The document provides steps for setting up a blog using Ruby on Rails, including generating a scaffold for posts with name, title, and content fields, generating a comment model that belongs to posts, and configuring routes and controllers to display posts and allow adding comments to posts. Models are generated for posts and comments with associations defined, and views are added to display posts and comments. The steps shown configure a basic blog application with posts and associated comments.

1. Junli Blog
Cocoa on Rails
3rd
2011-7-18

2. Blog

4. >rails new blog

5. Gems
>cd blog
>bundle install

6. SQLite3

7. >rake db:create

8. Web
>rails server
or
>rails s

9. http://127.0.0.1:3000
127.0.0.1
3000

10. Say hello
>rails generate controller home index
app/views/home/index.html.erb
index.html.erb
<h1> Hello, Junli </h1>

11. public/index.html

12. config/routes.rb
root
root :to => “home#index”
Rails root home controller

13. Post
>rails generate scaffold Post name:string
title:string content:text
rake db:migrate

14. Comment model
>rails generate model Comment
commenter:string body:text post:references
rake db:migrate
rails generate

15. comment.rb
app/models/comment.rb
class Comment < ActiveRecord::Base
belongs_to :post
end

16. Models
Models (post) (comment)

17. Models post.rb
post.rb
class Post < ActiveRecord::Base
...
has_many :comments
end
@post.comments

18. config/route.rb
resources :post do
resources :comments
end

19. Controller
>rails generate controller Comments

20. Post show
app/views/posts/show.html.erb
http://dpaste.com/hold/570758/

21. CommentsController
create action
class CommentsController < ApplicationController
def create
@post = Post.find(params[:post_id])
@comment = @post.comments.create(params[:comment])
redirect_to post_path(@post)
end
end

22. Done
Post

23. Blog
https://github.com/snowdon/blog