Rails OO views
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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.
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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‘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 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‘re call- ing attributes.
- 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 ]
- 22. protected - instance - variables
- 23. And tell me boy, 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!
- 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