Hey there is this possible I want to default out another par Prefect Community #ask-community

Hey there, is this possible? I want to default ou...

Mitchell Bregman

01/14/2021, 4:19 PM

Hey there, is this possible? I want to default out another parameters based on a previous parameter. In this example, let’s say

is a string and I want to

.lower()

it.

Copy code

flow = Flow("some flow")
with flow:
    x = Parameter("x")
    y = Parameter("y", default=x.foo())

The use case I will be doing this for is date specification and building dynamic dates based on a main driving parameter

Zanie

01/14/2021, 4:26 PM

Hmm, parameter values need to be serializable so I don’t think you can set a default that’s dependent on a runtime value like this.

Zanie

01/14/2021, 4:27 PM

Is there a case where you’d want the user to be able to configure

independently of

? If you want to have

be based on

you can just use a normal task

Mitchell Bregman

01/14/2021, 4:30 PM

yeah, thats what I will end up doing

Mitchell Bregman

01/14/2021, 4:30 PM

thanks so much, was just curious

Mitchell Bregman

01/14/2021, 4:31 PM

but yes, there is a case where

can be independent…. i will just have some handling around that

Mitchell Bregman

01/14/2021, 4:31 PM

and default

to None

Zanie

01/14/2021, 4:31 PM

No problem! It’d be cool if we could take callables there but since we need to display defaults in the UI and such it becomes a bit of a security concern to execute the code on our end.

Zanie

01/14/2021, 4:32 PM

@Jim Crist-Harif — perhaps a possible use-case for the “secure execution” model 🙂

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