How to save new Ad in MongoDB?

// routes/ad
router.post("/ad", requireSignin, ad.create);

// controllers/ad
// imports
import { nanoid } from "nanoid";
import * as config from "../config.js";
import Ad from "../models/ad.js";
import User from "../models/user.js";
import slugify from "slugify";

export const create = async (req, res) => {
  try {
    const { photos, description, address, price, type, landsize } = req.body;

    if (!photos?.length) {
      return res.json({ error: "Photos are required" });
    }
    if (!price) {
      return res.json({ error: "Price is required" });
    }
    if (!type) {
      return res.json({ error: "Is property house or land?" });
    }
    if (!address) {
      return res.json({ error: "Address is required" });
    }
    if (!description) {
      return res.json({ error: "Description is required" });
    }

    const geo = await config.GOOGLE_GEOCODER.geocode(address);
    const ad = await new Ad({
      ...req.body,
      slug: slugify(`${type}-${address}-${price}-${nanoid(6)}`),
      postedBy: req.user._id,
      location: {
        type: "Point",
        coordinates: [geo?.[0]?.longitude, geo?.[0]?.latitude],
      },
      googleMap: geo,
    }).save();

    const user = await User.findByIdAndUpdate(
      req.user._id,
      {
        $addToSet: { role: "Seller" },
      },
      { new: true }
    );
    user.password = undefined;
    user.resetCode = undefined;
    res.json({
      ad,
      user,
    });
  } catch (err) {
    console.log(err);
    res.json({ error: "Something went wrong. Try later." });
  }
};