backbone validation

demo.coffee

App.Models.Test = Backbone.Model.extend(
	urlRoot: '/api/test'

	validate: (attrs) ->
		errors = []
		if attrs.to is ''
			errors.push
				name: "to"
				field: "js-to"
				message: "You must enter a to address"
		if attrs.subject is ''
			errors.push
				name: "subject"
				field: "js-subject"
				message: "You must enter a subject"

		# Return our errors array if it isn't empty
		errors  if errors.length > 0
)

App.Views.Details = Backbone.View.extend(
	initialize: ->
		@model.bind "error", @error, this

	events:
		"click #js-save": "saveItem"

	saveItem: (e) ->
		e.preventDefault()

		# Set the model then save it.
		@model.set
			subject: $("#js-subject").val()
			message: $("#js-message").val()
			mailbox_id: $("#js-from").val()
			to: $("#js-to").val()
			cc: $("#js-cc").val()
			bcc: $("#js-bcc").val()
			tags: App.Helpers.tagsToObject $('#js-tags').val()
			scope: $('#js-scope').val()
			attachments: attachments

		@model.save null,
			success: (model, response) =>
				App.Helpers.showAlert "Success!", "Saved Successfully", "alert-success"
				@next()
			error: (model, response) ->
				App.Helpers.showAlert "Error", "An error occurred while trying to save this item", "alert-error"

	# Show the errors based on validation failure.
	error: (model, error) ->
		App.Helpers.displayValidationErrors error
)