Mongo，深度填充Node.js

Question

我面臨着一個人口稠密的問題，

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 }
});

目標是填充“社交”文檔並獲取具有匹配ID的注釋。 解決方案是將socialId的“ ref”設置為“ user.comments”，而不僅僅是user。 這樣，它總是返回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

據我所知，您可能需要再次填充它們，我認為僅憑一個查詢就不可能進行大量填充。

   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

這個mongoose-deep-populate有一個mongoose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
        }
    }
});

你可以在這里了解更多