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Helper V
Helper V

CDS & GroupBy maniplates collections?

Hey there


So I've been playing around with CDS as so far I'm not really convinced. At this time, I'd rather stick to SharePoint as a data source as it seems more reliable. However - and this is probably more likely - I might be doing something wrong.


I have created an entity called "Transactions". All the fields in this entity are text fields.


My problem is the following:

On App.OnStart I'm executing the following commands:


1) ClearCollect(colTransactions, Transactions);


So far so good. When I check the colTransactions collection I can see all data the way they should be. However, I'd like to group those transactions by month. That's why I'm adding the second command to the App.OnStart:


2) ClearCollect(colMonthsGrouped,GroupBy(AddColumns(Filter(Transactions,'Transaction Type' = "Expense"),"Month",Text('Transaction Date',"[$-en-US]mmmm")),"Month","Transactions"));


Once I do that, my colTransactions collection is being manipulated and loses the value for some of the fields. E.g. "name" or "category"


See before and after: 



Anyone knows why this is happening?

Super User
Super User

Hi @mrQ 

I was also playing around with your formulas and found something interesting that I could not explain.  When I tried to reproduce your issue using a collection obtained from the formula on the button as the Items property of the outer gallery, I got a null set as shown in the gallery on the left.  However, when I used 


            'Order Date',


 as the items property of the outer gallery and Transactions as the Items property of the inner gallery, it worked perfectly as shown in the gallery on the right.  I'm not sure why the collection didn't work.

Annotation 2020-05-22 104824.jpg

Ok, I tried again and it worked. I used GroupBy(colOrders,"Month","Transactions") as the Items property for the outer gallery and Transactions as the Items property of the Inner gallery. The formula for the collection is in the button.Annotation 2020-05-23 091753.jpg

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