## Context
The `createMany` upsert path resolved conflicts by scanning individual
field
metadata and only treating a field as a conflict target when it was
flagged
`isUnique` (plus the primary `id`). This ignored **composite unique
indexes**
(multi-column unique constraints), so upserting against a multi-field
unique
key never matched an existing row and could either insert a duplicate or
fail.
## What changed
- **Conflict groups are now derived from unique indexes**, not from
per-field
`isUnique` flags. `getConflictingFields` reads the object's index
metadata
(`flatIndexMaps`) and builds one `ConflictingFieldGroup` per unique
index
(the primary `id` remains its own group).
- Each index group correctly expands its fields into DB columns,
handling:
- **Composite field types** — expands to the sub-columns included in the
unique constraint (or a specific sub-field when the index targets one).
- **`MANY_TO_ONE` relation fields** — resolves to the join column name.
- **Scalar fields** — used directly.
- `ConflictingFieldGroup.baseField: string` → **`baseFields:
string[]`**, since
a composite index spans multiple fields.
- **Clearer multi-match error message**: conflicting values are now
grouped per
index (`baseFields (fullPath: value, ...)`, groups joined by `;`) so
it's
obvious which unique key caused the ambiguity when a payload matches
different rows across different indexes.
- `CommonCreateManyQueryRunnerService` now fetches `flatIndexMaps` via
`WorkspaceManyOrAllFlatEntityMapsCacheService` and passes them into
`getConflictingFields`; the cache module is wired into
`CoreCommonApiModule`.
## Tests
- New integration suite
`composite-unique-index-upsert.integration-spec.ts`:
- single composite unique index — insert, update-on-match, and
insert-when-key-differs
- **two independent composite unique indexes** — happy path (single row
matches
both) and failure path (payload matches different rows across the two
indexes → `Multiple records found with the same unique field values` /
`BAD_USER_INPUT`).
- Updated unit specs for `get-conflicting-fields`,
`get-matching-record-id`,
`build-where-conditions`, and `categorize-records` to reflect the
index-driven grouping and the `baseFields[]` shape.
## Test plan
- [ ] `npx nx run twenty-server:test:integration:with-db-reset --
composite-unique-index-upsert`
- [ ] `npx nx test twenty-server -- get-conflicting-fields
get-matching-record-id build-where-conditions categorize-records`
- [ ] Manual: upsert against a composite unique index updates the
matching row instead of inserting a duplicate.
fixes
https://github.com/twentyhq/twenty/issues/22580#issuecomment-4894266699
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Etienne
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