todomvc/examples/knockback/src/models/todo_collection.coffee

> Helping you select an MV\* framework

class window.TodoCollection extends Backbone.Collection
	localStorage: new Store('todos-knockback') # Save all of the todos under the "todos-knockback" namespace.
	model: Todo

	completedCount: -> @models.reduce(((prev,cur)-> return prev + if cur.completed() then 1 else 0), 0)
	remainingCount: -> @models.length - @completedCount()

	completeAll: (completed) -> @each((todo) -> todo.completed(completed))

	destroyCompleted: ->
		completed_tasks = @filter((todo) -> return todo.completed())
		model.destroy() for model in completed_tasks
		return