Error when trying to get a unit by id with olca-ipc

Question

Hi,

When I do this :

> unit_ref = client.find(olca.Unit, "kg")
> unit = client.get(olca.Unit, unit_ref.id)

I get a "500: Conversion to JSON failed". This is not the case with other types, like UnitGroup.

I tried to debug printing requests responses but without success.

Answer 1

Correct, the `get` and `find` methods currently only work with stand-alone entities. Stand-alone entities are basically the things that you can find in the navigation tree of openLCA. As a unit is always part of a unit group it is not a stand-alone entity. You should be able to get it via the unit group:

>>> import olca

>>> client = olca.Client(8080)

>>> group_ref = client.find(olca.UnitGroup, "Units of mass")

>>> group = client.get(olca.UnitGroup, group_ref.id)

>>> kg = [u for u in group.units if u.name == "kg"]

>>> kg

[<olca.schema.Unit object at 0x000001A2672D7070>]

However, getting a unit via the IPC client would be of course useful. I added an issue for this on the IPC repo: https://github.com/GreenDelta/olca-ipc.py/issues/4

Comments

Thanks for the answer and the created issue, the code you provided is what I did myself :)