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        Node.js:文档返回未定义 - Mongoose

        时间:2024-04-19
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                  本文介绍了Node.js:文档返回未定义 - Mongoose的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  Phone.find {number : "12345678"}, (err,phone) ->
                              phone.forEach (item, i) ->
                                  console.log item
                                  console.log item.subdomain
                                  console.log item.subdomain_id
                                  console.log item.city
                  

                  returns:

                  { _id: 4e9b614e01c642c2be000002,
                    city: 'San Francisco',
                    country: 'US',
                    indicative: '234',
                    number: '12345678',
                    subdomain_id: 4e9b532b01c642bf4a000003 }
                  
                  undefined
                  undefined
                  San Francisco
                  

                  Why is the item.subdomain_id returning undefined if it's in the document?

                  Edit:

                  I added subdomain_id to the Schema and it now works (item.subdomain_id), however, I'm not getting the subdomain document, only the ID. I want to get item.subdomain and be able to call methods on it.

                  Thanks

                  解决方案

                  So I was just searching for an answer to the same question. What I was doing was using Mongoose's find (through object inheritance), in order to use a json find query.

                  What it looked like was this:

                  User.find({email:req.body.email}).exec(function(err,user){
                    console.log(user.email);
                  }
                  

                  What I forgot about and hadn't considered is that the return object will be an Array. This is because your find query can easily and often does include multiple objects. Because of this, you will either need to enumerate your results, or if your query is only expected to findOne (and we didn't use findOne), you can simply call object 0 like so:

                  User.find({email:req.body.email}).exec(function(err,user){
                    console.log(user[0].email);
                  }
                  

                  I hope this helps, let us know if you are still having trouble.

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