Rails before_action for ActionMailer 将使用邮件程序参数

假设我有一个发送不同电子邮件的邮件程序，但预计会使用相同的参数进行调用。我想为所有邮件程序操作处理这些参数。所以，调用一个before_action这将读取发送到邮件程序方法的参数

/mailers/my_mailer.rb
class MyMailer < ApplicationMailer
    before_filter do |c|
      # c.prepare_mail # Will fail, because I need to pass `same_param` arguments
      # # I want to send the original arguments
      # c.prepare_mail(same_param) # How do I get `same_param` here ?
    end

    def action1(same_param)
      # email view is going to use @to, @from, @context    
      method_only_specific_to_action1
    end

    def action2(same_param)
      # email view is going to use @to, @from, @context
      method_only_specific_to_action2
    end

    private
      def prepare_mail(same_params)
        @to = same_params.recipient
        @from = same_params.initiator
        @context = same_params.context
      end
    end

然后在我的控制器/服务中我在某个地方做

MyMailer.actionx(*mailer_params).deliver_now

我怎样才能访问same_param里面的参数列表before_action block ?

EDIT :

我想重构

/mailers/my_mailer.rb
class MyMailer < ApplicationMailer

    def action1(same_param)
      @to = same_params.recipient
      @from = same_params.initiator
      @context = same_params.context   
      method_only_specific_to_action1
    end

    def action2(same_param)
      @to = same_params.recipient
      @from = same_params.initiator
      @context = same_params.context   
      method_only_specific_to_action2
    end

    def actionx
      ... 
    end
  end

而这次重构

/mailers/my_mailer.rb
class MyMailer < ApplicationMailer

    def action1(same_param)
      prepare_mail(same_params)   
      method_only_specific_to_action1
    end

    def action2(same_param)
      prepare_mail(same_params)   
      method_only_specific_to_action2
    end

    def actionx
      ... 
    end

    private
      def prepare_mail(same_params)
        @to = same_params.recipient
        @from = same_params.initiator
        @context = same_params.context
      end
    end

感觉不是最佳的（prepare_mail(same_params)每个动作都重复）

因此上面建议的

ActionMailer 使用AbstractController::Callbacks模块。我尝试过，它似乎对我有用。

The code

class MyMailer < ApplicationMailer
  def process_action(*args)
    # process the args here
    puts args
    super
  end

  def some_mail(*args)
  end
end

MyMailer.some_mail(1, 2) #=> prints ['some_mail', 1, 2]

文档 http://api.rubyonrails.org/classes/AbstractController/Callbacks.html#method-i-process_action

UPDATE

如果你使用的是Rails 5.1，你可以看看ActionMailer::参数化 http://api.rubyonrails.org/v5.1/classes/ActionMailer/Parameterized.html