How to use non-default parameters when submitting a Workflow

[rgasper]

Argo allows submitting a workflow with parameters set to non-default values: https://argo-workflows.readthedocs.io/en/latest/walk-through/parameters/

How can you do this with Hera? I looked through most of the Workflow and WorkflowsService source code and don't see anything about parameters at submit time. The obvious place seems to me to be at workflow.create(parameters=parameters) but .create does not have a parameters argument.

I've got a solution that works by using a factory function to take my parameter inputs and generate a brand new workflow with those inserted as the default parameter values, but that seems silly.

[elliotgunton]

Hi @rgasper! At the moment the way to this is to set the values by the arguments on the Workflow. E.g. if you have a workflow like

# my_workflow.py
from hera.workflows import Workflow, script


@script()
def hello(s: str):
    print("Hello, {s}!".format(s=s))


with Workflow(
    generate_name="hello-world-",
    entrypoint="hello",
    arguments={"s": "world"},
) as w:
    hello()

Then you can import it and do

# submit_script.py
from my_workflow import w

w.arguments = {"s": "Hera"}
w.create()

I think adding an arguments parameter to the create function makes sense though to make this use case a one-liner (actually this should accept most if not all the Workflow attributes, then you could also set entrypoint on the fly). Feel free to create a feature request for that! 🚀

[rgasper]

Thanks!