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NodeJS: Error during posting an order using Mongoose

I'm working with NodeJS and Mongoose, it's a shopping cart. I'm getting an error during posting the order.

This is the error output:

Error: Order validation failed: user.userId: Path `user.userId` is required.
    at ValidationError.inspect (/opt/sourcecode/sandboxnodejs/node_modules/mongoose/lib/error/validation.js:48:26)
    at formatValue (node:internal/util/inspect:763:19)
    at inspect (node:internal/util/inspect:340:10)
    at formatWithOptionsInternal (node:internal/util/inspect:2006:40)
    at formatWithOptions (node:internal/util/inspect:1888:10)
    at console.value (node:internal/console/constructor:323:14)
    at console.log (node:internal/console/constructor:359:61)
    at /opt/sourcecode/sandboxnodejs/controllers/shop.js:108:29
    at processTicksAndRejections (node:internal/process/task_queues:96:5) {
  errors: {
    'user.userId': ValidatorError: Path `user.userId` is required.
        at validate (/opt/sourcecode/sandboxnodejs/node_modules/mongoose/lib/schematype.js:1277:13)
        at /opt/sourcecode/sandboxnodejs/node_modules/mongoose/lib/schematype.js:1260:7
        at Array.forEach (<anonymous>)
        at ObjectId.SchemaType.doValidate (/opt/sourcecode/sandboxnodejs/node_modules/mongoose/lib/schematype.js:1210:14)
        at /opt/sourcecode/sandboxnodejs/node_modules/mongoose/lib/document.js:2700:18
        at processTicksAndRejections (node:internal/process/task_queues:78:11) {
      properties: [Object],
      kind: 'required',
      path: 'user.userId',
      value: undefined,
      reason: undefined,
      [Symbol(mongoose:validatorError)]: true
    }
  },
  _message: 'Order validation failed'
}

This is the link to the gist: https://gist.github.com/hftamayo/bba430df7070bf6d141aeddcbb698716

The main method in the controller that trigger this error is this:

exports.postOrder = (req, res, next) => {
  req.user
    .populate("cart.items.productId")
    .then((user) => {
      const products = user.cart.items.map((i) => {
        return { quantity: i.quantity, product: { ...i.productId._doc } };
      });
      const order = new Order({
        user: {
          name: req.user.name,
          userId: req.user.userId
        },
        products: products,
      });
      return order.save();
    })
    .then((result) => {
      return req.user.clearCart();
    })
    .then(() => {
      res.redirect("/orders");
    })
    .catch((err) => console.log(err));
};

the repo is this one:https://github.com/hftamayo/sandboxnodejs/tree/chapt12_mongoose

Other components involved are:

shop.js (controller)
user.js (model)
order.js (model)

I have several days trying to debug it, I know the userId is null but I'm not getting why, any hints will be highly appreciated.

Best wishes

The bug was about an undefined parameter (userId):

user: {
          name: req.user.name,
          userId: req.user.userId
        },

So, this did the trick:

user: {
          name: req.user.name,
          userId: req.user._id
        },

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