问题描述
我有一个从mongodb中检索到的商店对象,我对使用值store.comments感兴趣.
I have a store object i retrieved from mongodb,I am interested in using the value store.comments.
我记录了商店值,它是:
i logged the store value and it is:
store:{ _id: 57e246f73e63d635cce3d174,
__v: 0,
comments: 57e246f73e63d635cce3d177,
loc: [ 105.832321, 105.233272 ],
name: '24 store',
reportedFalse: [],
products: [],
currentRanking:
{ likes: 57e246f73e63d635cce3d175,
dislikes: 57e246f73e63d635cce3d176 },
timePosted: Wed Sep 21 2016 11:38:15 GMT+0300 (Jerusalem Summer Time) },
然后我记录了对象注释值的值- result.comments :
then i logged the value of the object comments value - result.comments:
store comments objectid: undefined
,当我稍后尝试通过注释值搜索时,似乎无法成功搜索它.因为搜索返回null,尽管我看到在数据库中我在"comments"表/模式中有一个具有相同ID的对应对象....
and it seems when i try to search later by the comments value that it doesn't succeed in searching with it. because the search returns null, although i see that in my db i have a corresponding object in "comments" table/schema with the same id....
Comments.findById(commentsId,function(commentsErr,commentsArrObj){
...
cb(null, commentsArrObj._id);
}
我得到:
TypeError: Cannot read property '_id' of null
这是我的架构的一部分以供参考:
heres part of my schema for reference:
name: String,
comments: mongoose.Schema.Types.ObjectId, // each comment has a object id - responder, link curl? crud? to his profile, profile pic, date time.
timePosted : { type: Date, default: Date.now },
currentRanking: {
likes: mongoose.Schema.Types.ObjectId, // a votes document
dislikes: mongoose.Schema.Types.ObjectId // a votes document
},
推荐答案
在您的模式中,您必须使用'ref'
In your schema you have to use 'ref'
comments: mongoose.Schema.Types.ObjectId,ref:'comments'(modal name of comments)
引用注释架构并使用填充注释来获取注释数据.
to refer comments schema and use populate the comments to get comments data.
这篇关于节点js从mongodb obejct内部值返回未定义的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!