在rails mailer上调用deliver_later之前存储当前的可选路由范围

Posted 2023-03-14

【中文标题】在rails mailer上调用deliver_later之前存储当前的可选路由范围

【英文标题】：Storing current optional route scope before calling deliver_later on rails mailer

【发布时间】：2016-12-05 04:07:25

【问题描述】：

导轨 4.2 红宝石 2.3

我有两个与区域设置信息相关的可选路由范围。它们在配置 default_url_options 方法的application_controller 中的before_action 中设置。即

# app/controllers/application_controller
# simplified version, usually has two locale values, 
# locale_lang and locale_city


before_action :redirect_to_locale_unless_present

private

# If params[:locale] is not set then
# redirect to the correct locale base on request data    
def redirect_to_locale_unless_present
  unless params[:locale].present?
    redirect_to url_for(locale: request.location.country_code)
  end
end

def default_url_options(options = 
   locale_lang: params[:locale_lang] .merge(options)
end

范围是 locale_lang 和 locale_city 最终看起来像 http://localhost:3000/fr/ 或 http://localhost:3000/en/

这一切都在浏览器中按预期工作，但是我想利用 ActionMailer::DeliveryJob 在后台进程中发送电子邮件。明显的问题是 ActionMailer::DeliveryJob 不存储 params[:locale] 的值。

我希望能够调用SomeMailer.generic_email(options).deliver_later 并将当前的default_url_options 发送到ActionMailer::DeliveryJob，然后它将沿着链传递并在实际处理邮件时使用它们。我当然可以将 default_url_options 定义为每个 Mailer 方法的参数，但我更愿意将应用程序设置为自动包含在内。

您是否遇到过此问题或对如何处理任务有任何建议。请记住，它也应该是线程安全的。

我目前失败的方法是将当前 request 保存在 Thread.current 中，然后在通过 调用 enqueue_delivery 时检索它们.deliver_later。然后我想重写 ActionMailer::DeliveryJob 的 perform 方法来接受 url_options 并使用 class_eval 来定义当前邮件程序类中的 default_url_options 方法。 但是，使用 Deliver_later 时似乎甚至没有调用 perform 任何想法？

class ApplicationController
  before_action :store_request

  private

  def store_request
    Thread.current['actiondispatch.request'] = request
  end
end

module DeliverLaterWithLocale
  module MessageDeliveryOverrides
    def enqueue_delivery(delivery_method, options=)
      args = [
        @mailer.name,
        @mail_method.to_s,
        delivery_method.to_s,
        url_options,
        *@args
      ]
      ActionMailer::DeliveryJob.set(options).perform_later(*args)
    end

    private

    def url_options
      options = 
      request  = Thread.current["actiondispatch.request"]
      if request
        host     = request.host
        port     = request.port
        protocol = request.protocol
        lang = request.params[:locale_lang]
        city = request.params[:locale_city]
        standard_port = request.standard_port
        options[:protocol] = protocol
        options[:host]     = host
        options[:port]     = port if port != standard_port
        options[:locale_lang] = lang
        options[:locale_city] = city
      end
      ActionMailer::Base.default_url_options.merge(options)
    end
  end

  module DeliveryJobOverrides
    def perform(mailer, mail_method, delivery_method, url_options, *args)
      mailer = mailer.constantize.public_send(mail_method, *args)
      Kernel.binding.pry
      mailer.class_eval <<-RUBY, __FILE__, __LINE__ + 1
        def default_url_options_with_options(*args)
          default_url_options_without_current_request(*args).merge(url_options)
        end
        alias_method_chain :default_url_options, :options
      RUBY
      mailer.send(delivery_method)
    end
  end
end

【参考方案1】：

以防其他人想要这样做。我通过添加来修复它

class ApplicationController
  before_action :store_request

  private

  def store_request
    Thread.current['actiondispatch.request'] = request
  end
end

module DeliverLaterWithLocale
  module MessageDeliveryOverrides
    def enqueue_delivery(delivery_method, options=)
      args = [
        @mailer.name,
        @mail_method.to_s,
        delivery_method.to_s,
        url_options,
        *@args
      ]
      ActionMailer::DeliveryJob.set(options).perform_later(*args)
    end

    private

    def url_options
      options = 
      request  = Thread.current["actiondispatch.request"]
      if request
        host     = request.host
        port     = request.port
        protocol = request.protocol
        lang = request.params[:locale_lang]
        city = request.params[:locale_city]
        standard_port = request.standard_port
        options[:protocol] = protocol
        options[:host]     = host
        options[:port]     = port if port != standard_port
        options[:locale_lang] = lang
        options[:locale_city] = city
      end
      ActionMailer::Base.default_url_options.merge(options)
    end
  end

  module DeliveryJobOverrides
    def perform(mailer, mail_method, delivery_method, url_options, *args)
      mailer = mailer.constantize
      mailer.default_url_options = url_options
      mailer.public_send(mail_method, *args).send(delivery_method)
    end
  end
end

然后将这些添加到初始化程序中的各个类