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Calculating number of items and increase value in another list

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Posted on by Genny

Hello, team.

I have two lists in sharepoint, in one of them people are booking accomodations, but accomodation can contain few peoples and I should get possibility to choose only frees accomodation.

So, as I understand, I should create a lookup column that will be see a date for each column from now to now+1 month and added 1 to column with TotalPeople@Accomodation. After that Power Apps can show in dropdown list accomodations with TotalPeople<MaxPeople only.

That's right? If it is, can I do that in Flow, or I can use some sharepoint instruments?

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v-yamao-msft on at

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Hi @Genny,

Could you share more details on the two lists?

To calculate number of items in a list, we could use function length to return the number of items in a collection.

A simple flow for your reference:

Best regards,

Mabel

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Genny 2 on at

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So,

I have one list, that contain next columns:
Created By
Date of Arrival
Date of Departure
City of Arrival
Accomodation for booking

Another list contains:
City
Staff
Current number of people at accomodation
Maximum allowed people at accomodation

What I want to do:
When someone create an Item in first list, in dropdown list them can see only Accomodations that can satisfy two conditions:
1. Accomodation are belong to city that was choosed in previous dropdown list in same form.
2. Accomodation are have at least one free place (that mean current number of people for all dates between date of arrival and date of departure less than maximum allowed number of people for that accomodation).

So, looks a bit complicated, but I think I can explain all what I want.
Of course, that feature should work continiously, updating one time in a day or when anybody adding/deleting item.
I found something similar in powerapps theme (https://powerusers.microsoft.com/t5/General-Discussion/Check-Date-Availability-for-a-Sharepoint-item-and-then-change/m-p/42729#M17710), and for now looking for most optimum solution.

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