Mongo, Node.js deep populate

Question

我正面临着一个深层的问题，

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"文档，并使用匹配ID获取评论。解决方案是将SocialID的" REF"设置为" user.comments"，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，我认为仅在一个查询中就不可能进行大量人口。

   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

此mongoose-deep-populate

有一个蒙古插件

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
        }
    }
});

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