Unordered insertMany drops per-document validation errors when rawResult is false

[MOHITKOURAV01]

Prerequisites

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

Mongoose version

6.13.1

Node.js version

14.21.3

MongoDB server version

5.0.26

Typescript version (if applicable)

4.8.4

Description

Calling insertMany() with ordered=false and rawResult=false silently drops the per-document validation errors. You only get the successfully inserted docs (or a driver error), so there’s no way to tell which documents failed validation without re-running the entire batch.

Steps to Reproduce

const schema = new Schema({ name: { type: String, required: true }, year: Number });
const Movie = mongoose.model('Movie', schema);

await Movie.insertMany([
{ foo: 'invalid 1' },
{ name: 'valid movie' },
{ bar: 'invalid 2' }
], { ordered: false });
// Promise resolves with [ { name: 'valid movie' } ]
// but there is no information about the two invalid docs

Expected Behavior

Even when rawResult=false, the resolved docs (or thrown error) should expose mongoose.validationErrors/results so callers can identify which indexes failed validation, similar to the rawResult behavior.

[shubhanshu2103]

@MOHITKOURAV01 assign me this issue

[vkarpov15]

There's a throwOnValidationError option you can use to opt in to throwing an error on validation errors in Mongoose 6, for example the following throws an error:

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

const schema = new Schema({ name: { type: String, required: true }, year: Number });
const Movie = mongoose.model('Movie', schema);

void async function main() {
  await mongoose.connect('mongodb://127.0.0.1:27017/mongoose_test');

  // Throws "MongooseBulkWriteError: insertMany failed with 2 Mongoose validation errors: Movie validation failed: name: Path `name` is required., Movie validation failed: name: Path `name` is required."
  const res = await Movie.insertMany([
    { foo: 'invalid 1' },
    { name: 'valid movie' },
    { bar: 'invalid 2' }
  ], { ordered: false, throwOnValidationError: true });
  console.log('res', res);
}();   

Does that help?