为什么acts_as_paranoid破坏了我的模型

Question

我最近将"偏执狂"宝石添加到我的项目的User model中。该模型还使用了CCD_ 2；直到我把CCD_ 3放在我的CCD_。现在我得到的是以下参数错误：

Started GET "/users/8/edit" for 127.0.0.1 at 2014-09-16 20:57:48 -0400
Processing by UsersController#edit as HTML
  Parameters: {"id"=>"8"}
Completed 500 Internal Server Error in 5ms
ArgumentError (wrong number of arguments (0 for 1)):
  app/models/user.rb:19:in `hash'
  app/helpers/sessions_helper.rb:25:in `current_user'
  app/helpers/sessions_helper.rb:11:in `signed_in?'
  app/helpers/sessions_helper.rb:33:in `signed_in_user'

任何想法都将不胜感激。

这是我的用户模型：

class User < ActiveRecord::Base
  acts_as_paranoid
  before_save { self.email = email.downcase }
    before_create :create_remember_token
    validates :name, presence: true, length: { maximum: 50 }
    VALID_EMAIL_REGEX = /A[w+-.]+@[a-zd-.]+.[a-z]+z/i
    validates :email, presence: true, format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
    validates :password, length: { minimum: 6 }
    validates_inclusion_of :status, :in => ['active', 'inactive']
    has_secure_password

    def User.new_remember_token
        SecureRandom.urlsafe_base64
    end
    def User.hash(token)
        Digest::SHA1.hexdigest(token.to_s)
    end
private
    def create_remember_token
      self.remember_token = User.hash(User.new_remember_token)
    end
end

这是我的会话助手：

module SessionsHelper
  def sign_in(user)
    remember_token = User.new_remember_token
    cookies.permanent[:remember_token] = remember_token
    user.update_attribute(:remember_token, User.hash(remember_token))
    self.current_user = user
  end
  def signed_in?
    !current_user.nil?
  end

  def current_user=(user)
    @current_user = user
  end
  def current_user
    @current_user     
  end
   def current_user
    remember_token = User.hash(cookies[:remember_token])
    @current_user ||= User.find_by(remember_token: remember_token)
  end
  def current_user?(user)
    user == current_user
  end
  def signed_in_user
    unless signed_in?
      store_location
      redirect_to signin_url, notice: "Please sign in."
    end
  end
   def sign_out
    self.current_user = nil
    cookies.delete(:remember_token)
  end
  def redirect_back_or(default)
    redirect_to(session[:return_to] || default)
    session.delete(:return_to)
  end
  def store_location
    session[:return_to] = request.url if request.get?
  end
end

Answer 1

User.hash按照其父类的约定不接受参数，应返回Fixnum。

它用于Ruby语言中其他类的对象比较，例如在Hash中查找键的值时。如果a.eql?(b)，那么a.hash == b.hash也必须为真。

解决这个问题的最好方法是将hash方法重命名为其他方法，而不是妨碍Ruby约定。