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Decide between Mongoose discriminators, separate collections, and manual type fields with a comparison table, a working discriminator setup, partial unique indexes, and validation steps.
An API that returns different shapes for the same endpoint forces clients to guess. A discriminator in OpenAPI 3.1 makes polymorphic responses explicit by naming a property that selects the concrete subtype in a oneOf composition.
Goal Preserve subtype information for subdocuments stored inside an array field of a parent schema, so that each element retains its specific discriminator type after a document is saved and later retrieved. Constraints & Uncertainty Mongoose 6+ and 7.x support discriminators for single nested subdocuments via Schema.discriminator() , but the framework d
mongoose
mongodb
openapi