Cannot use folder-name field to filter resources in HP QC REST API - rest

Question

I don't expect to get an answer on this but if anyone can help it would be greatly appreciated.
We're using HP Application Lifecycle Management 12.2 (ALM or QC/QualityCenter as it's called). I'm trying to retrieve test resources from the project using the REST api but I suspect I've come across a defect in the API.
I'm trying to filter the response by using a query, and any other query works fine but when I try to use the 'folder-name' field it fails with the following message:
Failed to set params in the parametrized query
It doesn't matter what format I try to escape the query with, I've tried the following:
/resources/?query={folder-name[%27folder%27]}
/resources/?query={folder-name['folder']}
/resources/?query=%7bfolder-name%5b%27folder%27%5d%7d
I've also reproduced this on an 11.52 QC instance so it's not just our environment. I've double checked the customization collection using the ?can-filter=true param and folder-name is supposed to be filterable.
I'm currently using the parent-id for filtering instead which works but it requires me to do another request to get the parent-id first which I would like to refrain from.
Any suggestions, patches?
Thanks

Answer 1

As I wrote in the comments, the error is reproducable here, and I agree that it is strange. The folder-name exists as a field in resource, and should be filterable. It seems to be a bug.
But there is another approach that I offer as a substitute solution. The resource entity offer a relation directly to the folder entity, and you can get the exact result you were looking for, by using a cross join with that table:
/resources/?query={resource-folder.name['folder']}
This is probably too late to help you with your work, but it might help others.