hi guys when i do ```def container p return CreateContainer

Question

hi guys when i do ```def container p return CreateContainer image name= image command=f p= p start = StartContainer with Flow flow as flow p = Parameter param required=True c = container p start container = start container id=c ``` i get ` lt Parameter p gt ` interpolated for `p` instead of the actual value for p but if i make `container` a ` task` it also gives weird errors i think because `CreateContainer` is itself already a task

sark · Answer

i am just trying to do <https docs prefect io core examples functional docker html docker pipeline functional api>

sark · Answer

but with parameters

sark · Answer

this seems to require dependent tasks as `CreateContainer` depends on the output of `Parameter`

sark · Answer

which seems a little overkill given that i simply want to parametrise my flows not perform any sophisticated dynamic DAG shenanigans

sark · Answer

ok it works when i define `start` instead like this ``` task def start i return StartContainer container id=i ``` and add ` task` to `container` also

sark · Answer

works but feels like i m jumping hoops or working against the grain of prefect somehow

sark · Answer

no actually it doesn t work ```Unexpected error ValueError Could not infer an active Flow context Traceback most recent call last File usr local lib python3 8 site packages prefect engine runner py line 48 in inner new state = method self state args kwargs File usr local lib python3 8 site packages prefect engine task runner py line 822 in get task run state value = timeout handler File usr local lib python3 8 site packages prefect utilities executors py line 188 in timeout handler return fn args kwargs File crdf py line 65 in start File usr local lib python3 8 site packages prefect core task py line 475 in call new bind File usr local lib python3 8 site packages prefect core task py line 528 in bind raise ValueError Could not infer an active Flow context ValueError Could not infer an active Flow context ``` because it should have been `StartContainer container id=i `