Trees with Ancestry

Today I have been studying a railscasts for trees with Ancestry.

"http://railscasts.com/episodes/262-trees-with-ancestry?view=asciicast"

First of all, I created the model for Message. The problem is the model Message appears empty in the example code. To have the example running before using Ancestry, you need the following code:

class Message < ActiveRecord::Base
  attr_accessible :content
end

And the schema has to be:

  create_table "messages", :force => true do |t|
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
    t.text     "content"
  end

A thing that I made different from the railscast is using simple_form for the form. The code I used is:

<%= simple_form_for @message, html: { class: 'form-horizontal' } do |f| %>
  <%= f.error_notification %>
  <%= f.hidden_field :parent_id %>
  <%= f.input :content, label: 'New Message', :input_html => { :rows => 8 } %>
  <%= f.button :submit, "Post Message" %>
<% end %>

I wasn't able to apply an indent in the nested messages using css, but at least I have ancestry running.

Step by step.