Power Apps Button to Update Sharepoint List item

[FureYang]

what is the recommended ways to update an item in Microsoft List (a predefined number) by reducing it by X number for every Power App Button press.

let say i have 100 unit and every Button Press will reduce it by 1

[CNT · Accepted solution]

@FureYang use the Patch function. Patch(listName, recordToUpdate, {value:existingValue-1})

[FureYang]

Hi @CNT, Alright will try it out .... THX!

[FureYang]

I have tried to edit as such:

OnSelect: fx= Patch(NumberControlTest,ThisItem.Quota,{Value:ThisItem.Quota-1})

But it seems that the formula have errors. likely defined incorrectly for "{Value:ThisItem.Quota-1}" part.

[CNT]

@FureYang can I see a screen shot with the error?

[FureYang]

The app is to update a Microsoft List item. So i was intended to make a button to update the Quota Column as I select the Button.

[CNT]

@FureYang I see only the red lines but not the Error Message! Hoover over the red line to see the error message. Also, what is the data type of the Quota column?

[FureYang]

Sorry about that. 
Here is the error message: Invalid argument type (Number). Expecting a record value instead.

The Column is defined as a number by the way.

[CNT]

@FureYang The Value column in NumberControlTest is expecting a record. I'm not sure what is the structure of this? Can you provide all the details please?

[FureYang]

Sure. I'm trying to create an App out of Microsoft List.
So the list looks as such:

Then Integrate it to Power Apps.

Then, from the Edit Form page, i am trying to insert a button for the Quota item to update its value.