Hey community! Is there a way to run a flow inside a different flow? I mean suppose I have an existing flow and want to trigger it as part of a different flow, without specifying the flow again. Is there a way to do that? e.g. a Task that wraps an existing flow? Preferably a flow that is registered to the orchestration server?

Hi @Avi A! If I'm understanding properly, you want to kick off a new flow run from within a flow. While I wouldn't recommend wrapping an existing flow in a task (things can get wonky that way), you can use your orchestration layer to use the Flow Run Task and kick off a new flow run. https://docs.prefect.io/api/latest/tasks/cloud.html#flowruntask

got it, thanks. so I understand this functionality works only with cloud, and not with the core server?

Actually, I think you've spotted a chance for us to improve our documentation! Looks like the docs I linked are pre-server, but I just tested and you can use the

FlowRunTask

with server as well. It's worth noting that you won't want to provide a project name if running this with Prefect Server as your orchestration layer eg

fr_test = FlowRunTask(flow_name="hello-flow")

thanks a lot, I’ll give it a go soon!

Sounds good! I'm a fan of this task-- hope you are too. 🙂

thanks for following up! actually looking deeper into the doc and the source code it seems that this task only triggers the flow, but doesn’t wait for it

That's correct-- it'll send an API call to your orchestration layer to create a new, scheduled flow run, but will not wait for that flow run.