Ruby on rails - rake任务过期客户点余额

Question

我正试图找出如何编写一个rake任务，将每天运行，并找到剩余天数为0的地方更新列量为零。

我在我的模型中定义了以下方法，尽管它们似乎并不完全起作用，因为我在视图

中得到以下错误

undefined method `-@' for Mon, 27 Jun 2016:Date
def remaining_days
    expired? ? 0 : (self.expire_at - Date.today).to_i
  end
  def expired?
    (self.expire_at - Date.today).to_i <= 0
  end
def expire_credits
    if expired?
      self.update(:expire_at => Date.today + 6.months, :amount => 0)
    end
  end

与rake任务，我从来没有写过这些，我认为我将能够调用一个方法的storeredit，将过期点，如果满足某些条件，但我不确定这一切是如何工作的

task :expire_credits => :environment do
  puts 'Expiring unused credits...'
  StoreCredit.expire_credits
  puts "done."
end

Answer 1

# model/store_credit.rb
# get all store_credits that are expired on given date, default to today
scope :expire_on, -> (date = Date.current) { where("expire_at <= ?", date.beginning_of_day) }
class << self
  def expire_credits!(date = Date.current)
    # find all the expired credits on particular date, and update all together 
    self.expire_on(date).update_all(amount: 0)
  end
end

由于这是一个rake任务，我认为将所有过期的任务一起更新会更有效

#rake file
result = StoreCredit.expire_credits!
puts "#{result} records updated"

检索记录计数更新

class << self
  def expire_credits!(date = Date.current)
    # find all the expired credits on particular date, and update all together 
    records = self.expire_on(date)
    records.update_all(amount: 0)
    records.length
  end
end

Answer 2

调用类方法但定义实例方法。您需要定义类方法:

def self.expire_credits