ruby-on-rails - 在 Rails 中，如何将私有(private)方法共享给嵌套 Controller ？

Question

我有一个 Player 资源，其中包含各种嵌套资源，例如:Measurable 和 Workout。

我有一个变量用于 Player 页面上的 header ，无论我是从 Player_Controller 还是从其他嵌套资源 Controller 之一访问操作，我都需要设置一个变量。我怎样才能干涸我的代码以在某处添加该变量，这样我就不必在每个 Controller 中包含相同的代码......如下所示:

播放器 Controller

class PlayersController < ApplicationController
   before_action :set_measurable_summary

   #...

   private
     def set_measurable_summary
       @measurable_summary = @player.measurable_summary
     end
end

锻炼 Controller

class Players::WorkoutsController < ApplicationController
   before_action :set_measurable_summary

   #...

   private
     def set_measurable_summary
       @measurable_summary = @player.measurable_summary
     end
end

Answer 1

这可以通过 concern 轻松完成。 :

# app/controllers/concerns/measurable_summary.rb

module MeasurableSummary
  extend ActiveSupport::Concern

  included do
    before_action :set_measurable_summary
  end

  private

  def set_measurable_summary
    @measurable_summary = @player.measurable_summary
  end
end

然后将其包含到您的 Controller 中:

class PlayersController < ApplicationController
  include MeasurableSummary
  ...
end

class Players::WorkoutsController < ApplicationController
  include MeasurableSummary
  ...
end