rails 3:我需要在before_save回调中为对象返回true吗?保存到工作吗?

Class User  
  before_save :set_searchable

  def set_searchable  
    self.searchable = true if self.status == :active  
  end  
end  

>> u = User.last  
>> u.save  
false  
Class User  
  before_save :set_searchable

  d