Rails: ActiveAdmin.register_page でのアクションの作り方とはまりどころ。 ref: http://qiita.com/Yinaura/items/3572d34e1c00f9f5533e

file0.txt

ActiveAdmin.register_page "AuthorPage" do
  content do
    panel 'メニュー' do
      link_to '新規作成', admin_authorpage_new_path
    end
    table_for authors do
      column "名前", :name
      column "性別", :gender
      column ("name_changed"){ |author| author.name_changed }
      column ("編集"){ |author| link_to('編集する', admin_authorpage_edit_path(id: author.id)) }
    end
  end

  page_action :new, method: :get
  page_action :create, method: :post
  page_action :update, method: :post

  page_action :edit, method: :get do
  end

  controller do
    layout 'active_admin', only: [:edit, :new]

    def index
      @authors = Author.all
    end

    def new
    end

    def create
      Author.create(params.require(:author).permit(:name, :gender))
      flash[:notice] = '作成しました。'
      redirect_to admin_authorpage_path
    end

    def update
      flash[:notice] = '編集しました。'
      author = Author.find(params[:author][:id])
      author.update(params.require(:author).permit(:name, :gender))
      redirect_to admin_authorpage_edit_path(id: params[:author][:id])
    end

    def edit
      @author = Author.find(params[:id])
    end
  end
end