How to check if a list of dates conflicts with a list date ranges?

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Posted on by apsuk

I have a Table called DaysToStore. It contains a field called Day that the user has picked.

There is also a Bookings Table, which has 3 fields, a unqiue BookingId, ReservedFrom and ReservedUntil.

I want to set Button1.OnSelect to create a new version of DaysToStore, with an added field called Clash.

For each record the value of Clash is either true or false if the Day >= ReservedFrom and Date <= ReservedUntil.

Here is my attempt but it doesn't work, and of course PowerApps is pretty bad and indicating why this might be...

ClearCollect(
NewDaysToStore, AddColumns( DaysToStore, "Clash", LookUp(Bookings, And(Day >= ReservedFrom, Day <= ReservedUntil), true)) 
)

Do you have any suggestions?

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Building Power Apps

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Community Power Pla... Microsoft Employee on at

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I've put together a test on my end and your code is working fine. Double check that DaysToStore.Day, Bookings.ReservedFrom, and Bookins.ReservedUntil are all date types. You can use DateValue() to ensure they are stored as dates.
ClearCollect( NewDaysToStore, AddColumns( DaysToStore, "Clash", LookUp(Bookings, And(DateValue(Day) >= DateValue(ReservedFrom), DateValue(Day) <= DateValue(ReservedUntil)), true)) )
yashag2255 24,769 Super User 2024 Season 1 on at

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Hi @apsuk

You can avoid usage of collection in this case by using the below formula:

If(CountRows(Filter(Bookings, And(Day >= ReservedFrom, Day <= ReservedUntil))) = 0 ,"false","true")

false means that there is no clash but true means that there is a clash.

Hope this Helps!

If this reply has answered your question or solved your issue, please mark this question as answered. Answered questions helps users in the future who may have the same issue or question quickly find a resolution via search. If you liked my response, please consider giving it a thumbs up. THANKS!
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v-xida-msft Microsoft Employee on at

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Hi @apsuk ,

Could you please share a bit more about your scenario?

Do you want to add a new Clash field with true or false value to your new DaysToStore table?

Based on the formula that you mentioned, I think there is something wrong with it. I have made a test on my side, please consider take a try with the following formula:

ClearCollect( NewDaysToStore, AddColumns( DaysToStore, "Clash", If( !IsBlank(LookUp(Bookings, Day >= ReservedFrom && Day <= ReservedUntil)), true, false ) ) )

Please consider take a try with above solution, then check if the issue is solved.

Best regards,