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Schema.clone() drops $timestamps, so embedded discriminators with a timestamped child schema throw on save #16650
Description
Prerequisites
- I have written a descriptive issue title
- I have searched existing issues to ensure the bug has not already been reported
Mongoose version
9.11.4
Node.js version
24
MongoDB server version
8
Typescript version (if applicable)
No response
Description
If a schema contains a child schema with timestamps: true, Mongoose adds $timestamps and a timestampsPreSave hook to the parent. clone() copies the hook but not $timestamps, so saving a document built from the clone throws:
TypeError: Cannot destructure property 'createdAt' of 'schema.$timestamps' as it is undefined.
at EmbeddedDocument.timestampsPreSave (lib/helpers/timestamps/setupTimestamps.js:96:11)
Steps to Reproduce
const child = new Schema({ name: String }, { timestamps: true });
const base = new Schema({ kind: String }, { discriminatorKey: 'kind' });
const schema = new Schema({ items: [base] });
schema.path('items').discriminator('WithChild', new Schema({ child }));
const Test = mongoose.model('Test', schema);
await Test.create({ items: [{ kind: 'WithChild', child: { name: 'foo' } }] }); // throws
Expected Behavior
The clone saves like the original.
Activity
test: reference Automatticgh-16650