Forum: Ruby on Rails Code from famous RoR video?

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Mark W. (Guest)
on 2005-12-15 21:56
Does anyone know where I could get text file with the code from the
famous video where they create a Weblog in 15 minutes -- The one that's
here: href="

(I can't just watch it here at work, and I'd like to avoid having to
re-type everything in any case.)

Ernie O. (Guest)
on 2005-12-15 22:01
(Received via mailing list)
I think typing it out is part of the learning process.
There really isn't that much to it, and there are some commandline
you'll have to run anyway.
Mark W. (Guest)
on 2005-12-15 23:04
I appreciate your concern for proper pedagogy, but I just want to get a
look at the code.

Anyone know if it's on the net anywhere?
Peter M. (Guest)
on 2005-12-16 06:36
(Received via mailing list)
When I first watched it I thought a transcript would be nice since the
is sooooo freakin' fast:)
Raz (Guest)
on 2005-12-16 10:06
(Received via mailing list)
Well, you can always pause and take a shot of the screen - for

Vivek K. (Guest)
on 2005-12-16 10:42
(Received via mailing list)
> On 16/12/05, Peter M. <removed_email_address@domain.invalid> wrote:
> > When I first watched it I thought a transcript would be nice since the
> video
> > is sooooo freakin' fast:)

me too..i thought it was made fast just to emphasize how super
rails is..rails has lived up to it i must say.
Justin F. (Guest)
on 2005-12-16 14:50
(Received via mailing list)
Peter M. wrote:
> When I first watched it I thought a transcript would be nice since the
> video is sooooo freakin' fast:)

Not a transcript of the soundtrack (Whoops!), but these are the steps
being demonstrated, with some notes in []:

In terminal session in ~/demos directory

$ rails brablog
$ cd brablog
$ ./script/server

[don't really need ./ in front of any script/xxx commands]

copy URL to Safari, see Congrats page

In a new terminal session

$ cd demos/brablog
$ e .
[opens the directory in TextMate - 'mate' is the usual command]
$ ./script/generate controller
$ ./script/generate controller blog

Open app/controllers/blog_controller.rb in TextMate

browse action responded to index

In blog_controller.rb, add

   def index
     render :text => "Hello World!"

Refresh brower - see "Hello World!"

Remove "render :text" line from controller

Create new file index.rhtml in app/views/blog,

hello from the template

Refresh browser - see "hello from the template"

remove action method completely, refresh browser - still works

Edit config/database.yml

   adapter: mysql
   database: blog_development
   username: root

   adapter: mysql
   database: blog_test
   username: root


In CocoaMySQL, connected as root@localhost,
create new database: blog_development
create new table: posts
(structure tab)
id int not null auto_increment primary key
title varchar(255)

[table type should be InnoDB]

Restart WEBrick in first terminal session

Back in second terminal,

$ ./script generate model
(see the help for this generator)

$ ./script/generate model Post

In TextMate, show app/models/post.rb
then edit blog_controller.rb, adding:

   scaffold :post

Refresh browser - see Listing posts page
New post "Hello Brazil!"
(don't save)

In CocoaMySQL, add a field named 'body' with type text.
(click off the row to save the change)

Refresh browser - see the body text area
Enter "Yes, yes, hello indeed!" and click Update
Edit (don't save)

In CocoaMySQL, add a field name 'created_at' with type datetime.
(click off the row to save the change)

Refresh browser - see the date/time selectors - want to move them above
the body - return to CocoaMySQL, and drag the created_at field above the
body field.

Refresh browser. Change the seconds, click Update.
Back to list
New post (don't enter anything yet)

In TextMate, in app/models/post.rb, add

   validates_presence_of :title

in browser, click Create - see validation error
[I don't see style on error summary; do see red border on field.]

Put in title: "Better fill it in, then!"
Put in body: "Aye, aye, sir"
click Create - ok

In terminal,
$ ./script/generate scaffold
(see help)
$ ./script/generate scaffold Post Blog
(answer 'a' to the prompt about overwriting blog_controller.rb)

Refresh the browser - still see list of posts.

In TextMate, show all the new methods in blog_controller.rb
Fold them all (shift-command-2 toggles folding at level 2)

Open app/views/blog/list.rhtml, and change it to:

<h1>My wonderful weblog</h1>

<% for post in @posts %>
     <h2><%= link_to post.title, :action => 'show', :id => post %></h2>
     <p><%= post.body %></p>
       <%= post.created_at.to_s(:long)%>
       (<%= link_to 'Edit', :action => 'edit', :id => post %>)
<% end %>

<%= link_to 'New post', :action => 'new' %>

[should escape user-entered text with h()]

Refresh the browser - looks good.

Show that the show and edit functionality is still the same.

New post,
   title "Let's just add a third, for good measure"
   body "Oh yeah"
Create - see the list.

We want the latest post to be at the top.
[Note that the app is depending on order of records retrieved,
  with no ORDER BY in the SQL]

In app/views/blog/list.rhtml change the for loop to be

<% for post in @posts.reverse %>

Refresh the browser

Edit the "Better fill it in, then!" post, changing the body
to "Aye, *aye*, _sir_"
click Edit

In app/views/blog/list.rhtml change

     <p><%= post.body %></p>


     <p><%= textilize(post.body) %></p>

Now we want to use the same formatting in show and in list...

In app/controllers/blog_controller.rb, edit the list method to be

   def list
     @posts = Post.find(:all)

[could put ordering by created_at here]

In app/views/blog/list.rhtml select the whole div within the for loop,
cut it, paste it into a new file app/views/blog/_post.rhtml, then save.

Back in app/views/blog/list.rhtml, replace the now-empty for loop by

<%= render :partial => "post", :collection => @posts.reverse %>

Now edit app/views/blog/show.rhtml. Delete the for loop and
replace it with

<%= render :partial => "post", :object => @post %>

In the browser, show the "Better fill it in, then!" comment.

[Note - the partial includes show and edit links - don't need
the other edit link at the bottom]

Now implement comments on posts:

In the terminal,

$ ./script/generate model Comment

In app/models/comment.rb, add

   belongs_to :post

In app/models/post.rb, add

   has_many :comments

In CocoaMySQL, create table 'comments' with fields
   id int auto_increment primary key
   body text
   post_id int

In the Contents tab, populate a row with post_id 1, and body
"Yes, I agree with the hello!"

In app/views/blog/show.rhtml, at the bottom, add

<% for comment in @post.comments %>
     <%= comment.body %>
<% end %>

Browse to show this item, see that the comment is there, but it's
displayed right after the Back link.

In app/views/blog/show.rhtml, after the Back link, add


Check in browser. Now we need to be able to add comments.
In app/views/blog/show.rhtml, at the bottom, add

<%= form_tag :action => 'comment', :id => @post %>
   <%= text_area "comment", "body" %><br/>
   <%= submit_tag "Comment!"%>

Check that this displays in the browser, then come back and
wire it into the application:

In the controller, add

   def comment
     flash[:notice] = "Added your comment."
     redirect_to :action => "show", :id => params[:id]

Refresh the browser, then add a comment "Me too, me too!"

Go back to the list.

Now look at the statistics for this project: in the terminal

$ rake stats

Look at the log:

$ tail -f log/development.log

Show the log updating as a post is shown in the browser.

In CocoaMySQL, create database 'blog_test'.

In the terminal, Ctrl-C out of tail, then

$ rake test_units
See tests run, 2 tests, 2 assertions, 0 failures, 0 errors

Put in a real test: in test/unit/post_test.rb, add setup method
[was already there in movie, not in Rails 1.0]

   def setup
     @post = Post.find(1)

and replace the test_truth method with:

   def test_adding_comment
     @post.comments.create :body => "My new comment"
     @assert_equal 1, @post.comments.size

$ rake test_units succeeds

Break the test, by comparing with 2 rather than 1 - see the test fail:

   1) Failure:
test_adding_comments(PostTest) [./test/unit/post_test.rb:13]:
<2> expected but was

Now look at the console:

$ ./script/console
Loading development environment
 >> p = Post.find :first
=> #<Post:0x245d12c @attributes={"title"=>"Hello Brazil!", "body"=>"Yes,
yes, hello indeed!", "id"=>"1", "created_at"=>"2005-06-02 20:43:00"}>
 >> p.title = "Hello Denmark!"
=> "Hello Denmark!"
=> true

Look at the list in the browser - see the change.

Back in the console:

 >> p.comments.create :body => "Greeting to the cold north"
=> #<Comment:0x244813c @attributes={"body"=>"Greeting to the cold
north", ...>
 >> p.comments.create :body => "Greeting to the super, super cold north"
=> #<Comment:0x243ee20 @attributes={"body"=>"Greeting to the super,
 >> p.comments
=> [#<Comment:0x2446af8 @attributes={"body"=>"Yes, I agree with the

Look at the list in the browser, show the Hello Denmark! post,
and see the comments.

Back in the console:

 >> p.destroy
=> #<Post:0x229bbcc @attributes={"body"=>"Yes, >
[structure here is different from that in the movie]

Look at the list in the browser - the post has gone.

[But looking in CocoaMySQL, the comments haven't.]

that's it!


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