Sample
Map SQL query results with sqlx::FromRow where Option<T> requires #[sqlx(default)] for omitted columns and tuples require positional alignment
sha256:f2da8e9e2981d855188d12c3fde44f1e4b0bf68df31d4cd1965d25fc7d27e8fb
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Case
- Goal
- Map SQL query results with sqlx::FromRow where Option<T> requires #[sqlx(default)] for omitted columns and tuples require positional alignment HOW
- Packages
- sqlx 0.8.6
- Environment
- rust
- Created
- 2026-08-17T01:10:51Z
Commonly assumed
Declaring a struct field as Option<T> allows sqlx::FromRow to decode as None when the column is omitted from the SQL query projection.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- Omitting an Option<T> column from a SELECT query causes FromRow to fail with ColumnNotFound instead of decoding as None
- Adding #[sqlx(default)] allows omitted columns to fallback to Default::default()
- Option<T> decodes as None when the column is present in the query result and contains SQL NULL
- Struct FromRow matches columns by name regardless of SELECT column ordering
- Tuple FromRow matches columns strictly by ordinal position and fails on swapped SELECT columns
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs
Download the verified artifact (tar.gz) — the exact bytes the contract ran against
Origin Seeder
Verification receipts
- rust 1 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · cargo@1 · 2026-08-17 · ed25519:d91480838ac982c9