Implement #get! and #find! class methods

Signed-off-by: Marcos Tapajós <tapajos@gmail.com>

lib/couchrest/model/class_proxy.rb

@@ -87,7 +87,14 @@ module CouchRest
           doc
         end
         alias :find :get
-        
+
+        def get!(id)
+          doc = @klass.get!(id, @database)
+          doc.database = @database if doc && doc.respond_to?(:database)
+          doc
+        end
+        alias :find! :get!
+
         # Views
         
         def has_view?(view)

lib/couchrest/model/document_queries.rb

@@ -86,9 +86,12 @@ module CouchRest
         # id<String, Integer>:: Document ID
         # db<Database>:: optional option to pass a custom database to use
         def get!(id, db = database)
-          raise "Missing or empty document ID" if id.to_s.empty?
+          raise CouchRest::Model::DocumentNotFound if id.blank?
+
           doc = db.get id
           build_from_database(doc)
+        rescue RestClient::ResourceNotFound
+          raise CouchRest::Model::DocumentNotFound
         end
         alias :find! :get!
         

lib/couchrest/model/errors.rb

@@ -19,5 +19,7 @@ module CouchRest
         end
       end
     end
+
+    class DocumentNotFound < Errors::CouchRestModelError; end
   end
 end