Downloaded 12 times
![def show
@post = Post.find(params[:id])
@title = @post.title
end](https://image.slidesharecdn.com/railsooviews-120619114525-phpapp01/75/Rails-OO-views-10-2048.jpg)
![# 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
]](https://image.slidesharecdn.com/railsooviews-120619114525-phpapp01/75/Rails-OO-views-19-2048.jpg)
![# 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
]](https://image.slidesharecdn.com/railsooviews-120619114525-phpapp01/75/Rails-OO-views-20-2048.jpg)
![We want examples!
def show
expose post
end
def post; posts.find(params[:id]) end](https://image.slidesharecdn.com/railsooviews-120619114525-phpapp01/75/Rails-OO-views-35-2048.jpg)
![We want examples!
def show
expose post: posts.find(params[:id])
end](https://image.slidesharecdn.com/railsooviews-120619114525-phpapp01/75/Rails-OO-views-36-2048.jpg)
Uploaded byElia Schito
Rails OO 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.
Rails OO views
- 1.
- 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.
- 9. Look at: Railscurrent 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 meboy, what‘s wrong with my @ivars My name‘s Guybrush threepwood. I‘m new in town Matz told me their only for Object‘s internal state Who‘s in charge here? Nice talking to you.
- 14. So how should Iuse @ivars?
- 15. When you designa 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 stateis held in instance variables. The external state is exposed through methods we‘re call- ing attributes.
- 17.
- 18. Deep in theRails source...
- 19. # Define someinternal 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 someinternal 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.
- 22. protected - instance- variables
- 23. And tell meboy, what ya doing about this? I‘ll stick with "helper_method". Give me some "decent_exposure"? It‘s "obviews"! I‘m made of rubber, you‘re 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.
- 34. We want examples! classPostsController < ApplicationController expose :posts def posts; Post.all; end end
- 35. We want examples! defshow expose post end def post; posts.find(params[:id]) end
- 36. We want examples! defshow expose post: posts.find(params[:id]) end
- 37. We want examples! <h1><%=pos title %></h1> t. <p><%= post.body %></p>
- 39.
- 40.
- 41.
- 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