Given an attachment key, how can I find the (parent) item key?

[mhucka]

I have successfully used the incredibly useful BBT json-rpc interface for a number of operations, but cannot figure out how to do the following: given an attachment key, can I find out the item key for the Zotero record that contains that attachment?

More specifically, following the naming scheme used by the Zotero devs, if I'm looking at a PDF file on disk in my Zotero storage area, and this file has a path of the form ..../storage/PPMJQGRI/file.pdf, the folder name PPMJQGRI is the "attachment key". Using Pyzotero, it's possible to look up the parent record key, which I do in a program I wrote called Zowie. Now I'm trying to see if I can use BBT to get this information instead of using Pyzotero.

It seems like BBT has everything needed, but I can't find a suitable rpc endpoint to make it work. The closest I can come is to export the entire database in (say) "jzon" format and then look for the file in the result, but this is much too slow. Is there a more direct way?

[mhucka]

Update: I tried one more thing, and it actually worked for a limited case: if I use the item.search json-rpc endpoint, and use the attachment key (i.e., folder name) as the search term, BBT returns the record if the attachment key is something in my personal library and not a group library. This is half-way there and I'm happy to have found this much. So my question is now reduced to the following: can I search with an attachment key in shared/group databases too? Update: no, that's not true. I must have accidentally used an item key instead of an attachment key when this happened. Ignore this comment.

My original question stands as-is.

[retorquere]

No problem. If you open an issue, I'll get you an endpoint; it needs to be on an issue as I can only drop test builds there.