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Union function not working as expected

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Posted on by Bee1

Hello,

I am trying to extract unique dates from a filter array of dates using compose action with union function but encountered the following error:

I checked the expression but unable to spot any problem with it. Much appreciate any help to troubleshoot this issue. The union expression I used is

union(outputs('Compose_2__-__Get_Booking_Dates_'),outputs('Compose_2__-__Get_Booking_Dates_'))

Thanks in advance for your help.

@ekarim2020

@reza dorrani

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Pstork1 68,707 Most Valuable Professional on at

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Union() is designed to work on arrays and you are feeding it a string date. What does your Compose 2 formula look like? It should be an array of dates, but it's evidently returning a string.

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Bee1 21 on at

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Hi, Pstork1

Thanks for the quick response. Compose2 formula is as follows:

body('Filter_array_EXCEPT')[0]['BookingDate']

Filter array Except is filtering a SharePoint lists of booking dates that is not in another list.

The output of Compose 2 is as shown below:
I need to get the unique booking dates. I need to get unique dates to create item in another list. Therefore I used the union function. But actually it looks like the Compose2 is showing 1 date although the Filter array Except identify 17 exceptions of the same booking dates. Therefore second Compose with union function is not needed? Appreciate if you can advise.

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Pstork1 68,707 Most Valuable Professional on at

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The problem is that your Compose is selecting just the first record of the array, you have specified the index [0]. So you are passing a string value to the Union(), not an array. I think what you want to use for the Union is the output of the filter array, not the compose.

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