NeedmeFordev 7315d25cbc Fix retrieval API handling for omitted dataset IDs (#13990) ...

### What problem does this PR solve?

This PR fixes a mismatch between the MCP retrieval contract and the
backend retrieval API.

`ragflow_retrieval` already describes `dataset_ids` as optional, but
`/api/v1/retrieval` still rejected omitted or empty `dataset_ids` with
`` `dataset_ids` is required. ``. That made MCP retrieval fail even
though the tool schema promised that the request could search across all
available datasets.

This change updates `/api/v1/retrieval` to accept missing or empty
`dataset_ids`, resolve all accessible datasets for the authenticated
user, and keep the route schema aligned with the new runtime behavior.
It also adds focused unit coverage for the fallback resolution path and
the no-accessible-datasets case.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Fixes: #13981

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* Improved dataset resolution to reliably discover all accessible
datasets through proper pagination, replacing the previous parsing
method.
* Enhanced error handling with clearer messaging when no datasets are
available for retrieval.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

2026-04-10 11:34:15 +08:00

..

client

Feat: MCP host mode supports STREAMABLE-HTTP endpoint (#13037)

2026-02-06 16:22:43 +08:00

server

Fix retrieval API handling for omitted dataset IDs (#13990)

2026-04-10 11:34:15 +08:00