Hello, we're observing an issue with Prefect Artifacts and mapped tasks after update to 0.15.6, any ideas how to resolve 🙏 ?

Hi @Lukas N., what is the issue?

this issue is related to https://prefect-community.slack.com/archives/CL09KU1K7/p1634635485031900. We're using the Artifacts beta feature and it broke when we updated to Prefect 0.15.6, also tested on latest 0.15.7, it was working before.

from prefect.artifacts import create_markdown

import prefect
from prefect import task, Flow

@task
def foo(param):
    create_markdown(f'Task {prefect.context["task_full_name"]}: {param}')

with Flow(
    'test_artifacts',    
) as flow:
    foo('unmapped') # <-- this works
    foo.map([1, 2, 3]) # <-- this doesn't

if __name__ == "__main__":
    flow.register(project_name='test')

I'm running the flow locally from UI (

prefect server start

+

prefect agent local start --show-flow-logs

). Artifacts for the unmapped task are created fine, for the mapped task it gives

prefect.exceptions.ClientError: [{'message': '[{\'extensions\': {\'path\': \'$.selectionSet.insert_task_run_artifact.args.objects\', \'code\': \'constraint-violation\'}, \'message\': \'Not-NULL violation. null value in column "tenant_id" violates not-null constraint\'}]', 'locations': [{'line': 2, 'column': 5}], 'path': ['create_task_run_artifact'], 'extensions': {'code': 'INTERNAL_SERVER_ERROR', 'exception': {'message': '[{\'extensions\': {\'path\': \'$.selectionSet.insert_task_run_artifact.args.objects\', \'code\': \'constraint-violation\'}, \'message\': \'Not-NULL violation. null value in column "tenant_id" violates not-null constraint\'}]'}}}]

Is this specifically artifacts or does it affect flows without artifacts too?

It's specific to artifacts in mapped tasks only, at least what we're observing

Will ask the team to confirm there is an issue.

just tested few versions of prefect on the ☝️ example,

0.15.4

works

0.15.5

doesn't

I opened it here

thanks