在用户选择的日期发送电子邮件 [英] Sending emails on user-selected dates
问题描述
我的应用涉及到人们进入主页，输入他们下注的名称(为了好玩)、他们的电子邮件地址、他们希望收到提醒的日期以及一些有关下注的详细信息.我正在使用每当 gem 每天运行一次.
My app involves people coming to a home page, entering a name of a bet they've made (for fun), their email address, a date they would like to be reminded, and some details about the bet. I am using the whenever gem to have this run once a day.
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 等于他们想要被提醒的日期(提醒)时，我已经成功地发送了电子邮件.为了测试这一点，我进入了 rails 控制台，并选择了一个特定的 Bet 对象，并使用以下命令在其上运行 check_bet 方法:
I have been successful in having emails sent when the current_date is equal to the date they wanted to be reminded on (reminder). To test this, I've gone into the rails console, and selected a particular Bet object, and ran the check_bet method on it using:
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，我的邮箱里就装满了所有的 Bet 对象，它们的提醒 = current_date.这证明 SMTP 设置工作正常，并且我视图中的代码工作正常.
After the terminal completes the above, my email box is full of all of the Bet objects that have their reminder = current_date. This proves the SMTP settings are working, and the code in my views is working fine.
但是，当我尝试在所有投注对象上运行 check_bet 方法时，我收到一个未定义的方法错误:
However, when I try running the check_bet method on all of the bet objects, I receive an undefined method error:
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>
'
此外，当我在终端中运行bundle exec Every"命令时，似乎没有发送任何内容.
In addition, when I run the 'bundle exec whenever' command in terminal, nothing seems to get sent.
推荐答案
Bet.all 返回一个 Array，check_bet 方法用于该数组没有定义.要在 Bet 的每个实例上调用 check_bet，您需要执行 Bet.all.each {|bet|bet.check_bet} 或更简洁的 Bet.all.each(&:check_bet)(向 @Ryan Bigg 致敬).
Bet.all returns an Array, for which the check_bet method is not defined. To invoke check_bet on each instance of Bet, you need to do Bet.all.each {|bet| bet.check_bet} or the cleaner Bet.all.each(&:check_bet) (with nod to @Ryan Bigg).
另见 http://guides.rubyonrails.org/active_record_querying.html#retrieving-multiple-objects-in-batches，出于某些性能考虑.
See also http://guides.rubyonrails.org/active_record_querying.html#retrieving-multiple-objects-in-batches, for some performance considerations.
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