Attach record data to BATCH 412 responses.

[n1k0]

In order for clients to properly notify from conflicting records on BATCH operations, it would be useful to have the record data attached to the JSON response body, eg.

{
  "errno": 999,
  "message": "Failed batch subrequest",
  "code": 412,
  "error": "Precondition Failed",
  "data": { "id": "…" }
}

Also, it would be nice to have a dedicated errno and message for races.

[Natim]

I wonder if we shoudn't do the same for 409 Conflict

[n1k0]

Yes, probably.

[leplatrem]

We already have a details field in error responses, so it makes sense to use it for 412.

AFAIK it is already present on 409, see http://cliquet.readthedocs.org/en/latest/api/errors.html#conflict-errors

Since this is something that concerns the protocol, it will be implemented in Cliquet.

[Natim]

👍