javascript - 为什么我在 UI 中没有收到验证 Flash 消息，我收到这样的 Flash 错误 [object Object],[object Object],[object Object]

Question

我正在开发 NodeJs 应用程序，它是博客应用程序。我使用了快速验证器，我尝试在 UI 端使用快速闪存消息将帖子保存在数据库中之前使用闪存消息验证数据，我成功地将数据保存在数据库中，但在提交表单后消息未出现在 UI 端我收到这样的闪存错误[对象对象],[对象对象],[对象对象]

我正在使用哈巴狗模板引擎。

app.js

const express = require("express");
const path = require("path");
const app = express();
const mongoose = require("mongoose");
const Article = require("./models/article");
const bodyParser = require("body-parser");
const { check, validationResult } = require("express-validator");
const flash = require("connect-flash");
const session = require("express-session");

//Express Session Middleware
app.use(
  session({
    secret: "keyboard cat",
    resave: true,
    saveUninitialized: true
  })
);
app.use(flash());

app.use((req, res, next) => {
  res.locals.errors = req.flash("error");
  res.locals.successes = req.flash("success");
  next();
});
app.get("/articles/add", (req, res) => {
  res.render("add_articles", {
    title: "Add Articles"
  });
});

// Add Submit POST Route
app.post(
  "/articles/add",
  [
    check("title", "Title is required")
      .not()
      .isEmpty(),
    check("author", "Author is required")
      .not()
      .isEmpty(),
    check("body", "Body is required")
      .not()
      .isEmpty()
  ],
  (req, res) => {
    const errors = validationResult(req);

     if (errors) {
      res.render("add_articles", {
        title: "Add Articles",
        errors: errors
      }); 
    } else {
      //GetErrors
      let article = new Article();
      article.title = req.body.title;
      article.author = req.body.author;
      article.body = req.body.body;

      article.save(err => {
        if (err) {
          console.log(err);
          return;
        } else {
          req.flash("success", "Article Added");
          res.redirect("/");
        }
      });
    }
  }
);

消息.pug

.messages
 each type in Object.keys(messages)
    each message in messages[type]
      div(class="alert alert-"+type) #{message}
   

布局.pug

 .container
      if successes
        for success in successes
           div.alert.alert-success #{ success }
      if errors
        for error , i in errors
           div.alert.alert-danger #{ error }

非常感谢任何帮助..

Answer 1

1)我想注意的第一件事是检查是否存在验证错误的方式:

const 错误=validationResult(req);如果(错误){...}

应替换为:

const 错误=validationResult(req); if (errors.isEmpty()) {...}

2) 还有另一个问题，与获取错误数组有关。而不是:

res.render("add_articles", {
title: "添加文章",
错误: 错误
});

您需要使用:

res.render("add_articles", {
title: "添加文章",
错误:errors.array()
});

来源:Express validator docs