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Clarifies Django's object-permission hook and enforces ownership or tenancy in the query and policy path.
Distinguishes Django model saving, explicit model validation, form validation, and database constraints.
Repairs a Django serialization path with select_related and prefetch_related, then locks the query shape with a regression test.
Defines Django transaction nesting, exception boundaries, and post-commit work without promising durability.
Explains backend ordering, session affinity, permission aggregation, and the difference between identity and authorization.
Connects browser-sent session cookies to Django's CSRF token checks for unsafe requests.
Explains how DRF turns an HTTP representation into request data and selects a response representation.
Traces serializer relation access back to queryset loading and verifies the fix with query evidence.
Traces a Django request through middleware, URL resolution, a view, application work, and response processing.
Explains ordered URL matching, included URL configurations, reverse lookup, and application namespaces.
Uses Django cache configuration to control freshness, namespace sharing, and safe cache migrations.
Connects Django deployment interfaces with the real sync and async call chain.
Chooses the smallest DRF view abstraction that expresses an endpoint clearly.
Chooses atomic database expressions, row locks, and constraints from the invariant being protected.
Verifies commit callbacks without confusing callback registration with durable external delivery.
Maps DRF and application failures into stable client errors while preserving internal diagnostic evidence.
Makes nested create and update semantics, authorization, identity, and transaction ownership explicit.
Organizes Django configuration without duplicating environments or leaking secrets into source code.
Builds a useful DRF lifecycle model for policy checks, handler execution, exception conversion, and rendering.
Uses a database transaction and row lock to keep stock non-negative when reservations race.
Keeps representation validation at the API boundary and moves changing workflows to explicit application owners.
Explains why object checks do not automatically filter list results or authorize object creation.
Defines DRF as an API toolkit layered on Django rather than a replacement framework.
Defines Django as a batteries-included Python web framework and separates framework conveniences from application design.