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如何在Ruby中添加两周到当前的Time.now？我有一个使用DataMapper的小型Sinatra项目,在保存之前,我有一个填充了当前时间PLUS两周的字段,但是根本不能正常工作.任何帮助是极大的赞赏!我收到以下错误:

NoMethodError at /
undefined method `weeks' for 2:Fixnum

以下是模型的代码:

class Job
  include DataMapper::Resource

  property :id,           Serial
  property :position,     String
  property :location,     String
  property :email,        String
  property :phone,        String
  property :description,  Text
  property :expires_on,   Date
  property :status,       Boolean
  property :created_on,   DateTime
  property :updated_at,   DateTime

  before :save do
    t = Time.now
    self.expires_on = t + 2.week
    self.status = '0'
  end
end