Question

最近我弄乱了我的mongodb服务器，但我修复了它，除了这个目录外，一切都很顺利。当我npm安装mongoose回到这个目录，它的工作和一切，但假设弹出的node_modolus文件夹不是

door_bells:~/workspace/Associations.1 $ npm install mongoose
mongoose@4.5.10 ../../node_modules/mongoose
├── sliced@1.0.1
├── ms@0.7.1
├── hooks-fixed@1.2.0
├── regexp-clone@0.0.1
├── async@1.5.2
├── muri@1.1.0
├── mpromise@0.5.5
├── kareem@1.1.3
├── mpath@0.2.1
├── bson@0.4.23
├── mquery@1.11.0 (debug@2.2.0, sliced@0.0.5, bluebird@2.10.2)
└── mongodb@2.1.18 (es6-promise@3.0.2, readable-stream@1.0.31, mongodb-core@1.3.18)

当我尝试在这个目录中运行一个js文件时，这是我得到的错误：

door_bells:~/workspace/Associations $ node embed.js
events.js:141
      throw er; // Unhandled 'error' event
      ^

TypeError: Cannot read property 'posts' of null
    at /home/ubuntu/workspace/Associations/embed.js:56:12
    at Query.<anonymous> (/home/ubuntu/node_modules/mongoose/lib/model.js:3327:16)
    at /home/ubuntu/node_modules/mongoose/node_modules/kareem/index.js:259:21
    at /home/ubuntu/node_modules/mongoose/node_modules/kareem/index.js:127:16
    at nextTickCallbackWith0Args (node.js:420:9)
    at process._tickCallback (node.js:349:13)

var userSchema = new mongoose.Schema({
    email: String,
    name: String,
    posts: [postSchema] 
});
var User = mongoose.model('User', userSchema);

User.findOne({name: 'sl'}, function(err,user){ 
   if(err) {
       console.log(err); 
   } else { 
       user.posts.push({ 
           title: '3 Things i really hate',
           content: 'uuK,SyY,x'
       });
       user.save(function(err,user){ //user save
           if(err){
               console.log(err);
           } else {
               console.log(user);
           }
       });
   } 
});

Answer 1

如果你有一两个问题，你的问题有点不清楚。对于＆＃39;帖子＆＃39;问题可能是因为您没有找到匹配的用户。你应该检查一下：

User.findOne({name: 'sl'}, function(err,user){ 
 if(err) {
   console.log(err); 
 } else { 
   // There is no reason to assume 'user' exists here. Checking for errors would not show this.
   user.posts.push({

因此...

if(user) {
   user.posts.push({

关于node_modules的问题。如果你确实有问题，那就不完全清楚了。有些事情确实搞砸了，在这种情况下，我会删除整个node_modules文件夹并重新创建它。

rm -rf node_modules // be sure to be in you project directory - or delete by hand if you prefer
npm i  // Reinstall it all

NPM安装mongoose？

1 个答案: