无法读取空节点的属性 'name'

Question

架构

var campgroundSchema = new mongoose.Schema({
     name: String,
     image: String,
     description: String,
     _id: String
});

var Campground = mongoose.model("Campground", campgroundSchema);

app.get("/campgrounds/:id",function(req , res){
    Campground.findById(req.params._id, function(err, foundCampgrounds){
        if(err){
            console.log(err);
        }else{
            res.render("show", {campground: foundCampgrounds});
        }
    });
});

show.ejs

<%- include('partials/header')  %> 
<h1>this is a show template</h1>
<p><%= campground.name %></p>
<img src="<%=campground.image%>">

<%- include('partials/footer')  %>

错误

TypeError: /home/ec2-user/environment/Yelpcamp/v2/views/show.ejs:3`
    1| <%- include('partials/header')  %> `
    2| <h1>this is a show template</h1>`
 >> 3| <p><%= campground.name %></p>`
    4| <img src="<%=campground.image%>">`
    5| 
    6| <%- include('partials/footer')  %>`

Cannot read property 'name' of null at eval (/home/ec2-user/environment/Yelpcamp/v2/views/show.ejs:13:37) at show (/home/ec2-user/environment/Yelpcamp/v2/node_modules/ejs/lib/ejs.js:656:17) at tryHandleCache (/home/ec2-user/environment/Yelpcamp/v2/node_modules/ejs/lib/ejs.js:254:36) at View.exports.renderFile [as engine] (/home/ec2-user/environment/Yelpcamp/v2/node_modules/ejs/lib/ejs.js:459:10) at View.render (/home/ec2-user/environment/Yelpcamp/v2/node_modules/express/lib/view.js:135:8) at tryRender (/home/ec2-user/environment/Yelpcamp/v2/node_modules/express/lib/application.js:640:10) at Function.render (/home/ec2-user/environment/Yelpcamp/v2/node_modules/express/lib/application.js:592:3) at ServerResponse.render (/home/ec2-user/environment/Yelpcamp/v2/node_modules/express/lib/response.js:1012:7) at /home/ec2-user/environment/Yelpcamp/v2/app.js:74:17 at /home/ec2-user/environment/Yelpcamp/v2/node_modules/mongoose/lib/model.js:4828:16 at /home/ec2-user/environment/Yelpcamp/v2/node_modules/mongoose/lib/query.js:4390:12 at model.Query.Query._completeOne (/home/ec2-user/environment/Yelpcamp/v2/node_modules/mongoose/lib/query.js:2074:12) at Immediate.Query.base.findOne.call (/home/ec2-user/environment/Yelpcamp/v2/node_modules/mongoose/lib/query.js:2136:10) at Immediate. (/home/ec2-user/environment/Yelpcamp/v2/node_modules/mquery/lib/utils.js:116:16) at runCallback (timers.js:705:18) at tryOnImmediate (timers.js:676:5)

即使在重新启动后我仍收到此错误 mongodb 以及如何检查名称是否为空

Answer 1

解决方法是：

重启服务器后，打开“/campgrounds”页面，我这里是“http://localhost:3000/campgrounds”
然后点击更多信息。

我也遇到了同样的问题，但是当我从/campgrounds页面打开时就解决了

Answer 2

bruh 必须 req.params.id 没有下划线 :)

Answer 3

问题的解决有点简单，就在这行代码中

res.redirect("/campgrounds"{campground:newCampgrounds})

您可能没有将 newCampgrounds 引用到将在 show.ejs 中使用的露营地，如 campground.name 或 campground.image 等等..

无法读取空节点的属性 'name'

Cannot read property 'name' of null node

javascript

ejs

node.js

express

aws-cloud9

无法读取空节点的 属性 'name'

Cannot read property 'name' of null node

javascript

ejs

node.js

express

aws-cloud9

无法读取空节点的属性 'name'