mongoose 填充 object id 的数组

Question

我正在尝试通过使用填充来获取嵌套数据（一个大模式有很多属性，其中一个属性就像一个 id 数组到另一个模式）。 我想通过使用 id 找到它来获取嵌套模式。

第一个模式 - 部门：

const mongoose = require("mongoose");

const Schema = mongoose.Schema;

const sectorsSchema = new Schema({
  title: { type: String, required: true },
  description: { type: String, required: true },
  img: { type: String, required: true },
  poc: { type: String, required: true },
  PhoneNum: { type: String, required: true },
  EmailPOC: { type: String, required: true },
  subSectors: [
    { type: mongoose.Types.ObjectId, required: true, ref: "subSectors" },
  ], //store all objectId of Place as an array
  file_gallery: [
    { type: mongoose.Types.ObjectId, required: true, ref: "Files" },
  ], //store all objectId of Place as an array
  web_id: { type: mongoose.Types.ObjectId, required: true, ref: "MainContent" },
});

module.exports = mongoose.model("sectors", sectorsSchema);

文档示例：

和子部门：

const mongoose = require("mongoose");

const Schema = mongoose.Schema;

const subSectorsSchema = new Schema({
  title: { type: String, required: true },
  desc: { type: String, required: true },
  img: { type: String, required: true },
  poc: { type: String, required: true },
  PhoneNum: { type: String, required: true },
  EmailPOC: { type: String, required: true },
  QnA: [{ type: mongoose.Types.ObjectId, required: true, ref: "QnA" }], //store all objectId of QnA as an array
  file_gallery: [
    { type: mongoose.Types.ObjectId, required: true, ref: "Files" },
  ], //store all objectId of Files as an array
  sector_id: { type: mongoose.Types.ObjectId, required: true, ref: "sectors" },
  web_id: { type: mongoose.Types.ObjectId, required: true, ref: "MainContent" },
});

module.exports = mongoose.model("subSectors", subSectorsSchema);

文档示例：

正如您所看到的，这两个文档之间存在联系（每个扇区可以包含多个子扇区）。

我试图通过使用 mongoose 的填充方法来获取子扇区。这是我的代码，但它不起作用......

  const subSectorId = req.params.subSectorid;
  const sectorId = req.params.sectorid;
  let sector;
  try {
    sector = await Sectors.findById(sectorId)
      .findOne({ _id: subSectorId })
      .populate("subSectors");
  } catch (err) {
    const error = new HttpError(
      "Something went wrong, could not delete sector.",
      500
    );
    return next(error);
  }

  if (!sector) {
    const error = new HttpError("Could not find sector for this id.", 404);
    return next(error);
  }

我得到的响应是：“消息”：“找不到此 ID 的扇区。”

我发送的参数是（你可以在图像中看到它们属于我附加的文档照片）：

const subSectorId = 62dd1c9f720d07f2488c65a3
const sectorId = 62dd21a82bf3289ef6f08219

谢谢

Answer 1

我自己解决问题:)

 sector = await Sectors.findById(sectorId).populate({
   path: "subSectors",
   match: { _id: subSectorId },
 });