Rails OO views

2 likes12,671 views

The document discusses various approaches for exposing instance variables from controllers to views in Ruby on Rails applications. It compares the pros and cons of using helper_method, decent_exposure, and obviews for this purpose. Examples are provided showing how to expose a post object from a PostsController to views using these different approaches. The discussion concludes by noting that the obviews gem for exposing instance variables is being released on RubyGems.

Technology Education

Markdown vs. MongoDB
A Journey through bleeding edge
technologies
for the NeXT Web

RubyMotion vs. Backbone
A Journey through bleeding edge
technologies
for the NeXT Web

def show
@post = Post.find(params[:id])
@title = @post.title
end

<h1><%= @post.title %></h1>
<p><%= @post.body %></p>

<html>
<head><title><%= @title %></title></head>
<body><%= yield %></body>
</html>

And tell me boy, what鈥榮 wrong
with my @ivars

My name鈥榮 Guybrush threepwood. I鈥榤 new in town
Matz told me their only for Object鈥榮 internal state
Who鈥榮 in charge here?
Nice talking to you.

When you design a class, you decide
what internal state it has and also
decide how that state is to appear on
the outside (to users of your class).

The internal state is held in instance
variables. The external state is
exposed through methods we鈥榬e call-
ing attributes.

# Define some internal variables that
# should not be propagated to the view.
self.protected_instance_variables = [
:@_status, :@_headers, :@_params, :@_env,
:@_response, :@_request, :@_view_runtime,
:@_stream, :@_url_options, :@_action_has_layout
]

And tell me boy, what ya
doing about this?

I鈥榣l stick with "helper_method".
Give me some "decent_exposure"?
It鈥榮 "obviews"!
I鈥榤 made of rubber, you鈥榬e made of glue.

helper_method
pros: rails standard
cons: verbose, bad semantics,
class level

decent_exposure
pros: easy syntax, good defaults
cons: class level

obviews
pros: easy syntax, action level
cons: unpublished

We want examples!

class PostsController < ApplicationController
expose :posts
def posts; Post.all; end
end

We want examples!

def show
expose post
end
def post; posts.find(params[:id]) end

We want examples!

def show
expose post: posts.find(params[:id])
end

We want examples!

<h1><%= pos title %></h1>
t.
<p><%= post.body %></p>

twitter: @elia
github: @elia
blog: dev.mikamai.com
blog: elia.schito.me

MIKAMAI

No monkeys were harmed during
the making of this keynote

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Rails OO views

1. Loading...

2. Markdown vs. MongoDB A Journey through bleeding edge technologies for the NeXT Web

3. RubyMotion vs. Backbone A Journey through bleeding edge technologies for the NeXT Web

6. Rails Views for the OO-savvy Rubyist

7. M V C

8. V C

9. Look at: Rails current implementation

10. def show @post = Post.find(params[:id]) @title = @post.title end

11. <h1><%= @post.title %></h1> <p><%= @post.body %></p>

12. <html> <head><title><%= @title %></title></head> <body><%= yield %></body> </html>

13. And tell me boy, what鈥榮 wrong with my @ivars My name鈥榮 Guybrush threepwood. I鈥榤 new in town Matz told me their only for Object鈥榮 internal state Who鈥榮 in charge here? Nice talking to you.

14. So how should I use @ivars?

15. When you design a class, you decide what internal state it has and also decide how that state is to appear on the outside (to users of your class).

16. The internal state is held in instance variables. The external state is exposed through methods we鈥榬e call- ing attributes.

17. Dave Thomas, Programming Ruby

18. Deep in the Rails source...

19. # Define some internal variables that # should not be propagated to the view. self.protected_instance_variables = [ :@_status, :@_headers, :@_params, :@_env, :@_response, :@_request, :@_view_runtime, :@_stream, :@_url_options, :@_action_has_layout ]

20. # Define some internal variables that # should not be propagated to the view. self.protected_instance_variables = [ :@_status, :@_headers, :@_params, :@_env, :@_response, :@_request, :@_view_runtime, :@_stream, :@_url_options, :@_action_has_layout ]

21. protected instance variables

22. protected - instance - variables

23. And tell me boy, what ya doing about this? I鈥榣l stick with "helper_method". Give me some "decent_exposure"? It鈥榮 "obviews"! I鈥榤 made of rubber, you鈥榬e made of glue.

24. helper_method pros: rails standard cons: verbose, bad semantics, class level

25. helper_method pros: rails standard cons: verbose, bad semantics, class level

26. helper_method pros: rails standard cons: verbose, bad semantics, class level

27. decent_exposure pros: easy syntax, good defaults cons: class level

28. decent_exposure pros: easy syntax, good defaults cons: class level

29. decent_exposure pros: easy syntax, good defaults cons: class level

30. obviews pros: easy syntax, action level cons: unpublished

31. obviews pros: easy syntax, action level cons: unpublished

32. obviews pros: easy syntax, action level cons: unpublished!

33. We want examples!

34. We want examples! class PostsController < ApplicationController expose :posts def posts; Post.all; end end

35. We want examples! def show expose post end def post; posts.find(params[:id]) end

36. We want examples! def show expose post: posts.find(params[:id]) end

37. We want examples! <h1><%= pos title %></h1> t. <p><%= post.body %></p>

39. Obviews

40. Obviews on rubygems shipping today!

41. Thank you !1

42. twitter: @elia github: @elia blog: dev.mikamai.com blog: elia.schito.me MIKAMAI No monkeys were harmed during the making of this keynote

43. twitter: @elia github: @elia blog: dev.mikamai.com blog: elia.schito.me MIKAMAI No monkeys were harmed during the making of this keynote

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