如何在 ActiveAdmin 中处理多个嵌套资源？

Question

我将 ActiveAdmin (0.4.0) 与 Rails (3.1.1) 一起使用。

我找不到处理多个嵌套资源的好方法/hack。

考虑 3 个模型：

class Program < ActiveRecord::Base
  has_many :knowledges, :dependent => :destroy
end

class Knowledge < ActiveRecord::Base
  belongs_to :program
  has_many :steps, :dependent => :destroy
end

class Step < ActiveRecord::Base
  belongs_to :knowledge
end

还有 ActiveAdmin 资源：

ActiveAdmin.register Program do
end

ActiveAdmin.register Knowledge do
  belongs_to :program
end

ActiveAdmin.register Step do
  belongs_to :knowledge
end

在 routes.rb 中：

namespace :admin do
  resources :programs do
    resources :knowledges do
      resources :steps
    end
  end
end

这里是程序索引、知识和步骤的网址：
http://localhost:3000/admin/programs
http://localhost:3000/admin/programs/1/knowledges
http://localhost:3000/admin/programs/1/knowledges/1/steps

“知识”管理员没有问题，但“步骤”管理员不保留嵌套上下文。

例如，当我在 steps#index 中使用过滤器时，我被重定向到：
http://localhost:3000/admin/knowledges/1/steps?params...
但一定是：
http://localhost:3000/admin/programs/1/knowledges/1/steps?params...

创建新资源时同样的问题：
http://localhost:3000/admin/knowledges/1/steps/new
而不是：
http://localhost:3000/admin/programs/1/knowledges/1/steps/new

面包屑也有同样的问题……等等……

到目前为止我在 app/admin/steps.rb 中尝试过的内容：

ActiveAdmin.register Step do

  belongs_to :knowledge

  config.clear_action_items!
  action_item :only => :index do
    link_to('Create Step', new_admin_program_knowledge_step_path(knowledge.program.id, knowledge.id))
  end

  index do
    column :id
    column :knowledge
    column :title
    column "Actions" do |step|
      link_to("Voir", admin_program_knowledge_step_path(step.knowledge.program, step.knowledge, step), :class => "member_link show_link") +\
      link_to("Editer", edit_admin_program_knowledge_step_path(step.knowledge.program, step.knowledge, step), :class => "edit_knowledge member_link edit_link", :id => "knowledge_#{dom_id(knowledge)}") +\
      link_to("Supprimer", admin_program_knowledge_step_path(step.knowledge.program, step.knowledge, step), :class => "member_link delete_link", :method => :delete, :confirm => "Delete?")
    end
  end

  filter :id
  filter :title
  filter :subtitle
  filter :stage_type
  filter :order_by
  filter :created_at
  filter :updated_at

  form :partial => "form"

end

在 app/views/admin/steps/_form.html.erb 我必须使用 activeadmin 表单构建器：

<%= semantic_form_for(resource, :url => admin_program_knowledge_steps_path(resource.knowledge.program, resource.knowledge), :builder => ActiveAdmin::FormBuilder) do |f|
  f.inputs "Step" do
    f.input :knowledge, :as => :hidden
    f.form_buffers.last << f.template.content_tag(:li, f.template.content_tag(:label, "Knowledge")+f.template.content_tag(:p, f.object.knowledge.title))
    f.input :title
    f.input :order_by
  end
  f.buttons
end %>

嗯...我卡住了。

如何很好地处理这个问题？任何线索表示赞赏...

Answer 1

嗯，解决方法很简单... https://github.com/josevalim/inherited_resources

ActiveAdmin.register Step do
  controller do
    nested_belongs_to :program, :knowledge
  end
end