Ruby on rails 4 Rails 4模型始终返回零

下面的错误让我发疯。我有一个用户类和它的两个属性（birth&created_at=>datetime）总是返回nil，而且它在数据库中有一个值

我正在使用Desive来管理身份验证

这是db表：

CREATE TABLE users
(
  id serial NOT NULL,
  email character varying(255) NOT NULL DEFAULT ''::character varying,
  encrypted_password character varying(255) NOT NULL DEFAULT ''::character varying,
  reset_password_token character varying(255),
  reset_password_sent_at timestamp without time zone,
  remember_created_at timestamp without time zone,
  sign_in_count integer NOT NULL DEFAULT 0,
  current_sign_in_at timestamp without time zone,
  last_sign_in_at timestamp without time zone,
  current_sign_in_ip character varying(255),
  last_sign_in_ip character varying(255),
  name character varying(255),
  lastname character varying(255),
  birthday timestamp without time zone,
  gender character varying(255),
  created_at timestamp without time zone,
  updated_at timestamp without time zone,
  authentication_token character varying(255),
  facebook_uid character varying(255),
  gplus_uid character varying(255),
  CONSTRAINT users_pkey PRIMARY KEY (id)
)
WITH (
  OIDS=FALSE
);

这就是模型

#encoding: utf-8
class User < ActiveRecord::Base

  has_many :user_benefits
  has_many :benefits, through: :user_benefits

  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  validates :gender, :inclusion => { :in => %w(m f)}
  validates :email, email_format: { message: "Email invalido" }

  before_save :ensure_authentication_token

  def ensure_authentication_token
    if authentication_token.blank?
      self.authentication_token = generate_authentication_token
    end
  end

  def set_gender new_gender

    case new_gender.downcase
      when "male"
        self.gender = 'm'
      when "female"
        self.gender = 'f'
      when "m"
        self.gender = 'm'
      when "f"
        self.gender = 'f'
      else
        self.gender = nil
    end

  end

  def get_response
    {
        :auth_token=>self.authentication_token,
        :user => {
          :email=> self.email,
          :name=> self.name,
          :lastname=> self.lastname,
          :birthday=> self.birthday,
          :gender=> self.gender,
          :auth_token=> self.authentication_token,
          :created_at=> self.created_at,
          :updated_at=> self.updated_at,
          :facebook_uid=> self.facebook_uid,
          :gplus_uid=> self.gplus_uid
        }
    }
  end

  private

  def generate_authentication_token
    loop do
      token = Devise.friendly_token
      break token unless User.where(authentication_token: token).first
    end
  end

end

有人有主意吗

谢谢，我找到问题了

几天前，我更改了config/application.rb文件，添加了以下配置以解决时区的一些问题：

config.time_zone and config.active_record.default_timezone

---

我刚把它们取下来，一切都恢复正常。

也有同样的问题，特别是

config.active_record.default_timezone

---

这导致activerecord将所有UTC存储的时间戳返回为null。不知道为什么，但删除它会带回所有数据。我可以保留默认的config.time\u区域。

config.active\u记录。默认时区需要一个符号，可以是：local，也可以是：utc

config.time\u zone
需要一个常规时区，就像您所做的那样

config.active\u record.default\u timezone
确定从数据库中提取日期和时间时是使用Time.local（如果设置为：local）还是使用Time.utc（如果设置为：utc）。默认值为：utc


config.active_record.default_timezone