Started on the ExtendedDocument class with features moved to mixins.

Properties got added, they define getters, setters and aliases.
They will also be the base of the new validation system.

lib/couchrest/mixins/document_queries.rb

@@ -0,0 +1,42 @@
+module CouchRest
+  module Mixins
+    module DocumentQueries
+      
+      def self.included(base)
+        base.extend(ClassMethods)
+      end
+      
+      module ClassMethods
+        
+        # Load all documents that have the "couchrest-type" field equal to the
+        # name of the current class. Take the standard set of
+        # CouchRest::Database#view options.
+        def all(opts = {}, &block)
+          self.design_doc ||= Design.new(default_design_doc)
+          unless design_doc_fresh
+            refresh_design_doc
+          end
+          view :all, opts, &block
+        end
+
+        # Load the first document that have the "couchrest-type" field equal to
+        # the name of the current class.
+        #
+        # ==== Returns
+        # Object:: The first object instance available
+        # or
+        # Nil:: if no instances available
+        #
+        # ==== Parameters
+        # opts<Hash>::
+        # View options, see <tt>CouchRest::Database#view</tt> options for more info.
+        def first(opts = {})
+          first_instance = self.all(opts.merge!(:limit => 1))
+          first_instance.empty? ? nil : first_instance.first
+        end
+        
+      end
+      
+    end
+  end
+end