AssetSchema.js

const AssetSchema = new Schema({
  assetTag: { type: String, required: true },
  assetName: { type: String, required: true },
  assetDescription: { type: String, required: true },
  assetCatNo: { type: String, required: true },
  assetStatus: { type: String },
  storageLatitude: { type: String },
  storageLongitude: { type: String},
  assetSerialNumber: { type: String},
  assetType: { type: String },
  others: { type: Object },
  parent: {
    type: Schema.Types.ObjectId,
    default: null,
    ref: "Asset",
  },
  ancestors: [
    {
      _id: {
        type: mongoose.Schema.Types.ObjectId,
        ref: "Asset",
      },
      name: String,
      slug: String,
    },
  ],
}, {
  timestamps: true
});

AssetSchema.pre("save", async (next) => {
  this.slug = createSlug(this.assetType);
  next();
});

buildAncestors.js

export default buildAncestors = async (id, parent_id) => {
  let ancesta = [];
  try {
    let parent_asset = await Asset.findOne(
      { _id: parent_id },
      { name: 1, slug: 1, ancestors: 1 }
    ).exec();
    if (parent_asset) {
      const { _id, name, slug } = parent_asset;
      const ancesta = [...parent_asset.ancestors];
      ancesta.unshift({ _id, name, slug });
      const asset = await Asset.findByIdAndUpdate(id, {
        $set: { ancestors: ancesta },
      });
    }
  } catch (err) {
    console.log(err.message);
  }
};

CreateNewAsset.js

router.post("/", async (req, res) => {
  let asset = new Asset();

  //ASSET
  const assetTag = req.body.assetTag;
  const assetName = req.body.assetName;
  const assetDescription = req.body.assetDescription;
  const assetCatNo = req.body.assetCatNo;
  const assetStatus = "receive";
  const storageLatitude = req.body.assetLatitude;
  const storageLongitude = req.body.assetLongitude;
  const assetSerialNumber = req.body.assetSerialNumber;
  const assetType = req.body.assetType; //PALLETE //CRATE OR UNIT

  const asset = new Asset({
    assetTag,
    assetName,
    assetDescription,
    assetCatNo,
    assetStatus,
    storageLatitude,
    storageLongitude,
    assetSerialNumber,
    others,
    assetType,
    parent: req.body.assetType ? req.body.assetType : null
  });

  asset.save((err, result) => {
    if(result) {
      buildAncestors(asset._id, req.body.assetType)
    }
  })
});

createSlug.js

export default createSlug = function slugify(string) {
  const a = "àáâäæãåāăąçćčđďèéêëēėęěğǵḧîïíīįìłḿñńǹňôöòóœøōõőṕŕřßśšşșťțûüùúūǘůűųẃẍÿýžźż·/_,:;";
  const b = "aaaaaaaaaacccddeeeeeeeegghiiiiiilmnnnnoooooooooprrsssssttuuuuuuuuuwxyyzzz------";
  const p = new RegExp(a.split("").join("|"), "g");

  return string
    .toString()
    .toLowerCase()
    .replace(/\s+/g, "-")
    .replace(p, (c) => b.charAt(a.indexOf(c)))
    .replace(/&/g, "-and-")
    .replace(/[^\w\-]+/g, "")
    .replace(/\-\-+/g, "-")
    .replace(/^-+/, "")
    .replace(/-+$/, "");
};

INSTRUCTIONS.md

Modify Asset Model to suit new hierach structure as above