猫鼬js中的查找方法不适用于填充

Question

现在，我正在从事社交媒体项目，用户可以轻松地对帖子发表评论并发表评论。但是，当我发送查找与用户评论相关的帖子的请求时，并不会相应填充该信息。

帖子模型

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const postSchema = new Schema({
  text: {
    type: String,
    required: [true, 'Name is required']
  },
  photo: {
    data: Buffer,
    contentType: String
  },
  likes: [{ type: mongoose.Schema.ObjectId, ref: 'User' }],
  comments: [
    {
      text: String,
      created: { type: Date, default: Date.now },
      postedBy: { type: mongoose.Schema.ObjectId, ref: 'User' }
    }
  ],
  postedBy: { type: mongoose.Schema.ObjectId, ref: 'User' },
  created: {
    type: Date,
    default: Date.now
  }
});

const Post = mongoose.model('Post', postSchema);

module.exports = Post;

这是此请求的相应控制器

exports.listPostByUser = (req, res, next) => {
  Post.find({ postedBy: req.profile._id })
    .populate('comments', 'text created')
    .populate('comments.postedBy', '_id name')
    .populate('postedBy', '_id name')
    .exec((err, posts) => {
      if (err) {
        return res.status(400).json({
          error: 'errorHandler.getErrorMessage(err)'
        });
      }
      res.json(posts);
    });
};

当我登录 req.profile._id 时，它会正确找到userId，但不会填充注释。