我在为用户添加评论时遇到问题。一旦我为用户创建评论，它只显示 id，而不显示文本或作者或任何其他属性。很高兴听到任何想法。

这是我的架构和路线:

1) 用户模式:

var mongoose = require("mongoose");

var passportLocalMongoose = require("passport-local-mongoose");



//SCHEMA SETTING UP

var UserSchema = new mongoose.Schema({

  username: String,

  password: String,

  isAdmin: {type: Boolean, default: false},

  firstName: String,

  lastName: String,

  email: String,

  avatar: String,

  yearOfBirth: Number,

  job: String,

  experience: Number,

  city: String,

  country: String,

  description: String,

   reviews: [

       {

        type: mongoose.Schema.Types.ObjectId,

        ref: "Review"

       }

    ]

});



UserSchema.plugin(passportLocalMongoose);



module.exports = mongoose.model("User", UserSchema);

2) 审查模式

var mongoose = require(" Mongoose ");

var reviewSchema = new mongoose.Schema({
    text: String,
    author: {
        id: {
            type: mongoose.Schema.Types.ObjectId,
            ref: "User"
        },
        username: String
    },
    created: {type: Date, default: Date.now}
});

module.exports = mongoose.model("Review", reviewSchema);

3)回顾路线

    var express    = require("express");
var router     = express.Router({mergeParams: true});
var Post       = require("../models/post");
var Comment    = require("../models/comment");
var User       = require("../models/user");
var Review     = require("../models/review");
var middleware = require("../middleware");

//Review New
router.get("/new",  middleware.isLoggedIn, function(req, res){
    // find campground by id
    console.log(req.params.id);
    User.findById(req.params.id).populate("reviews").exec(function (err, user) {
      if(err){
        console.log(err);
      } else {
        res.render("reviews/new", {user: user});
      }
    });
  });

//Review Create
router.post("/", middleware.isLoggedIn,function(req, res){
   //lookup user using ID
   User.findById(req.params.id).populate("reviews").exec(function (err, user) {
       if(err){
           console.log(err);
           res.redirect("/users");
       } else {
        Review.create(req.body.review, function(err, review){
           if(err){
             req.flash("error", "Something went wrong :(");
               console.log(err);
           } else {
               //add username and id to comment
               review.author.id = req.user._id;
               review.author.username = req.user.username;
               //save comment
               review.save();
               user.reviews.push(review);
               user.save();
               console.log(review);
               req.flash("success", "Successfully added review!");
               res.redirect('/users/' + user._id);
           }
        });
       }
   });
});



module.exports = router;

4)显示页面

<% include ../partials/header %>

<div class="card">

  <ul class="list-group list-group-flush">

    <li class="list-group-item heading-user"><%=user.firstName%> <%=user.lastName%></li>

  </ul>

</div>



<div class="row">

  <div class="col-md-4">

    <img class="img-thumbnail" src="<%= user.avatar %>" alt="User Profile Picture">

    <div class="card">

      <ul class="list-group list-group-flush">

        <li class="list-group-item">Profession: <%=user.job%></li>

        <li class="list-group-item">Experience: <%=user.experience%> years</li>

        <li class="list-group-item">Birth Date: <%=user.yearOfBirth%></li>

        <li class="list-group-item">Location: <%=user.country%>, <%=user.city%></li>

        <li class="list-group-item"><%=user.firstName%> has <i class="fas fa-clock"></i> 12 hours on account</li>

      </ul>

      <a href="#" class="btn btn-success">Connect <%=user.firstName%></a>

    </div>

  </div>

  <div class="col-md-8">

    <div class="card">

      <ul class="list-group list-group-flush">

        <li class="list-group-item">

          <p>About <%=user.firstName%>: </p>

          <p><%= user.description %></p>

        </li>

        <li class="list-group-item">Some posts of <%= user.firstName %>:

          <ul>

            <% posts.forEach(function(post){ %>

              <li><a href="/posts/<%= post._id %>"><%= post.title %></a></li>

            <% }); %>

          </ul>

        </li>

      </ul>

    </div>

        <div class="card bg-light comments">

            <div class="card-block">

              <a href="/users/<%=user._id%>/reviews/new" class="btn btn-inline btn-outline-secondary">What do you think about <%=user.firstName%></a>

            </div>



            <hr>

                <% user.reviews.forEach(function(review){ %>

                  <p><%= review %></p>

                <% }); %>

          </div>

        </div>

      </div>



<% include ../partials/footer %>

在这种情况下，review 仅显示为 id，但在 mongo db.reviews.find() 中 --> 一切正常: https://gyazo.com/f1f476b87e554b689a36d07844ecc9b5

如果我在显示页面中放置类似 <%=review.author.username%> 的内容，它会显示错误:

Cannot read property 'username' of undefined at eval (eval at compile (D:\My projects\Backend\timeMe\node_modules\ejs\lib\ejs.js:618:12), :114:40) at Array.forEach () at eval (eval at compile (D:\My projects\Backend\timeMe\node_modules\ejs\lib\ejs.js:618:12), :111:21) at returnedFn (D:\My projects\Backend\timeMe\node_modules\ejs\lib\ejs.js:653:17) at tryHandleCache (D:\My projects\Backend\timeMe\node_modules\ejs\lib\ejs.js:251:36) at View.exports.renderFile [as engine] (D:\My projects\Backend\timeMe\node_modules\ejs\lib\ejs.js:482:10) at View.render (D:\My projects\Backend\timeMe\node_modules\express\lib\view.js:135:8) at tryRender (D:\My projects\Backend\timeMe\node_modules\express\lib\application.js:640:10) at Function.render (D:\My projects\Backend\timeMe\node_modules\express\lib\application.js:592:3) at ServerResponse.render (D:\My projects\Backend\timeMe\node_modules\express\lib\response.js:1008:7)
at D:\My projects\Backend\timeMe\routes\users.js:32:11 at D:\My projects\Backend\timeMe\node_modules\mongoose\lib\model.js:4465:16
at (anonymous function).call (D:\My projects\Backend\timeMe\node_modules\mongoose\lib\query.js:3613:7)
at process.nextTick (D:\My projects\Backend\timeMe\node_modules\mongoose\lib\helpers\query\completeMany.js:35:39) at _combinedTickCallback (internal/process/next_tick.js:131:7) at process._tickCallback (internal/process/next_tick.js:180:9)

感谢您的帮助。真的整天都在这段代码里，看不懂这里出了什么问题

最佳答案

在获取用户的同时需要填充reviews字段来获取reviews的所有数据。

//Review New

router.get("/new",  middleware.isLoggedIn, function(req, res){

    // find campground by id

    console.log(req.params.id);



 User.findById(req.params.id).populate('reviews').exec( function(err, user)

     { 

        if(err){

            console.log(err);

        } else {

             res.render("reviews/new", {user: user});

        }

    })

关于javascript - 不能使用 Node js(express) 和 MongoDB(mongoose) 对用户配置文件进行审核，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51896853/