Adding uniqueness validation support out of the box

lib/couchrest/model/validations.rb

@@ -1,6 +1,11 @@
 # encoding: utf-8
 
 require "couchrest/model/validations/casted_model"
+require "couchrest/model/validations/uniqueness"
+
+I18n.load_path << File.join(
+  File.dirname(__FILE__), "validations", "locale", "en.yml"
+)
 
 module CouchRest
   module Model
@@ -23,8 +28,32 @@ module CouchRest
           validates_with(CastedModelValidator, _merge_attributes(args))
         end
         
-        # TODO: Here will lie validates_uniqueness_of
-        
+        # Validates if the field is unique for this type of document. Automatically creates
+        # a view if one does not already exist and performs a search for all matching
+        # documents.
+        #
+        # Example:
+        #
+        #   class Person < CouchRest::Model::Base
+        #     property :title, String
+        # 
+        #     validates_uniqueness_of :title
+        #   end
+        #
+        # Asside from the standard options, a +:proxy+ parameter is also accepted if you would 
+        # like to call a method on the document on which the view should be performed.
+        #
+        # Examples:
+        #
+        #   # Same as not including proxy:
+        #   validates_uniqueness_of :title, :proxy => 'class'
+        #
+        #   # Person#company.people provides a proxy object for people
+        #   validates_uniqueness_of :title, :proxy => 'company.people'
+        #
+        def validates_uniqueness_of(*args)
+          validates_with(UniquenessValidator, _merge_attributes(args))
+        end
       end
 
     end