fix(nextly): introspection resolves a table the way an unqualified write does - #1721
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📝 WalkthroughWalkthroughPostgreSQL introspection now resolves columns, types, and indexes through the active ChangesSearch-path introspection
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The PostgreSQL introspection change is intended to follow search_path, but its integration test may configure a different database session from the one used by assertions. This leaves the key tenant-schema regression protection unreliable until the test is session-pinned. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
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| * resolves, and the equality asks whether they are the same relation. The same | ||
| * device the sequence-ownership check in `introspect-live.ts` already uses. | ||
| */ | ||
| export const PG_RELATION_THE_WRITES_HIT: SQL = sql`format('%I.%I', c.table_schema, c.table_name)::regclass = to_regclass(c.table_name)`; |
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When a PostgreSQL collection uses a supported custom dbName containing uppercase letters (for example, LegacyPosts becomes the quoted table "dc_LegacyPosts"), passing the catalog text directly to to_regclass reparses it as an unquoted identifier and folds it to lowercase; names containing dots are similarly parsed as qualified names. This predicate therefore drops the table's column/type rows, while the equivalent lookup in introspect-live.ts also loses its indexes, making an existing table appear absent and causing migration generation or application to fail. Quote the catalog name before resolution and use the same resolution implementation for both column and index introspection.
AGENTS.md reference: AGENTS.md:L288-L291
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Confirmed and fixed — and it is worse than hypothetical: resolveCollectionTableName
passes an author's dbName through verbatim, prefixing dc_ and nothing
else, so dbName: "LegacyPosts" really does produce dc_LegacyPosts. That file's
own comment already flags identifier case as a hazard it cannot settle.
to_regclass takes text and reparses it as an identifier reference, so the
unquoted name folded to dc_legacyposts and resolved to nothing — and an absent
answer is the worst one this module can give, because a diff then proposes to
create a table that already exists.
Both predicates now quote first, and both live in pg-visible-relation.ts rather
than inline, so the column read and the index read cannot drift about which
relation they describe — the failure that would otherwise take the columns from
one table and the indexes from another.
A test covers it directly: a table created as "nx_SearchPath_Mixed" in the
tenant schema, asserted to introspect its own column. Without quote_ident it
reads as absent.
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Actionable comments posted: 1
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Inline comments:
In
`@packages/nextly/src/domains/schema/pipeline/diff/__tests__/introspect-search-path.integration.test.ts`:
- Line 69: Update the integration test around introspectLiveSnapshot and
queryLiveColumnTypes to check out one client-bound Drizzle instance from the
pool and reuse it for search_path setup, test operations, assertions, and
cleanup. Ensure the client is released after the test completes, including
failure paths, and avoid using separate pooled execute calls that could run on
different PostgreSQL sessions.
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| await client.connect(); | ||
| db = drizzle({ client }); | ||
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| const run = (text: string) => client!.query(text); |
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When this PostgreSQL integration suite runs, run sends all setup DDL directly through pg.Client.query, bypassing the repository's required Drizzle-only database-access path; the following CREATE TABLE statements are also hand-copied fixture DDL. Keep the dedicated Client for session affinity, but execute the setup through the wrapped Drizzle connection and derive table DDL through the production helpers rather than introducing a second DDL implementation.
AGENTS.md reference: AGENTS.md:L274-L276
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Agreed on the access path and fixed in #1727: setup and teardown now go through
db.execute on the client-bound instance, so the statements that establish the
session travel the same path the reads do. The Client stays and is still closed
in afterAll — it is what pins the session.
On deriving the DDL from production helpers, I have not done that, and I would
rather say so plainly than be quietly partial.
These tables are synthetic — a decoy and a subject that exist only to be resolved
by the search path, with no production counterpart. The hazard the rule guards is
a fixture copying a real table's definition and then drifting from it, and there
is nothing here to drift from. Deriving them from a real table would couple the
file to that table's shape and change what it measures.
Checked rather than assumed — this repository's own PostgreSQL integration tests
create synthetic probe tables inline for the same reason:
database/__tests__/integration/schema-push.integration.test.ts:74
CREATE TABLE "dc_int_products" ...
di/load-dynamic-slugs.integration.test.ts:33
CREATE TABLE dynamic_collections (slug TEXT)
getSchemaEventsDdl, the helper AGENTS.md names, builds one specific production
table. There is no helper for a two-column decoy, and adding one would be the
second DDL implementation the advice warns against.
The reasoning is now in the file's docblock so the next reader does not have to
re-litigate it. Happy to be overruled if the rule is meant to cover synthetic
fixtures too — in that case the right fix is a shared probe-table helper rather
than reusing a production table's shape, and that is worth its own change.
1 participant
nextly migratereads a PostgreSQL database's current shape to decide what tochange. Those reads were pinned to a schema named
public. Every statement thispackage writes is unqualified, so PostgreSQL resolves it across the whole
search_path. On a deployment that uses its own schema — one per tenant, or ahouse convention — the reader and the writer were looking at different tables.
Why not
current_schema()Because this package already answered that, in
live-table-facts.ts:So this is convergence onto a rule the package had already settled, not a new
idea. The reads now compare by identity —
format('%I.%I', …)::regclassagainstto_regclass(name)— which is the same device the sequence-ownership check threelines above already used.
Scope, and the part that is NOT here
The ticket names two sites. A grep found seven:
This PR takes the three in the schema pipeline. The other four are filed as
finding:pg-schema-pinned-in-seven-places, and one of them is destructive:cli/commands/migrate-fresh.ts:336listspublic's tables in order to DROPthem, so on a tenant search path it drops unrelated tables and leaves the real
ones. It sits in a different subsystem and deserves its own review; one of the
remaining sites is inside PR #1659's territory.
How this is verified — and where
Not locally. The predicate is SQL a server evaluates, and no PostgreSQL was
reachable from this machine (no Docker daemon). What I verified here: it
typechecks, it lints, the 11,875 unit tests pass, and the new integration file is
collected by
vitest.integration.config.ts(3 tests, skipped for thedocumented missing-URL reason) rather than silently excluded.
The Postgres CI leg is the oracle, and I will read that job specifically to
confirm the three tests RAN rather than skipped — a skip reads as a pass.
The test creates a decoy: the same table name in
publicwith a differentcolumn, the real one in a tenant schema, and
search_pathset totenant, public. Pointing the search path at an empty schema would only provethat something was found somewhere; a test that cannot tell "read the right
table" from "read any table" passes on a predicate that names
publicoutright.It covers all three reads — columns, indexes, and the live column types the type
diff trusts.
On the fallow warning
fallowreportsduplication_introduced = 2between the two files' PostgreSQLbranches. I did not introduce it. Control: reverting only the WHERE clauses
to
'public'— the rule absent entirely — reports the same two clone groupsbetween the same two files. My diff touches lines inside both instances, which is
enough for fallow to attribute them. The similarity is structural: both are "if
postgresql → run an
information_schemaquery → build a map".I extracted the predicate into
pg-visible-relation.tsanyway, not to silencethat warning (it did not) but because the rule needs one home and one
explanation, so the next person to change it finds both call sites.
Verdict is
warn, exit 0;dead_code,complexityandstylingintroduced areall 0.
Gates
pnpm build0 · nextlycheck-types0lint0vitest0 (934 files, 11,875tests) ·
changeset status0.Summary by CodeRabbit
search_pathinstead of assuming tables are in thepublicschema.