未定义的方法attr_accessible

Question

我对rails很新,我正在尝试创建用户登录.我浏览了这里的教程.最后它让我为质量分配添加"attr_accessible".但是,当我这样做时,我收到以下错误:

undefined method `attr_accessible' for #<Class:0x007ff70f276010>

我在这篇文章中看到我需要<ActiveRecord :: Base.但我确实包含了这一点.这是我的用户模型的代码:

class User < ActiveRecord::Base

  attr_accessor :password
  EMAIL_REGEX = /\A[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\z/i
  validates :username, :presence => true, :uniqueness => true, :length => { :in => 3..20 }
  validates :email, :presence => true, :uniqueness => true, :format => EMAIL_REGEX
  validates :password, :confirmation => true #password_confirmation attr
  validates_length_of :password, :in => 6..20, :on => :create
  before_save :encrypt_password
  after_save :clear_password
  attr_accessible :username, :email, :password, :password_confirmation

  def encrypt_password
    if password.present?
      self.salt = BCrypt::Engine.generate_salt
      self.encrypted_password= BCrypt::Engine.hash_secret(password, salt)
    end
  end

  def clear_password
    self.password = nil
  end

end

关于可能导致这个问题的任何其他想法将非常感谢,谢谢!

编辑:On Rails 4.1.看起来它不再适用了.谢谢fotanus

Answer 1

Rails 4.1不允许批量分配

而不是attr_accessible :username, :email, :password, :password_confirmation在您的模型中,使用强参数.您将在UsersController中执行此操作:

    def user_params
      params.require(:user).permit(:username, :email, :password, :password_confirmation)
    end

然后在控制器操作中调用user_params方法.

Answer 2

Rails 4.1不允许批量分配

你将不得不尝试这样的事情.

class Person
  has_many :pets
  accepts_nested_attributes_for :pets
end

class PeopleController < ActionController::Base
  def create
    Person.create(person_params)
  end

  ...

  private

    def person_params
      # It's mandatory to specify the nested attributes that should be whitelisted.
      # If you use `permit` with just the key that points to the nested attributes hash,
      # it will return an empty hash.
      params.require(:person).permit(:name, :age, pets_attributes: [ :name, :category ])
    end
end

参考

https://github.com/rails/strong_parameters

Answer 3

确保您已安装 gem 'protected_attributes'，该 gem 存在于您的 gemfile 中并运行bundle install终端。然后重启你的服务器。