refactor(postgrest)!: collapse the builder generics and wrapper types - #1826
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`PostgrestBuilder<T, S, R>` becomes `PostgrestBuilder<T>`, where `T` is what awaiting the request resolves to. Each step that changes the result (`select()`, `single()`, `maybeSingle()`, `csv()`, `count()`, `withConverter()`) supplies a decoder for the response, and the decoders compose in call order, so a converter is a terminal mapping over whatever the chain resolved to instead of a pair of type parameters threaded through every builder signature. `RawPostgrestBuilder` and `ResponsePostgrestBuilder` are removed. They only existed to give `withConverter()` two different return types, which the composed decoders make unnecessary: `withConverter()` and `count()` live on `PostgrestBuilder<T>` and can be called in either order. The per-request timeout override moves from `retry(requestTimeout:)` to its own `requestTimeout()` method on the query builder and every executable builder. The timeout bounds a single attempt and applies with retries disabled, so it deliberately stays out of `SupabaseRetryOptions`. Closes #1594
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughChangesPostgREST builder unification
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Refactor Sequence Diagram(s)sequenceDiagram
participant Client
participant PostgrestBuilder
participant PostgREST
Client->>PostgrestBuilder: Build query with count and converter
PostgrestBuilder->>PostgREST: Execute request
PostgREST-->>PostgrestBuilder: Return response body and row count
PostgrestBuilder->>PostgrestBuilder: Apply decoders in chain order
PostgrestBuilder-->>Client: Return resolved result
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Inline comments:
In `@MIGRATION.md`:
- Line 1493: Update the PostgrestBuilder migration table entry to preserve
operation order: map PostgrestBuilder(count: …, converter: …) to
PostgrestBuilder(…).withConverter(…).count(…), so the converter receives the
data before the count wrapper.
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AGENTS.mdMIGRATION.mdpackages/postgrest/lib/src/postgrest.dartpackages/postgrest/lib/src/postgrest_builder.dartpackages/postgrest/lib/src/postgrest_filter_builder.dartpackages/postgrest/lib/src/postgrest_query_builder.dartpackages/postgrest/lib/src/postgrest_transform_builder.dartpackages/postgrest/lib/src/postgrest_typed_builder.dartpackages/postgrest/lib/src/raw_postgrest_builder.dartpackages/postgrest/lib/src/response_postgrest_builder.dartpackages/postgrest/test/basic_test.dartpackages/postgrest/test/order_default_test.dartpackages/postgrest/test/retry_test.dartsdk-compliance.yaml
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- packages/postgrest/lib/src/raw_postgrest_builder.dart
- packages/postgrest/lib/src/response_postgrest_builder.dart
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🔵 Needs a closer look
It changes foundational request decoding and several public builder APIs, warranting final human validation.
Pull request overview
Refactors PostgREST builders into a single-result generic model and separates per-request timeouts from retry configuration.
Changes:
- Replaces wrapper builders and three generic parameters with composable decoders.
- Adds chainable
count(),withConverter(), andrequestTimeout(). - Updates tests, migration guidance, and API compliance declarations.
File summaries
| File | Description |
|---|---|
sdk-compliance.yaml |
Reconciles changed public symbols. |
packages/postgrest/test/retry_test.dart |
Tests timeout propagation and retries. |
packages/postgrest/test/order_default_test.dart |
Updates builder generic usage. |
packages/postgrest/test/basic_test.dart |
Tests decoder composition order. |
packages/postgrest/lib/src/response_postgrest_builder.dart |
Removes the response wrapper. |
packages/postgrest/lib/src/raw_postgrest_builder.dart |
Removes the raw wrapper. |
packages/postgrest/lib/src/postgrest.dart |
Documents per-request timeout overrides. |
packages/postgrest/lib/src/postgrest_typed_builder.dart |
Adopts the simplified builder type. |
packages/postgrest/lib/src/postgrest_transform_builder.dart |
Integrates decoder-based result transformations. |
packages/postgrest/lib/src/postgrest_query_builder.dart |
Adds query-level timeout configuration. |
packages/postgrest/lib/src/postgrest_filter_builder.dart |
Preserves fluent timeout and retry chaining. |
packages/postgrest/lib/src/postgrest_builder.dart |
Implements the unified decoder architecture. |
MIGRATION.md |
Documents breaking migrations. |
AGENTS.md |
Describes the new builder model. |
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What
Resolves the three open design questions in #1594 for v3.
One type parameter.
PostgrestBuilder<T, S, R>is nowPostgrestBuilder<T>, whereTis what awaiting the request resolves to. Every step that changes the result (select(),single(),maybeSingle(),csv(),explain(),count(),withConverter()) supplies a private decoderT Function(Object? body, int? count), and decoders compose in call order. The converter is therefore a terminal mapping over whatever the chain resolved to, rather than anS/Rpair threaded through every builder signature. The runtimeR == PostgrestListre-typing of decoded JSON is kept as a single_bodyAs<T>helper.No wrapper classes.
RawPostgrestBuilderandResponsePostgrestBuilderare gone. They only varied the return type ofwithConverter(). BothwithConverter()andcount()now live onPostgrestBuilder<T>:A converter placed after
count()receives the wholePostgrestResponse, so the old order fails to compile and points at each call site to update. This also fixesgeojson(), which returned aResponsePostgrestBuilderwhose declaredTwas aMapwhile claiming aPostgrestResponsefromwithConverter().requestTimeoutstays separate from the retry options. It bounds a single attempt and applies with retries disabled, so it is not retry configuration andSupabaseRetryOptions(shared with auth and storage, which have no such knob) deliberately does not carry it. To make that explicit the per-request override moves out ofretry(requestTimeout:)into its ownrequestTimeout(Duration)method, available at the same points asretry(): onPostgrestQueryBuilderbefore the operation and on every executable builder after it, keeping its place in the filter chain.Public API changes
PostgrestBuilder<T, S, R>PostgrestBuilder<T>RawPostgrestBuilder,ResponsePostgrestBuilderPostgrestBuilder(count: …, converter: …)PostgrestBuilder(…).count(…).withConverter(…)PostgrestTransformBuilder.count()PostgrestBuilder.count()geojson()→ResponsePostgrestBuilder<Map, Map, Map>PostgrestBuilder<Map<String, dynamic>>.retry(requestTimeout: d).requestTimeout(d)MIGRATION.mdhas a new section covering all of it,AGENTS.mddescribes the decoder model, andsdk-compliance.yamlis reconciled (wrapper symbols pruned,PostgrestBuilder.withConverter,PostgrestBuilder.countand the fourrequestTimeoutmethods registered).Tests
withConverterbefore and aftercount(), aftersingle()and aftermaybeSingle().requestTimeout()on the executable builder, on the query builder before the operation, and mid-chain followed by filters and transforms.postgrestsuite passes locally with--concurrency=1(351 tests).supabase,supabase_flutterand both example apps analyze cleanly.check-api-symbols,check-drift,validate-compliance) all pass.Summary by CodeRabbit
New Features
withConverter(), including selections, single-row responses, optional results, and counts.requestTimeout()configuration throughout query chains.Breaking Changes
.retry(requestTimeout: ...)with.requestTimeout(...).PostgrestBuilder<T>.count()is now provided byPostgrestBuilderand can be combined with result conversion.Documentation