Hi everyone! I am using .map() to run a task with a list as parameter, but I do not get a desired behaviour. For example, if I specify a parameter as:

markets = Parameter('markets', default=['stockholm', 'oslo'])

And then run a function:

total_df = load_data.map(
    city=markets,
    date_from=date_from
)

where I pass a single value parameter, date_from, and my list parameter markets. Everything runs without error, however, the function is only run for the first value in the markets list. What I want is to run for each value in markets, using the same value of date_from for each element in markets. How can I achieve this?

Hey @Samuel Tober - good question and good use of Prefect Map feature! For constant value in mapping, you can utilized the

unmapped

method in Prefect: https://docs.prefect.io/core/concepts/mapping.html#unmapped-inputs

Awesome, works like a charm! Thanks for the quick response

Glad to hear!