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0006. Every query scoped to the user’s homes

  • Status: accepted

  • Date: 2026-11-07

Context

One instance serves several homes and several people: a household, a tenant with read-only access, a craftsperson. A single forgotten filter would expose another home’s data. The filter must be in one place and used everywhere.

Decision

  • homes.Home and homes.Membership (roles owner, member, read_only) exist from the first migration. Every business model inherits homes.models.HomeOwnedModel (a home foreign key and an in_homes() query method).

  • homes.services.homes_for(user, restrict_to=None) is the only function that decides which homes a user sees: active memberships of an active user, optionally narrowed to a token’s homes.

  • homes.scoping.HomeScopedMixin gives web and API views get_homes() and get_home() (from the home_id URL parameter). WebHomeScopedMixin adds the sign-in requirement for web views. A home outside the user’s scope answers 404, never 403, so its existence does not leak.

  • Write rights depend on the role (owner and member write, read_only reads), decided by homes.services.can_write.

Consequences

  • New business views start from these mixins and query Model.objects.in_homes(self.get_homes()).

  • Tests for each new resource must include the « other user’s home » case, by the web and by the API, as tests/test_homes.py does for homes.

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