(Prefect 2.0 question) my flow has a

start_date

parameter. In the flow code the default of this value is set like this

def sync_circleci(start_date: datetime.date = datetime.datetime.today().date()):
   ...

and it will come out in the YYYY-MM-DD format. Now when I deploy the flow, it seems that the default value is not recognized by Prefect UI. When I run this flow "using default param values", the flow fails with this error

prefect.exceptions.SignatureMismatchError: Function expects parameters ['start_date'] but was provided with parameters []

which means the default value is not recognized (?). And when I select a date value using the date picker, looks like the date format is not recognized by my flow code with this error

- start_date: invalid date format

How should I handle this?

thanks for flagging - we are currently investigating and will let you know once we know more

Hi @Ha Pham - for your question about setting parameters in the UI - I've opened an issue to look into the datetime.date setting. Would datetime.datetime work for you in the meantime?

ok I will try it out, thanks

FYI: we'll ship a fix for that with a 2.1.1 release within the next hour or so

thanks Anna. I have also tried to change the input data type to datetime. the flow now works when I trigger it with a param override.

def sync_circleci(start_date: datetime.datetime = datetime.datetime.now(pytz.utc)):

However it still does not recognize the default value

Hi @Ha Pham - have you updated to Prefect 2.1.1?

no not yet, I'm still at 2.1.0

Ah - for default parameters to work you'll need to make the update!