Update to lenfire's more recent derby and work around ref issue.

labs/architecture-examples/derby/package.json

@@ -4,7 +4,7 @@
 	"version": "0.1.0",
 	"main": "server.js",
 	"dependencies": {
-		"derby": "~0.3.13",
+		"derby": "git://github.com/lefnire/derby#6bf758a587",
 		"express": "~3.0.1",
 		"gzippo": "~0.2.0"
 	},

labs/architecture-examples/derby/src/todos/index.coffee

@@ -30,21 +30,25 @@ get '/:groupName', (page, model, {groupName}) ->
 			.where('group').equals(groupName)
 			.where('completed').notEquals(true)
 
-		model.set '_filter', 'all'
-		model.ref '_list.shown', '_list', '_filter'
+		#model.set '_filter', 'all'
+		# model.ref '_list.shown', '_list', '_filter'
+		# Since a recent commit, the above will result in
+		# model.get('_list.shown') returning:
+		# function getter(data, pathToRef, rest, refEmitter, prevRests) {..}
+		model.ref '_list.shown', '_list.all'
 
 		page.render()
 
 # Transitional route for enabling a filter
 get from: '/:groupName', to: '/:groupName/:filterName',
 	forward: (model, {filterName}) ->
-		model.set '_filter', filterName
+		model.ref '_list.shown', "_list.#{filterName}"
 	back: (model, params) ->
-		model.set '_filter', 'all'
+		model.ref '_list.shown', "_list.all"
 
 get from: '/:groupName/:filterName', to: '/:groupName/:filterName',
 	forward: (model, {filterName}) ->
-		model.set '_filter', filterName
+		model.ref '_list.shown', "_list.#{filterName}"
 
 ready (model) ->
 	todos = model.at 'todos'