Promote ValidationBag error handling to Application wide level

src/Application.ts

@@ -1,4 +1,4 @@
-import express, {NextFunction, Request, RequestHandler, Response, Router} from 'express';
+import express, {NextFunction, Request, Response, Router} from 'express';
 import {BadRequestError, HttpError, NotFoundHttpError, ServerError, ServiceUnavailableHttpError} from "./HttpError";
 import {lib} from "nunjucks";
 import Logger from "./Logger";
@@ -9,6 +9,7 @@ import MysqlConnectionManager from "./db/MysqlConnectionManager";
 import Migration from "./db/Migration";
 import {Type} from "./Utils";
 import LogRequestsComponent from "./components/LogRequestsComponent";
+import {ValidationBag} from "./db/Validator";
 import TemplateError = lib.TemplateError;
 
 export default abstract class Application {
@@ -69,6 +70,12 @@ export default abstract class Application {
                 return next(err);
             }
 
+            if (err instanceof ValidationBag) {
+                req.flash('validation', err.getMessages());
+                res.redirectBack();
+                return;
+            }
+
             let errorID: string = LogRequestsComponent.logRequest(req, res, err, '500 Internal Error', err instanceof BadRequestError || err instanceof ServiceUnavailableHttpError);
 
             let httpError: HttpError;

src/Controller.ts

@@ -98,24 +98,15 @@ export default abstract class Controller {
 
     private wrap(handler: RequestHandler): RequestHandler {
         return (req, res, next) => {
-            function handleErr(e: any) {
-                if (e instanceof ValidationBag) {
-                    req.flash('validation', e.getMessages());
-                    res.redirectBack();
-                } else {
-                    next(e);
-                }
-            }
-
             try {
                 const promise = handler.call(this, req, res, next);
                 if (promise instanceof Promise) {
                     promise.catch(e => {
-                        handleErr(e);
+                        next(e);
                     });
                 }
             } catch (e) {
-                handleErr(e);
+                next(e);
             }
         };
     }