Default $resource service does not have a PUT/update method on the class. This might be because it does not expect to need to PUT without first doing a GET (it appears to be intended for 100% RESTful use), although I'm not sure if the returned instance has PUT or not. If that isn't true, then maybe they just figured POST could do both new/create…

AngularJS $resource class PUT

/*
 * Create a $resource with a PUT (without a GET first)
 */
angular.module('whateverService', ['ngResource'])
    .factory('Whatever', function($resource) {
		return $resource(getApiDomain() + '/api/whatever/', {}, {
			'update': {
				method: 'PUT',
				isArray: false
			}
		});
	});

/*
 * Usage, i.e., in a controller
 */
Login.update(registerInput,
	function success(response) {
		log('success response: ' + angular.toJson(response));
		$scope.registerResult = response;
	}, function error(response) {
		// TODO: Can we get others? status, headers, config
		$scope.logAjaxError(response);
	});