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feature: add document constraints for root and parent docs - #66
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Adds optional, client-defined uniqueness constraints to Document to prevent duplicate models:
uniqOnRoot: unique per document root, author, type and key.uniqOnParent: unique per document root, author, type, parent and key.This supports one main document per user and root, or one child per key, such as a quiz
qid. Both constraints are enforced by the database; documents without keys remain unrestricted.Creating a document with an existing key returns the existing document (
200); new documents return201. Constraints can also be updated or cleared.Includes migration support and cleanup of legacy duplicate main documents.
Some manual migration is needed for documents where the constraints could not be derived - check out the CHANGELOG.md for how to migrate.
Ensure to apply this changes only in combination with the frontend-changes GBSL-Informatik/teaching-dev#328.