Question

我有很多使用PaperTrail的模型，例如：

class User < ActiveRecord::Base
  has_paper_trail
end

在ActiveAdmin模型的文件中，我有：

ActiveAdmin.register User do

  ...

  # versioning part
  action_item :history, only: :show do
    link_to('History', history_backend_user_path(user), method: :get)
  end

  sidebar :versionate, :partial => "layouts/version", :only => :show

  member_action :history do
    @user = User.find(params[:id])
    @versions = @user.versions.reorder(created_at: :desc)
    render "layouts/history"
  end
end

我必须为每个模型重复这一行，我想知道如何干掉它。

Answer 1

尝试将公共代码分离为关注点。然后，您可以使用ActiveAdmin的include方法将公共代码合并到您的资源中。

以下是应包含公共代码的模块：

# app/admin/concerns/versionable.rb
module Versionable
  def self.included(dsl)
    dsl.action_item :history, only: :show do
      link_to 'History', dsl.history_backend_user_path(user), method: :get
    end

    dsl.sidebar :versionate, :partial => "layouts/version", :only => :show

    dsl.member_action :history do
      @user = User.find(params[:id])
      @versions = @user.versions.reorder(created_at: :desc)
      render "layouts/history"
    end
  end
end

然后，您可以在ActiveAdmin资源中包含此模块。例如：

# app/admin/user.rb
ActiveAdmin.register User do
  include Versionable
  ...
end

这基于this Stack Overflow post。它尚未经过测试。

Answer 2

我最终得到了以下解决方案正在运行（另请注意，所有对User资源的引用都已被推广）：

# app/admin-shared/active_admin_loggable.rb

module ActiveAdminLoggable
  def self.extended(base)
    base.instance_eval do
      action_item :history, only: :show do
        link_to('History',
                eval("history_backend_#{resource.class.to_s.downcase}_path(#{resource.class.to_s.downcase})"),
                method: :get
        )
      end

      sidebar :versionate, :partial => "layouts/version", :only => :show

      member_action :history do
        @this_resource = eval("resource.class").find(params[:id])
        @versions = @this_resource.versions.reorder(created_at: :desc)
        render "layouts/history"
      end
    end
  end
end

和

# app/admin/user.rb
ActiveAdmin.register User do
  extend ActiveAdminLoggable
  ...
end

Rails - ActiveAdmin和Papertrail - DRY方法

2 个答案: