Hi all, I am experimenting with tasks and subflows in prefect 2.0. While in tasks I can use the wait_for keyword to enforce task dependency, the same keyword does not work for subflows. I did not found much on the subflows docs, but it seems that in prefect 1.0 dependency between subflows was possible. Is such a feature available also in prefect 2 ?

This just hasn’t been added yet

Thanks for the quick reply @Zanie. If I understand correctly, using wait_for in a task also injects a "logical dependency" not only a temporal ordering. For example, in the following

@task
def task_a():
    pass

@task
def task_b():
    pass

@flow
def my_flow():
    a = task_a()
    b = task_b(wait_for=[a])

if task_a fails, task_b does not execute, right? I am looking for a similar dependency between subflows or a subflow depending on a task

Ah yes, I see your point. You can pass the task futures to the subflow directly but when you do not want to add a data dependency this introduces a problem

I think this will work. Many thanks for your help @Zanie

@Marvin open “Add

wait_for

for flows”