Bring your towel and join one of the fastest growing data communities. Welcome to our second-generation open source orchestration platform, a completely rethought approach to dataflow automation.

Prefect Community

Hi all-- I am evaluating Prefect (Orion) and had a question. What is the best way to dynamically trigger a scheduled flow run at a specified time? I have a nightly flow that picks up a start time from an API, and I'd like to have it then schedule a different flow to run at that time (only once though). Thanks for any help

You need to use the `client.create_flow_run_from_deployment` <https://discourse.prefect.io/t/how-to-create-a-flow-run-from-deployment-orchestrator-pattern/803|here> , and then pass a <https://orion-docs.prefect.io/api-ref/orion/schemas/states/#prefect.orion.schemas.states.Scheduled|Scheduled> state with the scheduled datetime to that call

This is helpful, thanks Kevin. Just going through these docs, could I just use `client.create_flow_run`  and pass it the `flow_id` and `scheduled_start_time` ?

Could you show me what you are looking at?

Oooh I think I accidentally landed back in v1
<https://github.com/PrefectHQ/prefect/blob/f3c8b8150897997372339a4690a2de055fd40717/src/prefect/client/client.py#L1135>

But basically this interface looks like exactly what I need I think

I see now what you were saying-- so I would use this

<https://orion-docs.prefect.io/api-ref/prefect/client/#prefect.client.OrionClient.create_flow_run_from_deployment>

with `state=Scheduled(start_time=start_time)`

Ah yeah that is for Prefect 1. Yes the API is different between the two. It will be easier in Prefect 1 for now it seems