Hello I am running into what seems like a simple problem but

Question

Hello I am running into what seems like a simple problem but not seeing how to do it I have an implicit dependency from taskC to taskD but can t get prefect to understand it

Adam Roderick · Answer

Here is the code to repro ```import prefect prefect task def taskA return output from A prefect task def taskB input return f output from B input prefect task def taskC input return f output from C input prefect task def taskD input1 print f recieved input1 input1 with prefect Flow test flow as flow outputA = taskA outputB = taskB outputA taskC outputA taskD outputA taskC set dependencies downstream tasks= taskD flow run ```

Adam Roderick · Answer

When I include the line `taskC set dependencies downstream tasks= taskD ` the DAG is

Adam Roderick · Answer

But when I comment that line there is no dependency from C to D

Kevin Kho · Answer

You can do ```with prefect Flow test flow as flow outputA = taskA outputB = taskB outputA x = taskC outputA taskD outputA upstream tasks= x ``` or ```with prefect Flow test flow as flow outputA = taskA outputB = taskB outputA x = taskC outputA y = taskD outputA y set upstream x ```

Adam Roderick · Answer

Thanks Method 1 worked method 2 resulted in a TriggerFailed

Kevin Kho · Answer

uhhh that s very weird a triggerfailed would mean `taskC` failed

Adam Roderick · Answer

yeah I don t know what would have failed but that s what prefect reported In any case Method 1 is working great Thank you very much