设计：要求管理员激活帐户

Question

我正在尝试设置设计，要求管理员在用户登录前批准注册请求。

当我尝试填写注册表单时，我的user.rb文件中出现以下错误。

SyntaxError at /users
syntax error, unexpected tIVAR, expecting keyword_do or '{' or '('

错误的引用在此方法中：

   def send_admin_mail
         AdminMailer.new_user_waiting_for_approval(self).deliver
       end


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

  # do i need a session controller for users? I have user/registration_controller and user/omniauth controller only?


  after_create :send_admin_mail

  mount_uploader :avatar, AvatarUploader



  acts_as_messageable



# --------------- associations


  has_one :account_history
  has_one :shortlist
  has_one :match_maker
  has_many :authentications
  has_many :relationships, foreign_key: "follower_id", dependent: :destroy
  has_many :followed_users, through: :relationships, source: :followed
  has_many :followers, through: :reverse_relationships

# --------------- validations


# --------------- class methods


       def send_admin_mail
         AdminMailer.new_user_waiting_for_approval(self).deliver
       end

       def disapprove 
           self.approved = false 
         end 
         def approve 
           self.approved = true 
         end 

       def active_for_authentication? 
           super && approved? 
         end 

         def inactive_message 
           if !approved? 
             :not_approved 
           else 
             super # Use whatever other message 
           end
         end      

      def self.send_reset_password_instructions(attributes={})
          recoverable = find_or_initialize_with_errors(reset_password_keys, attributes, :not_found)
          if !recoverable.approved?
            recoverable.errors[:base] << I18n.t("devise.failure.not_approved")
          elsif recoverable.persisted?
            recoverable.send_reset_password_instructions
          end
          recoverable
        end 
      end 
  # ----  Greeting

  def sayHello(first_name)
    "Hello, #{first_name.capitalize}"
  end

请任何人都可以帮忙。我无法看到错误的位置。这让我感到沮丧。谢谢。