added an example codecast

examples/model/example.rb

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+require 'rubygems'
+require 'couchrest'
+
+def show obj
+  puts obj.inspect
+  puts
+end
+
+CouchRest::Model.default_database = CouchRest.database!('couchrest-model-example')
+
+class Author < CouchRest::Model
+  key_accessor :name
+  def drink_scotch
+    puts "... glug type glug ... I'm #{name} ... type glug glug ..."
+  end
+end
+
+class Post < CouchRest::Model
+  key_accessor :title, :body, :author
+
+  cast :author, :as => 'Author'
+
+  timestamps!
+end
+
+class Comment < CouchRest::Model
+  cast :commenter, :as => 'Author'
+
+  def post= post
+    self["post_id"] = post.id
+  end
+  def post
+    Post.get(self['post_id']) if self['post_id']
+  end
+  
+  timestamps!
+end
+
+puts "Act I: CRUD"
+puts
+puts "(pause for dramatic effect)"
+puts
+sleep 2
+
+puts "Create an author."
+quentin = Author.new("name" => "Quentin Hazel")
+show quentin
+
+puts "Create a new post."
+post = Post.new(:title => "First Post", :body => "Lorem ipsum dolor sit amet, consectetur adipisicing elit...")
+show post
+
+puts "Add the author to the post."
+post.author = quentin
+show post
+
+puts "Save the post."
+post.save
+show post
+
+puts "Load the post."
+reloaded = Post.get(post.id)
+show reloaded
+
+puts "The author of the post is an instance of Author."
+reloaded.author.drink_scotch
+
+puts "\nAdd some comments to the post."
+comment_one = Comment.new :text => "Blah blah blah", :commenter => {:name => "Joe Sixpack"}
+comment_two = Comment.new :text => "Yeah yeah yeah", :commenter => {:name => "Jane Doe"}
+comment_three = Comment.new :text => "Whatever...", :commenter => {:name => "John Stewart"}
+
+# TODO - maybe add some magic here?
+comment_one.post = post
+comment_two.post = post
+comment_three.post = post
+comment_one.save
+comment_two.save
+comment_three.save
+
+show comment_one
+show comment_two
+show comment_three
+
+puts "We can load a post through its comment (no magic here)."
+show post = comment_one.post
+
+puts "Commenters are also authors."
+comment_two['commenter'].drink_scotch
+comment_one['commenter'].drink_scotch
+comment_three['commenter'].drink_scotch
+
+puts "\nLet's save an author to her own document."
+jane = comment_two['commenter']
+jane.save
+show jane
+
+puts "Oh, that's neat! Because Ruby passes hash valuee by reference, Jane's new id has been added to the comment she left."
+show comment_two
+
+puts "Of course, we'd better remember to save it."
+comment_two.save
+show comment_two
+
+puts "Oooh, denormalized... feel the burn!"
+puts
+puts
+puts
+puts "Act II: Views"
+puts
+puts
+sleep 2
+
+puts "Let's find all the comments that go with our post."
+puts "Our post has id #{post.id}, so lets find all the comments with that post_id."
+puts
+
+class Comment
+  view_by :post_id
+end
+
+comments = Comment.by_post_id :key => post.id
+show comments
+
+puts "That was too easy."
+puts "We can even wrap it up in a finder on the Post class."
+puts
+
+class Post
+  def comments
+    Comment.by_post_id :key => id
+  end
+end
+
+show post.comments
+puts "Gimme 5 minutes and I'll roll this into the framework. ;)"
+puts
+puts "There is a lot more that can be done with views, but a lot of the interesting stuff is joins, which of course range across types. We'll pick up where we left off, next time."