Redmine

I'm trying to figure out the syntax for updating an issue via the REST API. In my case, I'm trying to update the custom fields via JSON, specifically an integer field named "Order". Unfortunately, the Rest_Issues wiki page doesn't include this information, or at least it isn't very obvious, and I haven't been able to find the information anywhere else.

Using curl and Redmine 1.1.1, my attempts so far include:

PUT /issues/8.json
{"issue":{"custom_fields":[{"id":"4","name":"Order","value":5}]},"key":"..."}
...
HTTP/1.1 422 Unprocessable Entity
{"errors":[["custom_values","is invalid"]]}

Another attempt:

PUT /issues/8.json
{"issue":{"custom_values":[{"id":"4","name":"Order","value":5}]},"key":"..."}
...
HTTP/1.1 200 OK

however, the custom field is not updated. I also got the same response when I replaced "custom_values" with "blahblahblah".

After looking at the code (source:/tags/1.1.1/app/views/issues/index.api.rsb#L22 and source:/tags/1.1.1/app/helpers/custom_fields_helper.rb#L109), I tried:

PUT /issues/8.json
{"issue":{"custom_field_values":[{"custom_field_id":"4","custom_field":{"name":"Order"},"value":5}]},"key":"..."}
...
HTTP/1.1 500 Internal Server Error
... please contact your redMine administrator for assistance ...

I'm not sure if this is a bug or not, but either way, I think the Rest_Issues page could use more complete information.

Has anyone been successful in updating custom fields using the API?