Question

我面临着一个人口密集的问题，

var commentSchema = mongoose.Schema({
        name: String });

var userSchema = mongoose.Schema({
    userId: { type: String, default: '' },
    comments: [subSchema]
});

var socialSchema = mongoose.Schema({
    userId: {type: mongoose.Schema.Types.ObjectId, ref: "user"},
    countryCode: { type: String, default: '' },
    socialId: {type: mongoose.Schema.Types.ObjectId, ref: "user"},
    dateAdded: { type: Date, default: Date.now }
});

目标是填充社交＆＃34;记录并获取具有匹配ID的注释。解决方案是设置＆＃34; ref＆＃34; of socialId to＆＃34; user.comments＆＃34;而不仅仅是用户。这样它总是返回null。

 Social.find().populate('socialId').exec(function(err, feed) {
    if (err) {
      console.log(err);
      throw err;
    }else{
      res.json({data: feed, message:"Getting feed"});
    }

  })

Answer 1

据我所知，您可能需要再次填充它们我不认为只有一个查询可以实现深度人口。

   Social.find().populate('socialId').exec(function(err, feed) {
  if (err) {
    console.log(err);
    throw err;
  }else {
    Comments.populate(feed, {path: 'socialId.user.comments'}, function (err, populatedFeeds) {
      if (err) {
        console.log(err);
        throw err;
      } else {
        res.json({data: feed, message: "Getting feed"});
      }
    })
  }
})

Answer 2

这个mongoose-deep-populate

有一个猫鼬插件

var deepPopulate = require('mongoose-deep-populate')(mongoose);
var Schema = new mongoose.Schema({
    ...
});
Schema.plugin(deepPopulate);

// while populating:

Schema.find(...).deepPopulate({
    paths: [], // list of paths goes here
    {
        populate: {
            'first.path': 'things to select' // space seperated list of fields to select
        }
    }
});

您可以阅读有关此here

的更多信息

Mongo，Node.js深入填充

2 个答案: