Question

我的应用程序涉及人们进入主页，输入他们所做的赌注的名称（为了好玩），他们的电子邮件地址，他们想要提醒的日期以及有关赌注的一些细节。我正在使用每当宝石来运行一次。

bet.rb

class Bet < ActiveRecord::Base
  attr_accessible :details, :email, :name, :reminder, :sent

  # Sends user a reminder if current_date is equal to the reminder date of the bet
  def check_bet
    current_date = Time.now.strftime("%Y-%m-%d").to_s
    @bets = Bet.all
    @bets.each do |bet|
    BetMailer.bet_reminder(bet).deliver and bet.sent = true and bet.save! if bet.reminder.to_s == current_date
    end 
  end
end

schedule.rb

every :day, :at => '5:00pm' do
  runner "Bet.check_bet"
end

bet_mailer.rb

class BetMailer < ActionMailer::Base
  default from: "from@example.com"

  def bet_reminder(bet)
    @bet = bet

    mail to: bet.email, subject: bet.name + " Reminder"
  end
end

当current_date等于他们想要提醒的日期（提醒）时，我已成功发送电子邮件。为了测试这个，我进入了rails控制台，并选择了一个特定的Bet对象，并使用以下命令运行check_bet方法：

1.9.2p320 :013 > Bet.last.check_bet
  Bet Load (2.8ms)  SELECT "bets".* FROM "bets" ORDER BY "bets"."id" DESC LIMIT 1
  Bet Load (0.9ms)  SELECT "bets".* FROM "bets" 
   (0.2ms)  BEGIN
   (0.3ms)  COMMIT
   (0.2ms)  BEGIN
   (0.3ms)  COMMIT
   (0.2ms)  BEGIN
   (0.2ms)  COMMIT
 => [#<Bet id: 3, name: "Newsroom", email: "email@email.com", reminder: "2013-07-30", details: "Mac and Will are going to get back together.", sent: false, created_at: "2013-07-29 17:23:13", updated_at: "2013-07-29 17:23:13">, #<Bet id: 4, name: "Testing", email: "email@email.com", reminder: "2013-07-29", details: "This is a test", sent: true, created_at: "2013-07-29 18:38:42", updated_at: "2013-07-29 20:17:34">, #<Bet id: 5, name: "Cheaper iPhone", email: "email@email.com", reminder: "2013-07-29", details: "I bet Dad that there will be a cheaper iphone in th...", sent: true, created_at: "2013-07-29 20:39:33", updated_at: "2013-07-29 20:50:14">, #<Bet id: 6, name: "My grades", email: "email@email.com", reminder: "2013-07-29", details: "My grades this year will be > 84% average", sent: true, created_at: "2013-07-29 20:56:18", updated_at: "2013-07-29 21:14:21">]

终端完成上述操作后，我的电子邮箱中充满了所有提醒他们的提醒= current_date的Bet对象。这证明SMTP设置正常，我的视图中的代码工作正常。

但是，当我尝试在所有下注对象上运行check_bet方法时，我收到一个未定义的方法错误：

1.9.2p320 :016 > Bet.all.check_bet
  Bet Load (1.8ms)  SELECT "bets".* FROM "bets" 
NoMethodError: undefined method `check_bet' for #<Array:0x007ffdd2c8c6c0>
    from (irb):16
    from /Users/bvlaar/.rvm/gems/ruby-1.9.2-p320@rails3tutorial/gems/railties-3.2.13/lib/rails/commands/console.rb:47:in `start'
    from /Users/bvlaar/.rvm/gems/ruby-1.9.2-p320@rails3tutorial/gems/railties-3.2.13/lib/rails/commands/console.rb:8:in `start'
    from /Users/bvlaar/.rvm/gems/ruby-1.9.2-p320@rails3tutorial/gems/railties-3.2.13/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>

另外，当我在终端中运行'bundle execnever'命令时，似乎没有任何东西被发送。

Answer 1

Bet.all会返回Array，但未定义check_bet方法。要在check_bet的每个实例上调用Bet，您需要执行Bet.all.each {|bet| bet.check_bet}或清除Bet.all.each(&:check_bet)（向@Ryan Bigg点头）。

有关性能方面的考虑，另请参阅http://guides.rubyonrails.org/active_record_querying.html#retrieving-multiple-objects-in-batches。

Answer 2

只要只是一个帮助您生成cron任务的gem，它就不会为您运行任何计划任务， crontab 会这样做。
我认为最好每小时运行一次调度程序
```
every :hour do
  runner "Bet.check_bet"
end 
```

然后，在你的Bet模型课中，你可以这样做：

class Bet < ActiveRecord::Base
  attr_accessible :details, :email, :name, :reminder, :sent

  # Sends user a reminder if current_date is equal to the reminder date of the bet
  def self.check_bet
    current_date = Time.now.strftime("%Y-%m-%d").to_s
    self.where(:reminder => current_date).each do |bet|
      BetMailer.bet_reminder(bet).deliver # later you can use some background job gem like sidekiq, rescue or delayed_job to send email, otherwise the performance might be a issue
      bet.update_attribute(:sent, true)
    end
   end 
 end
end

由于

在用户选择的日期发送电子邮件

2 个答案: