Hey all slightly smiling face We got the following error whe

Question

Hey all slightly smiling face We got the following error when trying to map over a list of dictionaries First just to clarify mapping over a list of dictionaries should be fine right Second what could be the reason for the message

Jim Crist-Harif · Answer

Hi Robin mapping over a list of dictionaries should be fine The error you re getting here is happening in your task here the actual mapping appears to be working correctly looks like you re getting a list where you expected a dict perhaps you re passing in a list of lists instead

Robin · Answer

Good point Thanks for the quick feedback slightly smiling face

Robin · Answer

In that case this should work right ```reduce list = task lambda list of lists reduce list extend list of lists ```

Robin · Answer

``` task def reduce list list of lists out = for l in list of lists out extend l return out``` did the trick slightly smiling face

Jim Crist-Harif · Answer

That d work you could also make use of the new ish `prefect flatten` which will do that for you but potentially in a more efficient way ```your task map flatten list of lists ``` See <https docs prefect io core concepts mapping html flat mapping> for more info

Robin · Answer

Thanks for the tip that looks neat slightly smiling face

Robin · Answer

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