| Module | CouchRest::Mixins::ClassProxy::ClassMethods | 
| In: | lib/couchrest/mixins/class_proxy.rb | 
Return a proxy object which represents a model class on a chosen database instance. This allows you to DRY operations where a database is chosen dynamically.
  db = CouchRest::Database.new(...)
  articles = Article.on(db)
  articles.all { ... }
  articles.by_title { ... }
  u = articles.get("someid")
  u = articles.new(:title => "I like plankton")
  u.save    # saved on the correct database