为什么返回此YelpCamp代码“ TypeError：无法读取未定义的属性（Reading＆＃x27; push;）;

Question

我只是WebDev的一名学生，我已经尝试对其进行纠正，但我很感激如果这里被征用的成员可以帮助我纠正此错误，则该代码假设将评论推向可用的每个营地阵列。 评论注释。

var mongoose = require("mongoose");
var Campground = require("./models/campground");
var Comment   = require("./models/comment");
var data = [
   {
      name: "Cloud's Rest", 
      image: "https://farm4.staticflickr.com/3795/10131087094_c1c0a1c859.jpg",
      description: "blah blah blah"
},
  {
     name: "Desert Mesa", 
    image: "https://images.unsplash.com/photo-1557214997-7eae7e0e7aaa?ixlib=rb-1.2.1&  ixid=MnwxMjA3fDB8MHxzZWFyY2h8Mnx8ZGVzZXJ0JTIwbWVzYXxlbnwwfHwwfHw%3D&auto=format&fit=crop&w=400&q=60",
    description: "blah blah blah"
},
{
    name: "Canyon Floor", 
    image: "https://farm1.staticflickr.com/189/493046463_841a18169e.jpg",
    description: "blah blah blah"
}
]
function seedDB(){
 //Remove all campgrounds
    Campground.remove({}, function(err){
        if(err){
        console.log(err);
        }
    console.log("removed campgrounds!");
     //add a few campgrounds
    data.forEach(function(seed){
        Campground.create(seed, function(err, campground){
            if(err){
                console.log(err)
            } else {
                console.log("added a campground");
               // create a comment
                Comment.create(
                    {
                        text: "This place is great, but facilities are not good",
                        author: "John Paul"
                     }, function(err, comment){
                          if(err){
                              console.log(err);
                          } else {
                              campground.comments.push(comment);
                              campground.save();
                              console.log("Created new comment");
                          }
                      });   
              }
        });
    });
}); 
   }
module.exports = seedDB;

如果我

@haris：请检查下面的campground.js，我想评论数组定义为

var mongoose = require（“ mongoose”）;

//架构设置 var CampgroundSchema = new Mongoose.schema（{{ 名称：字符串， 图像：字符串， 描述：字符串， 评论： [ { 类型：mongoose.schema.types.objectid， 参考：“评论” } 这是给出的 }）;

Module.exports = Mongoose.model（“营地”，CampgroundSchema）;

Answer 1

您正在尝试推出一个undefined的数组，在此行中出现问题

campground.comments.push(comment);

。它的未定义