Unable to allow timestamps in the sub document when having _id field in the main document

[fsevenm]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

6.0.0

Node.js version

12.22.12

MongoDB server version

4.4.17

Typescript version (if applicable)

No response

Description

I explain this based on the code in Step to Reproduce. It throws an error when setting timestamps: true in the level 2 sub document (dimensions) when having an _id in root document DataSchema for the tags field, regardless of the value. Here is the error:

/home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/helpers/timestamps/setupTimestamps.js:56
      this.constructor.base.now();
                            ^

TypeError: Cannot read property 'now' of undefined
    at SingleNested.schema.methods.initializeTimestamps (/home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/helpers/timestamps/setupTimestamps.js:56:29)
    at model.schema.methods.initializeTimestamps (/home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/helpers/timestamps/setupTimestamps.js:71:16)
    at /home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/model.js:3519:20
    at Array.map (<anonymous>)
    at /home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/model.js:3513:38
    at /home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/helpers/parallelLimit.js:49:16
    at /home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/model.js:3463:9
    at /home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/helpers/promiseOrCallback.js:26:18
    at /home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/document.js:2589:7
    at complete (/home/fsevenm/works/redacted/scripts/node/node_modules/mongoose/lib/document.js:2955:5)

I understand that I can just disable the _id directly in the sub schema ( ImageShema), but I think it's still an issue since it should allow disabling the _id that way as well, unless it's a known limitation. Not to mention, it actually still works if dimensions is an array (commented code).

Steps to Reproduce

const mongoose = require("mongoose");
const { Schema } = mongoose;

const mongoURI = "mongodb://root:root@127.0.0.1:27017/sample_collection";

(async () => {
  mongoose.connect(mongoURI);

  const ImageShema = new mongoose.Schema(
    {
      dimensions: {
        // type: [
        //   new mongoose.Schema(
        //     {
        //       width: { type: Number, required: true },
        //       height: { type: Number, required: true },
        //     },
        //     { timestamps: true }
        //   ),
        // ],
        type: new mongoose.Schema(
	      {
	        width: { type: Number, required: true },
	        height: { type: Number, required: true },
	      },
	      { timestamps: true }
        ),
        required: true,
      },
    },
    { timestamps: true }
  );

  const DataSchema = new mongoose.Schema({
    tags: { type: ImageShema, required: false, _id: false },
  });

  const DataModel = mongoose.model("sample_data", DataSchema);

  await DataModel.insertMany([
    {
      tags: {
        // dimensions: [
        //   {
        //     width: 960,
        //     height: 589,
        //   },
        // ],
        dimensions: {
          width: 960,
          height: 589,
        },
      },
    },
  ]);

  mongoose.connection.close();
})();

Expected Behavior

Should be able to have timestamps: true for dimensions, no matter we set the _id for ImageSchema in the schema itself or in the root schema declaration, as well as array or not array field.

[IslandRhythms]

Had to change the connection string. I don't get the error on mongoose 6 but I do get it on mongoose 7.1.0

const mongoose = require("mongoose");
const { Schema } = mongoose;

const mongoURI = "mongodb://localhost:27017";

(async () => {
  mongoose.connect(mongoURI);

  const ImageShema = new mongoose.Schema(
    {
      dimensions: {
        // type: [
        //   new mongoose.Schema(
        //     {
        //       width: { type: Number, required: true },
        //       height: { type: Number, required: true },
        //     },
        //     { timestamps: true }
        //   ),
        // ],
        type: new mongoose.Schema(
	      {
	        width: { type: Number, required: true },
	        height: { type: Number, required: true },
	      },
	      { timestamps: true }
        ),
        required: true,
      },
    },
    { timestamps: true }
  );

  const DataSchema = new mongoose.Schema({
    tags: { type: ImageShema, required: false, _id: false },
  });

  const DataModel = mongoose.model("sample_data", DataSchema);

  await DataModel.insertMany([
    {
      tags: {
        // dimensions: [
        //   {
        //     width: 960,
        //     height: 589,
        //   },
        // ],
        dimensions: {
          width: 960,
          height: 589,
        },
      },
    },
  ]);

  mongoose.connection.close();
})();