Global option to disable id virtual for all schemas by default

[vkarpov15]

Prerequisites

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

🚀 Feature Proposal

Schemas have an id virtual by default. This virtual returns the _id as a string. While useful in some cases, in many cases I'd like to disable it for all schemas.

Motivation

The id virtual is unnecessary for many applications. It would be helpful to have a way to disable it for the whole app by default, rather than adding id: false for every schema, or having to write a plugin.

Example

mongoose.set('id', false);

const Test = mongoose.model('Test', Schema({ name: String }));
const doc = new Test({});
doc.id; // undefined