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adding episode 163

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1 parent 328a93d commit 8119e42647cbf5ffe97080582a02978eead46583 @ryanb committed May 24, 2009
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  1. +8 −0 episode-163/README
  2. +3 −0 episode-163/friends/.gitignore
  3. +243 −0 episode-163/friends/README
  4. +10 −0 episode-163/friends/Rakefile
  5. +11 −0 episode-163/friends/app/controllers/application_controller.rb
  6. +19 −0 episode-163/friends/app/controllers/friendships_controller.rb
  7. +22 −0 episode-163/friends/app/controllers/sessions_controller.rb
  8. +24 −0 episode-163/friends/app/controllers/users_controller.rb
  9. +3 −0 episode-163/friends/app/helpers/application_helper.rb
  10. +2 −0 episode-163/friends/app/helpers/friendships_helper.rb
  11. +23 −0 episode-163/friends/app/helpers/layout_helper.rb
  12. +2 −0 episode-163/friends/app/helpers/sessions_helper.rb
  13. +2 −0 episode-163/friends/app/helpers/users_helper.rb
  14. +4 −0 episode-163/friends/app/models/friendship.rb
  15. +43 −0 episode-163/friends/app/models/user.rb
  16. +33 −0 episode-163/friends/app/views/layouts/application.html.erb
  17. +15 −0 episode-163/friends/app/views/sessions/new.html.erb
  18. +13 −0 episode-163/friends/app/views/users/index.html.erb
  19. +24 −0 episode-163/friends/app/views/users/new.html.erb
  20. +23 −0 episode-163/friends/app/views/users/show.html.erb
  21. +110 −0 episode-163/friends/config/boot.rb
  22. +22 −0 episode-163/friends/config/database.yml
  23. +41 −0 episode-163/friends/config/environment.rb
  24. +17 −0 episode-163/friends/config/environments/development.rb
  25. +28 −0 episode-163/friends/config/environments/production.rb
  26. +28 −0 episode-163/friends/config/environments/test.rb
  27. +7 −0 episode-163/friends/config/initializers/backtrace_silencers.rb
  28. +10 −0 episode-163/friends/config/initializers/inflections.rb
  29. +5 −0 episode-163/friends/config/initializers/mime_types.rb
  30. +19 −0 episode-163/friends/config/initializers/new_rails_defaults.rb
  31. +15 −0 episode-163/friends/config/initializers/session_store.rb
  32. +5 −0 episode-163/friends/config/locales/en.yml
  33. +10 −0 episode-163/friends/config/routes.rb
  34. +15 −0 episode-163/friends/db/migrate/20090523212130_create_users.rb
  35. +13 −0 episode-163/friends/db/migrate/20090523231751_create_friendships.rb
  36. +30 −0 episode-163/friends/db/schema.rb
  37. +2 −0 episode-163/friends/doc/README_FOR_APP
  38. +37 −0 episode-163/friends/lib/authentication.rb
  39. +30 −0 episode-163/friends/public/404.html
  40. +30 −0 episode-163/friends/public/422.html
  41. +30 −0 episode-163/friends/public/500.html
  42. 0 episode-163/friends/public/favicon.ico
  43. +2 −0 episode-163/friends/public/javascripts/application.js
  44. +963 −0 episode-163/friends/public/javascripts/controls.js
  45. +973 −0 episode-163/friends/public/javascripts/dragdrop.js
  46. +1,128 −0 episode-163/friends/public/javascripts/effects.js
  47. +4,320 −0 episode-163/friends/public/javascripts/prototype.js
  48. +5 −0 episode-163/friends/public/robots.txt
  49. +104 −0 episode-163/friends/public/stylesheets/application.css
  50. +4 −0 episode-163/friends/script/about
  51. +3 −0 episode-163/friends/script/console
  52. +3 −0 episode-163/friends/script/dbconsole
  53. +3 −0 episode-163/friends/script/destroy
  54. +3 −0 episode-163/friends/script/generate
  55. +3 −0 episode-163/friends/script/performance/benchmarker
  56. +3 −0 episode-163/friends/script/performance/profiler
  57. +3 −0 episode-163/friends/script/plugin
  58. +3 −0 episode-163/friends/script/runner
  59. +3 −0 episode-163/friends/script/server
  60. 0 episode-163/friends/templates
  61. +7 −0 episode-163/friends/test/fixtures/friendships.yml
  62. +12 −0 episode-163/friends/test/fixtures/users.yml
  63. +22 −0 episode-163/friends/test/functional/friendships_controller_test.rb
  64. +22 −0 episode-163/friends/test/functional/sessions_controller_test.rb
  65. +21 −0 episode-163/friends/test/functional/users_controller_test.rb
  66. +9 −0 episode-163/friends/test/performance/browsing_test.rb
  67. +38 −0 episode-163/friends/test/test_helper.rb
  68. +7 −0 episode-163/friends/test/unit/friendship_test.rb
  69. +86 −0 episode-163/friends/test/unit/user_test.rb
View
@@ -0,0 +1,8 @@
+Railscasts Episode #163: Self Referential Association
+
+http://railscasts.com/episodes/163
+
+Commands
+
+ script/generate nifty_scaffold friendship user_id:integer friend_id:integer create destroy
+ rake db:migrate
@@ -0,0 +1,3 @@
+tmp/*
+log/*
+*.sqlite3
@@ -0,0 +1,243 @@
+== Welcome to Rails
+
+Rails is a web-application framework that includes everything needed to create
+database-backed web applications according to the Model-View-Control pattern.
+
+This pattern splits the view (also called the presentation) into "dumb" templates
+that are primarily responsible for inserting pre-built data in between HTML tags.
+The model contains the "smart" domain objects (such as Account, Product, Person,
+Post) that holds all the business logic and knows how to persist themselves to
+a database. The controller handles the incoming requests (such as Save New Account,
+Update Product, Show Post) by manipulating the model and directing data to the view.
+
+In Rails, the model is handled by what's called an object-relational mapping
+layer entitled Active Record. This layer allows you to present the data from
+database rows as objects and embellish these data objects with business logic
+methods. You can read more about Active Record in
+link:files/vendor/rails/activerecord/README.html.
+
+The controller and view are handled by the Action Pack, which handles both
+layers by its two parts: Action View and Action Controller. These two layers
+are bundled in a single package due to their heavy interdependence. This is
+unlike the relationship between the Active Record and Action Pack that is much
+more separate. Each of these packages can be used independently outside of
+Rails. You can read more about Action Pack in
+link:files/vendor/rails/actionpack/README.html.
+
+
+== Getting Started
+
+1. At the command prompt, start a new Rails application using the <tt>rails</tt> command
+ and your application name. Ex: rails myapp
+2. Change directory into myapp and start the web server: <tt>script/server</tt> (run with --help for options)
+3. Go to http://localhost:3000/ and get "Welcome aboard: You're riding the Rails!"
+4. Follow the guidelines to start developing your application
+
+
+== Web Servers
+
+By default, Rails will try to use Mongrel if it's are installed when started with script/server, otherwise Rails will use WEBrick, the webserver that ships with Ruby. But you can also use Rails
+with a variety of other web servers.
+
+Mongrel is a Ruby-based webserver with a C component (which requires compilation) that is
+suitable for development and deployment of Rails applications. If you have Ruby Gems installed,
+getting up and running with mongrel is as easy as: <tt>gem install mongrel</tt>.
+More info at: http://mongrel.rubyforge.org
+
+Say other Ruby web servers like Thin and Ebb or regular web servers like Apache or LiteSpeed or
+Lighttpd or IIS. The Ruby web servers are run through Rack and the latter can either be setup to use
+FCGI or proxy to a pack of Mongrels/Thin/Ebb servers.
+
+== Apache .htaccess example for FCGI/CGI
+
+# General Apache options
+AddHandler fastcgi-script .fcgi
+AddHandler cgi-script .cgi
+Options +FollowSymLinks +ExecCGI
+
+# If you don't want Rails to look in certain directories,
+# use the following rewrite rules so that Apache won't rewrite certain requests
+#
+# Example:
+# RewriteCond %{REQUEST_URI} ^/notrails.*
+# RewriteRule .* - [L]
+
+# Redirect all requests not available on the filesystem to Rails
+# By default the cgi dispatcher is used which is very slow
+#
+# For better performance replace the dispatcher with the fastcgi one
+#
+# Example:
+# RewriteRule ^(.*)$ dispatch.fcgi [QSA,L]
+RewriteEngine On
+
+# If your Rails application is accessed via an Alias directive,
+# then you MUST also set the RewriteBase in this htaccess file.
+#
+# Example:
+# Alias /myrailsapp /path/to/myrailsapp/public
+# RewriteBase /myrailsapp
+
+RewriteRule ^$ index.html [QSA]
+RewriteRule ^([^.]+)$ $1.html [QSA]
+RewriteCond %{REQUEST_FILENAME} !-f
+RewriteRule ^(.*)$ dispatch.cgi [QSA,L]
+
+# In case Rails experiences terminal errors
+# Instead of displaying this message you can supply a file here which will be rendered instead
+#
+# Example:
+# ErrorDocument 500 /500.html
+
+ErrorDocument 500 "<h2>Application error</h2>Rails application failed to start properly"
+
+
+== Debugging Rails
+
+Sometimes your application goes wrong. Fortunately there are a lot of tools that
+will help you debug it and get it back on the rails.
+
+First area to check is the application log files. Have "tail -f" commands running
+on the server.log and development.log. Rails will automatically display debugging
+and runtime information to these files. Debugging info will also be shown in the
+browser on requests from 127.0.0.1.
+
+You can also log your own messages directly into the log file from your code using
+the Ruby logger class from inside your controllers. Example:
+
+ class WeblogController < ActionController::Base
+ def destroy
+ @weblog = Weblog.find(params[:id])
+ @weblog.destroy
+ logger.info("#{Time.now} Destroyed Weblog ID ##{@weblog.id}!")
+ end
+ end
+
+The result will be a message in your log file along the lines of:
+
+ Mon Oct 08 14:22:29 +1000 2007 Destroyed Weblog ID #1
+
+More information on how to use the logger is at http://www.ruby-doc.org/core/
+
+Also, Ruby documentation can be found at http://www.ruby-lang.org/ including:
+
+* The Learning Ruby (Pickaxe) Book: http://www.ruby-doc.org/docs/ProgrammingRuby/
+* Learn to Program: http://pine.fm/LearnToProgram/ (a beginners guide)
+
+These two online (and free) books will bring you up to speed on the Ruby language
+and also on programming in general.
+
+
+== Debugger
+
+Debugger support is available through the debugger command when you start your Mongrel or
+Webrick server with --debugger. This means that you can break out of execution at any point
+in the code, investigate and change the model, AND then resume execution!
+You need to install ruby-debug to run the server in debugging mode. With gems, use 'gem install ruby-debug'
+Example:
+
+ class WeblogController < ActionController::Base
+ def index
+ @posts = Post.find(:all)
+ debugger
+ end
+ end
+
+So the controller will accept the action, run the first line, then present you
+with a IRB prompt in the server window. Here you can do things like:
+
+ >> @posts.inspect
+ => "[#<Post:0x14a6be8 @attributes={\"title\"=>nil, \"body\"=>nil, \"id\"=>\"1\"}>,
+ #<Post:0x14a6620 @attributes={\"title\"=>\"Rails you know!\", \"body\"=>\"Only ten..\", \"id\"=>\"2\"}>]"
+ >> @posts.first.title = "hello from a debugger"
+ => "hello from a debugger"
+
+...and even better is that you can examine how your runtime objects actually work:
+
+ >> f = @posts.first
+ => #<Post:0x13630c4 @attributes={"title"=>nil, "body"=>nil, "id"=>"1"}>
+ >> f.
+ Display all 152 possibilities? (y or n)
+
+Finally, when you're ready to resume execution, you enter "cont"
+
+
+== Console
+
+You can interact with the domain model by starting the console through <tt>script/console</tt>.
+Here you'll have all parts of the application configured, just like it is when the
+application is running. You can inspect domain models, change values, and save to the
+database. Starting the script without arguments will launch it in the development environment.
+Passing an argument will specify a different environment, like <tt>script/console production</tt>.
+
+To reload your controllers and models after launching the console run <tt>reload!</tt>
+
+== dbconsole
+
+You can go to the command line of your database directly through <tt>script/dbconsole</tt>.
+You would be connected to the database with the credentials defined in database.yml.
+Starting the script without arguments will connect you to the development database. Passing an
+argument will connect you to a different database, like <tt>script/dbconsole production</tt>.
+Currently works for mysql, postgresql and sqlite.
+
+== Description of Contents
+
+app
+ Holds all the code that's specific to this particular application.
+
+app/controllers
+ Holds controllers that should be named like weblogs_controller.rb for
+ automated URL mapping. All controllers should descend from ApplicationController
+ which itself descends from ActionController::Base.
+
+app/models
+ Holds models that should be named like post.rb.
+ Most models will descend from ActiveRecord::Base.
+
+app/views
+ Holds the template files for the view that should be named like
+ weblogs/index.html.erb for the WeblogsController#index action. All views use eRuby
+ syntax.
+
+app/views/layouts
+ Holds the template files for layouts to be used with views. This models the common
+ header/footer method of wrapping views. In your views, define a layout using the
+ <tt>layout :default</tt> and create a file named default.html.erb. Inside default.html.erb,
+ call <% yield %> to render the view using this layout.
+
+app/helpers
+ Holds view helpers that should be named like weblogs_helper.rb. These are generated
+ for you automatically when using script/generate for controllers. Helpers can be used to
+ wrap functionality for your views into methods.
+
+config
+ Configuration files for the Rails environment, the routing map, the database, and other dependencies.
+
+db
+ Contains the database schema in schema.rb. db/migrate contains all
+ the sequence of Migrations for your schema.
+
+doc
+ This directory is where your application documentation will be stored when generated
+ using <tt>rake doc:app</tt>
+
+lib
+ Application specific libraries. Basically, any kind of custom code that doesn't
+ belong under controllers, models, or helpers. This directory is in the load path.
+
+public
+ The directory available for the web server. Contains subdirectories for images, stylesheets,
+ and javascripts. Also contains the dispatchers and the default HTML files. This should be
+ set as the DOCUMENT_ROOT of your web server.
+
+script
+ Helper scripts for automation and generation.
+
+test
+ Unit and functional tests along with fixtures. When using the script/generate scripts, template
+ test files will be generated for you and placed in this directory.
+
+vendor
+ External libraries that the application depends on. Also includes the plugins subdirectory.
+ If the app has frozen rails, those gems also go here, under vendor/rails/.
+ This directory is in the load path.
@@ -0,0 +1,10 @@
+# Add your own tasks in files placed in lib/tasks ending in .rake,
+# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
+
+require(File.join(File.dirname(__FILE__), 'config', 'boot'))
+
+require 'rake'
+require 'rake/testtask'
+require 'rake/rdoctask'
+
+require 'tasks/rails'
@@ -0,0 +1,11 @@
+# Filters added to this controller apply to all controllers in the application.
+# Likewise, all the methods added will be available for all controllers.
+
+class ApplicationController < ActionController::Base
+ include Authentication
+ helper :all # include all helpers, all the time
+ protect_from_forgery # See ActionController::RequestForgeryProtection for details
+
+ # Scrub sensitive parameters from your log
+ # filter_parameter_logging :password
+end
@@ -0,0 +1,19 @@
+class FriendshipsController < ApplicationController
+ def create
+ @friendship = current_user.friendships.build(:friend_id => params[:friend_id])
+ if @friendship.save
+ flash[:notice] = "Added friend."
+ redirect_to root_url
+ else
+ flash[:error] = "Unable to add friend."
+ redirect_to root_url
+ end
+ end
+
+ def destroy
+ @friendship = current_user.friendships.find(params[:id])
+ @friendship.destroy
+ flash[:notice] = "Removed friendship."
+ redirect_to current_user
+ end
+end
@@ -0,0 +1,22 @@
+class SessionsController < ApplicationController
+ def new
+ end
+
+ def create
+ user = User.authenticate(params[:login], params[:password])
+ if user
+ session[:user_id] = user.id
+ flash[:notice] = "Logged in successfully."
+ redirect_to root_url
+ else
+ flash.now[:error] = "Invalid login or password."
+ render :action => 'new'
+ end
+ end
+
+ def destroy
+ session[:user_id] = nil
+ flash[:notice] = "You have been logged out."
+ redirect_to root_url
+ end
+end
@@ -0,0 +1,24 @@
+class UsersController < ApplicationController
+ def index
+ @users = User.all
+ end
+
+ def show
+ @user = current_user
+ end
+
+ def new
+ @user = User.new
+ end
+
+ def create
+ @user = User.new(params[:user])
+ if @user.save
+ session[:user_id] = @user.id
+ flash[:notice] = "Thank you for signing up! You are now logged in."
+ redirect_to root_url
+ else
+ render :action => 'new'
+ end
+ end
+end
@@ -0,0 +1,3 @@
+# Methods added to this helper will be available to all templates in the application.
+module ApplicationHelper
+end
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+module FriendshipsHelper
+end
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+# These helper methods can be called in your template to set variables to be used in the layout
+# This module should be included in all views globally,
+# to do so you may need to add this line to your ApplicationController
+# helper :layout
+module LayoutHelper
+ def title(page_title, show_title = true)
+ @content_for_title = page_title.to_s
+ @show_title = show_title
+ end
+
+ def show_title?
+ @show_title
+ end
+
+ def stylesheet(*args)
+ content_for(:head) { stylesheet_link_tag(*args.map(&:to_s)) }
+ end
+
+ def javascript(*args)
+ args = args.map { |arg| arg == :defaults ? arg : arg.to_s }
+ content_for(:head) { javascript_include_tag(*args) }
+ end
+end
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+module SessionsHelper
+end
@@ -0,0 +1,2 @@
+module UsersHelper
+end
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+class Friendship < ActiveRecord::Base
+ belongs_to :user
+ belongs_to :friend, :class_name => "User"
+end
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