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0003. Web/API parity, checked by a test

  • Status: accepted

  • Date: 2026-11-07

Context

Principle P8: no function exists only in the web interface. The iOS app and the integrations must be able to do everything a person can do in a browser. A rule that is only written down is forgotten.

Decision

src/housecairn/parity.py holds a registry:

  • PARITY maps each named web route to the API route(s) offering the same function, for example homes:detail to api-v1:home-detail;

  • EXEMPT lists web routes without business function (landing page, health probe, API documentation), each with its reason;

  • allauth and the Django admin are exempt as a whole: account management is not exposed to API tokens, and the admin is an operator tool.

tests/test_parity.py walks the URL configuration and fails if a named web route is neither mapped nor exempted, or if a mapped API route does not exist.

Consequences

  • Adding a web screen without its API endpoint fails the test suite.

  • The registry is reviewed with every pull request that adds a route.

  • Parity is checked at route level; that the API does the same thing is the job of the service layer (0002), which both call.

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