Backbone.sync coffeescript

backbone.sync.coffee

_sync = Backbone.sync

methodMap =
	'create': 'POST'
	'update': 'PUT'
	'patch':  'PATCH'
	'delete': 'DELETE'
	'read':   'GET'

Backbone.sync = ->

	type = methodMap[method]

	# Default options unless specified
	_.defaults options or (options = {}),
		emulateHTTP: Backbone.emulateHTTP
		emulateJSON: Backbone.emulateJSON

	params = type: type, dataType: 'json'

	unless options.url then params.url = _.result model, 'url' or urlError()

	if options.data is null and model? and method in ['create', 'update', 'patch']
		params.contentType = 'application/json'
		params.data = JSON.stringify options.attrs or model.toJSON options

	if options.emulateJSON
		params.contentType = 'application/x-www-form-urlencoded'
		params.data = if params.data then model: params.data else {}

	if options.emulateHTTP and type in ['PUT', 'DELETE', 'PATCH']
		params.type = 'POST'
		if options.emulateJSON then params.data._method = type
		
		beforeSend = options.beforeSend
		
		options.beforeSend = (xhr) ->
			xhr.setRequestHeader 'X-HTTP-Method-Override', type
			if beforeSend then return beforeSend.apply this, arguments

	unless params.type is 'GET' and options.emulateJSON then params.processData = false

	error = options.error
	options.error = (xhr, textStatus, errorThrown) ->
		options.textStatus = textStatus
		options.errorThrown = errorThrown
		if error then error.call options.context, xhr, textStatus, errorThrown

	xhr = options.xhr = Backbone.ajax _.extend params, options
	model.trigger 'request', model, xhr, options
	xhr