一切都设置得很好，似乎正在工作。突然我有一个问题，如果我注销，然后用不同的用户名再次登录，它只是登录我总是作为第一个用户。
示例：
用户1-first@domain.comwww.example.com/password1
用户2-second@domain.comwww.example.com/password2
即使我注销，然后以用户2的身份再次登录（验证为正确注册），它也会以用户1的身份登录我。

这是我的用户.rb文件

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

    acts_as_voter
    has_many :links
    has_many :comments

    # Virtual attribute for authenticating by either username or email
    # This is in addition to a real persisted field like 'username'
    attr_accessor :login

    def self.find_for_database_authentication(warden_conditions)
      conditions = warden_conditions.dup
      if login = conditions.delete(:login)
        where(conditions.to_h).where(["lower(username) = :value OR lower(email) = :value", { :value => login.downcase }]).first
      elsif conditions.has_key?(:username) || conditions.has_key?(:email)
        where(conditions.to_h).first
      end
      conditions[:email].downcase! if conditions[:email]
      where(conditions.to_h).first
    end

    validates :username, presence: :true, uniqueness: { case_sensitive: false }
    validates_format_of :username, with: /^[a-zA-Z0-9_\.]*$/, :multiline => true

    validate :validate_username
    def validate_username
      if User.where(email: username).exists?
        errors.add(:username, :invalid)
      end
    end
end

应用程序控制器

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception

  before_action :configure_permitted_parameters, if: :devise_controller?
  protected
  def configure_permitted_parameters
    added_attrs = [:username, :email, :password, :password_confirmation, :remember_me]
    devise_parameter_sanitizer.permit :sign_up, keys: added_attrs
    devise_parameter_sanitizer.permit :account_update, keys: added_attrs
  end
end