ruby-on-rails - Created_at.1.year.from_now - Rails

Question

我需要制作一种方法，将日期呈现到创建日期后一年的表中。我试过标题中列出的那一行，但那没有用。我现在有一张表，旁边列出了“加入日期”，我希望它说“日期过期”。从加入之日起一年。

例子:

class Subscriber < ActiveRecord::Base
  validates :first_name, presence: true
  validates :last_name, presence: true
  validates :email, presence: true
  validates :phone_number, presence: true

  def date_joined
   created_at.strftime("%-m/%-d/%-y")
  end

  def expiration_date
   created_at.1.year.from_now
  end
end

我应该如何格式化该 expiration_date 方法。 date_joined 工作正常。

Answer 1

您应该将 1.year 添加到 created_at 时间对象:

def expiration_date
  created_at + 1.year
end

格式化:

def expiration_date
  (created_at + 1.year).strftime("%-m/%-d/%-y")
end

rails 控制台:

=> some_object.created_at
=> Wed, 12 Apr 2016 17:37:12 UTC +00:00
=> some_object.created_at + 1.year
=> Wed, 12 Apr 2017 17:37:12 UTC +00:00
=> (some_object.created_at + 1.year).strftime("%-m/%-d/%-y")
=> "4/12/17"