Hey guys, I'm Diogo and using Prefect for the first time and already in love with it ❤️ . I'm doing a Flow calling another registered flow with

StartFlowRun

, but I can't get results from that flow. Looking at the code,

create_flow_run

ignores result arg: https://github.com/PrefectHQ/prefect/blob/96ef85470872593268c9498b57ac9f0b5a268e01/src/prefect/tasks/prefect/flow_run.py#L160 Do you know a way to get Flow results? Here a test code:

from prefect.tasks.prefect import StartFlowRun
from prefect import Flow, task
from prefect.engine.results.local_result import LocalResult

graph_building = StartFlowRun(
      flow_name="test_flow",
      project_name="test_project",
      wait=True,
      result=LocalResult(".")
)
with Flow("Call Flow") as flow:
    end_flow = graph_building()

state = flow.run()
state.result[endflow].result #nothing here

Hey @Diogo Munaro, Welcome! 😄 Currently, the StartFlowRun only returns a Flow Run Id. We’re thinking more closely about how to return results back between flows. At this time, you’d have to upload the data you wish to pass to a known place and pull it into the parent flow from there.

Thank you @Dylan! I was searching but I didn't found the issue... I believe that the documentation is a bit confusing about this behavior: https://docs.prefect.io/api/latest/tasks/prefect.html#startflowrun

wait

argument said that

if True, this task will wait until the flow run is complete, and then reflect the corresponding state as the state of this task.

, but state is not the same of the Flow triggered

So it does take on the State (i.e. Success, Failed) but it does not reflect the state result

🤔 but State here is not a full State object... do you know where is this issue?

the issue you’re running into is that, at this time, we don’t return a State Result

I know, but do you know about a Github issue for that?

Ah! My apologies one second

Another issue... for me

wait

is always waiting task and returning result instead of task ID... Do you know something about that?

Could you explain what you mean by that?

wait

as an argument to

StartFlowRun

still?

These 2 slices of code returns the same:

from prefect.tasks.prefect import StartFlowRun
from prefect import Flow, task

graph_building = StartFlowRun(
      flow_name="test_flow",
      project_name="test_project",
      wait=True
)
with Flow("Call Flow") as flow:
    end_flow = graph_building()

state = flow.run()
state.result[endflow].result #nothing here

and

from prefect.tasks.prefect import StartFlowRun
from prefect import Flow, task

graph_building = StartFlowRun(
      flow_name="test_flow",
      project_name="test_project",
      wait=False
)
with Flow("Call Flow") as flow:
    end_flow = graph_building()

state = flow.run()
state.result[endflow].result #nothing here

I was expecting that second one should return only execution id