Deep object schema regression in v8

[vladkrasn]

Is there an existing issue for this?

• I have searched the existing issues

Current behavior

I have a fairly complex object that is being sent and validated through an http query. Object schema.

Here how it looks with nestjs/swagger@8. Looks like a plain deep object, which it isn't:

Minimum reproduction code

https://github.com/vladkrasn/nest-swagger-8-bug

Steps to reproduce

1. Clone git repository
2. npm install
3. npm run start:dev
4. Go to localhost:3000/swagger and check out the object in its 7 glory
5. npm install @nestjs/swagger@8
6. npm run start:dev
7. Go to localhost:3000/swagger and check out the object in its 8 disarray

Expected behavior

Here's how it looks when rendered by nestjs/swagger@7:

I tried to search for stuff that was changed in 8 that would've affected this, but couldn't find it. Might be a regression.

Package version

8.1.3

NestJS version

10.4.4

Node.js version

22.6.0

In which operating systems have you tested?

• macOS
• Windows
• Linux

Other

No response

[vladkrasn]

Still present in v11 btw

[kamilmysliwiec]

This change is intentional. Auto-expanding objects at the first level previously caused inconsistencies between query/parameter models and body payloads, and it led to bugs that this update helps fix