merge on empty Entity List gives 409 error related to properties

[lognaturel]

A user reports attempting to run client.entities.merge(entities_list, entity_list_name='my_entities', project_id=1, match_keys=None, add_new_properties=True, update_matched=False, delete_not_matched=True, source_label_key='label', source_keys=None,create_source=None, source_size=None) and receiving 409 errors. Each time they ran the call, they got a 409 on a different property.

When they added an Entity to the list, the call started working as expected.

I haven't investigated yet. This could possibly be a Central issue but I suspect it's something pyodk should handle .

[lindsay-stevens]

Per @lognaturel 2025-02-11 via meeting: Merge should support initial creation without any entities, rather than always assuming entities will be added at the time. So that users can call merge at to initiate and then maintain a pipeline.

[lindsay-stevens]

@lognaturel are there any more details on how this was triggered or what the 409 error said? I had a look at this and there's an existing test case that seems to cover this scenario.

test_entity__merge__new makes a new empty entity list and merge is used to create 2 entities with a non-label property each. I also tried setting the optional parameters as shown above but that didn't reproduce any errors either.