.html.erb   format.csv { render :csv => @transactions} end

AND Account Controller

class AccountsController < ApplicationController load_and_authorize_resource helper_method :sort_column, :sort_direction def index    @accounts = Account.search(params[:program_id]   respond_to do |format|     format.html # index.html.erb     format.json { render :json => @accounts} end

def our_miles_balance    a = Account.find_by_account_number(params[:account_number])    @miles = Account.our_miles_balance(a.id) if ?a!=nil     respond_to do |format|      format.json { render json: @miles}   end end end

What i m doing wrong here, please help....