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我一直在按照本指南使用和安装带有 Devise 和 CanCan 的 Rolify。但是，当我尝试使用在控制台中向用户添加角色时，出现user.add_role :admin以下错误，指出users_roles找不到表。

DEPRECATION WARNING: This dynamic method is deprecated. Please use e.g. Post.find_or_create_by(name: 'foo') instead. (called from irb_binding at (irb):7)
Role Load (0.2ms)  SELECT "roles".* FROM "roles" WHERE "roles"."name" = 'admin' AND "roles"."resource_type" IS NULL AND "roles"."resource_id" IS NULL ORDER BY "roles"."id" ASC LIMIT 1
ActiveRecord::StatementInvalid: Could not find table 'roles_users'

这是我的文件：

用户.rb

class User < ActiveRecord::Base
  rolify
  has_and_belongs_to_many :roles
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :name, :email, :password, :password_confirmation, :remember_me

  validates_presence_of :name
  # attr_accessible :title, :body

end

能力.rb

class Ability
  include CanCan::Ability

  def initialize(user)
    if user.has_role? :admin
      can :manage, :all
    else
      can :read, :all
    end
  end
end

角色.rb

class Role < ActiveRecord::Base
  has_and_belongs_to_many :users, :join_table => :users_roles
  belongs_to :resource, :polymorphic => true

  scopify

结尾

是的，我已经使用rake db:migrate. 我正在使用 rails 4.0.2，那么我该从哪里开始呢？

谢谢！

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