pass queue errors to next middleware from view

lib/view.js

@@ -16,7 +16,7 @@ var utils = require('keystone-utils');
  * @api public
  */
 
-function View (req, res) {
+function View (req, res, next) {
 
 	if (!req || req.constructor.name !== 'IncomingMessage') {
 		throw new Error('Keystone.View Error: Express request object is required.');
@@ -28,6 +28,7 @@ function View (req, res) {
 
 	this.req = req;
 	this.res = res;
+	this.next = next;
 
 	this.initQueue = [];	// executed first in series
 	this.actionQueue = [];	// executed second in parallel, if optional conditions are met
@@ -367,7 +368,11 @@ View.prototype.render = function (renderFn, locals, callback) {
 			throw new Error('Keystone.View.render() events must be functions.');
 		}
 	}, function (err) {
-		renderFn(err, req, res);
-	});
+		if (err && this.next) {
+			this.next(err);
+		} else {
+			renderFn(err, req, res);
+		}
+	}.bind(this));
 
 };

test/unit/lib/view.js

@@ -83,6 +83,32 @@ describe('Keystone.View', function () {
 				.expect('OK', done);
 		});
 
+		it('must return control to the next middleware on method errors', function(done){
+			var app = getApp();
+			app.get('/', function(req, res, next) {
+				var view = new keystone.View(req, res, next);
+				view.on('init', function(next){
+					var err = new Error('Not Found');
+					err.status = 404;
+					next(err);
+				});
+				view.render(function() {
+					var err = new Error('must not call render');
+					done(err);
+				});
+			});
+			app.use(function(err,req,res,next){
+				if(err && err.status === 404){
+					res.status(404).send('Not Found');
+				} else {
+					done('error should be handled');
+				}
+			});
+			request(app)
+				.get('/')
+				.expect(404, done)
+		});
+
 		function getApp_getAndPost() {
 			var app = getApp();
 			app.all('/', function (req, res) {