class EPaperSubscriber

  include Mongoid::Document
  include Mongoid::Timestamps

  field :email, type: String
  field :subscribed, type: Boolean, :default => true
  field :language
  field :last_paper_sent

  before_save do
    self.fix_email
    # 修改點：用 throw(:abort) 取代 return false（Rails 5+ block 內不可用 return）
    # 修改點：排除自己這筆(self.id.ne=>self.id)，避免更新既有紀錄時把自己算成重複
    if self.class.where(:id.ne=>self.id, :email=>self.email, :language=>self.language, :subscribed=>true).count != 0
      throw(:abort)
    end
  end

  def fix_email(save_flag=false)
    # 修改點：加上 .downcase，統一大小寫，避免 ABC@Gmail.com 跟 abc@gmail.com 被當成兩筆
    self.email = self.email.to_s.gsub(/[  ]/,'').sub(/;$/, '').downcase
    self.save if save_flag
  end
end