ActiveAdmin nested form on #show page

activeadmin, ruby-on-rails, ruby-on-rails-3

Solution

I use the following recipe when adding this type of info to a show page

    ActiveAdmin.register Post do
      show :title => :email do |post|
        attributes_table do
          row :id
          row :first_name
          row :last_name
        end
        div :class => "panel" do
          h3 "Comments"
          if post.comments and post.comments.count > 0
            div :class => "panel_contents" do
              div :class => "attributes_table" do
                table do
                  tr do
                    th do
                      "Comment Text"
                    end
                  end
                  tbody do
                    post.comments.each do |comment|
                      tr do
                        td do
                          comment.text
                        end
                      end
                    end
                  end
                end
              end
            end
          else
            h3 "No comments available"
          end
        end
      end
    end

Problem

Is it possible to add nested form to #show page? Now i have my admin/posts.rb: ``` ActiveAdmin.register Post do show do |post| h2 post.title post.comments.each do |comment| row :comment do comment.text end end end end ``` It lists all the comments for post. Now i need a form to add new comments. I'm trying to do like this: ``` ActiveAdmin.register Post do show do |post| h2 post.title post.comments.each do |comment| row :comment do comment.text end end form do |f| f.has_many :comments do |c| c.input :text end end end end ``` and get an error: undefined method `has_many' for <form></form> :Arbre::HTML::Form Models for Post and Comments look like: ``` class Post < ActiveRecord::Base has_many :comments accepts_nested_attributes_for :comments end class Comment < ActiveRecord::Base belongs_to :post end ``` How do i add that form to my show page? Thanks

Original source