Add partial index conditions for references#795
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zachdaniel
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## Summary - Nullable `belongs_to` relationships now get **partial indexes** excluding `NULL` rows: references use `index_where: :not_nil`, custom indexes use `where: "fk_id IS NOT NULL"`. FK lookups are equality matches (always `IS NOT NULL`), so the smaller index serves them fully. `allow_nil? false` relationships keep full indexes. - On multitenant resources, the tenant attribute gets its own single-column index when every other FK index is partial, since partial FK indexes cannot serve tenant-only lookups. - Combined with #2 on the multitenant single-column index: `all_tenants?: true` + `include_base_filter?: false` + stable `{table}_{fk_id}_fkey_index` name, plus the partial `where` when nullable. - Bumps version to 0.5.0 with changelog and README updates. Requires ash_postgres with `index_where` on references (ash-project/ash_postgres#795) — not yet in a hex release, dependency stays on GitHub main. ## Test plan - `mix test` (22 tests, including new `test/partial_index_test.exs`)
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Adds
index_whereto references, supporting custom conditions and:not_nil.Changing the condition recreates only the index without modifying the foreign key.
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