CanCan error 'undefined method role?' with Devise

Hey I hope you can help me:

I was going through this tutorial

http://www.to开发者_如何学JAVAnyamoyal.com/2010/07/28/rails-authentication-with-devise-and-cancan-customizing-devise-controllers/ and I did every step by step.

I wasnt quite sure where to put the role?-method from the tutorial, because it doesnt say where to place it.

Now it gives me this error when I want to sign_up or Sign_in

Many thanks

You need to add it in the user model (app/models/user.rb)

class User < ActiveRecord::Base
  has_and_belongs_to_many :roles
  devise :database_authenticatable, :confirmable, :recoverable, :rememberable, :trackable, :validatable

  def role?(role)
      return !!self.roles.find_by_name(role.to_s.camelize)
  end
end

You should refer to this:

https://github.com/ryanb/cancan/wiki/Role-Based-Authorization

I think it'll be really helpful..