_id: false has no meaning

[332lfgb6]

Prerequisites

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

Mongoose version

8.0.3

Node.js version

20.10.0

MongoDB server version

4

Typescript version (if applicable)

No response

Description

I specify _id: false because I want to customize the primary key, but I still get an error when model.save(): MongooseError: document must have an _id before save, this is not a contradiction, when I specify _id: false, save should not have this error,otherwise, id: false loses its meaning.

Steps to Reproduce

1. _id: false
2. model.create or save

Expected Behavior

When id:false is specified, presave does not need to check the _id

[vkarpov15]

Unfortunately MongoDB doesn't allow you to save a document without an _id. MongoDB will create an _id property for you when you create a document, even if you don't specify one. We should update our docs to specify that the _id option is only useful for subdocuments.