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yukonn
Advocate III
Advocate III

How do I iteration on Collection?

Hi,

 

       I need to use "For, Do..While, While" base on requirement. But i do not see any formula or function for my requirement. how may i loop on collection?

 

Regards,

Yukon

1 ACCEPTED SOLUTION

Accepted Solutions
Steelman70
Power Participant
Power Participant

Understood. Here is what I would do:
1) Check if the custom connection supports bulk operations (i.e. write/delete multiple records)
2) If not, check if you could use one of the standard connections instead of a custom API
3) If not, see if you could change your user interface to perform operations with the Add to card button, saving the previous version in a collection. Then you can change this same button's text to Remove from card and return the old version if selected
4) If all of the above do not work then there is this hack: use a timer control. You can set context variable i to 1 and start the timer on pressing the confirm button, do your update/insert operation on timer start then update a context variable i = i+1 on timer end and have the timer repeat while i <= countrow. Set the timer duration to as low a value as will work. You can even hide the timer control.

This last suggestion is a bit messy, which is why it is not first, but I have made it work in a similar situation. Please let me know if you get stuck.

View solution in original post

10 REPLIES 10
Steelman70
Power Participant
Power Participant

Hi, can you please provide a little more detail on what you need to do? There are a few alternatives depending on the situation.

Hi,

 

        Thank for your reply.

        Let say, i have one collection and we call it collSalesLine. The collection structure is Table{DocNo: xxx,DocLineNo: xxxx,ItemNo:xxx,Qty:xxx,UoM:xxxx}. The data will be save collSalesLine when user select the item and press the button (Add to Card). I want to pass those sales lines inside of collSalesLine to my web service (OData) when the user press confirm button.

 

PSEUDOCODE

WHILE i < CountRow(collSalesLine)

      IF FOUND THEN

           DO UPDATE

      ELSE

           DO INSERT

ENDWHILE

 

Regards,

Yukon

Thanks for clarifying.  I can suggest that with the confim button you delete all matching web service records and then insert all records from the collSalesLine.

If this could work, I would suggest the following pseudocode for the OnSelect property of the confirm button:

 

ClearCollect(collSalesLineFOUND, Filter(collSalesLine, FOUND)); Remove (OData, collSalesLineFOUND, All); Collect (OData, collSalesLine)

 

Where FOUND is the expression where you identify the records that are already in the OData.

 

Please let me know if this could work or if there are other issues to be resolved or if you need more details.  In particular if you necessarily need to update the existing records instead of removing and inserting (collecting) new ones as I suggest above.

 

 

PS This could also work but would be more difficult to debug:

 

Remove (OData, Filter(collSalesLine, FOUND), All); Collect (OData, collSalesLine)

Hi,

 

        Thank for your suggestion. You mention to use Collect (OData, collSalesLine) for update back to OData. I may not sure my OData is working with this way. Because My odata Customer API must be pass the value as parameter.

 

WHILE i < CountRows(collSalesLine)

      CustAPI.ODataPostSalesLine({$DocNo: collSalesLine.DocNo,$DocLineNo: collSalesLine.DocLineNo,$ItemNo: collSalesLine.ItemNo,$Quantity: collSalesLines.Qty,$UoM: collSalesLines.UoM})

ENDWHILE

 

Add Infor for loading OData to collSalesLine

      Collect(collSalesLine,CustAPI.ODataGetSalesLine().value);

 

Please share to me if you have another idea.

I'll test as you suggest method as well.

 

Regards,

Yukon

Steelman70
Power Participant
Power Participant

Understood. Here is what I would do:
1) Check if the custom connection supports bulk operations (i.e. write/delete multiple records)
2) If not, check if you could use one of the standard connections instead of a custom API
3) If not, see if you could change your user interface to perform operations with the Add to card button, saving the previous version in a collection. Then you can change this same button's text to Remove from card and return the old version if selected
4) If all of the above do not work then there is this hack: use a timer control. You can set context variable i to 1 and start the timer on pressing the confirm button, do your update/insert operation on timer start then update a context variable i = i+1 on timer end and have the timer repeat while i <= countrow. Set the timer duration to as low a value as will work. You can even hide the timer control.

This last suggestion is a bit messy, which is why it is not first, but I have made it work in a similar situation. Please let me know if you get stuck.

Hi,

 

1) Check if the custom connection supports bulk operations (i.e. write/delete multiple records)

  - Not support for multiple records Smiley Sad


2) If not, check if you could use one of the standard connections instead of a custom API

  - does not exist std. connection. may be coming soon but not sure.


4) If all of the above do not work then there is this hack: use a timer control. You can set context variable i to 1 and start the timer on pressing the confirm button, do your update/insert operation on timer start then update a context variable i = i+1 on timer end and have the timer repeat while i <= countrow. Set the timer duration to as low a value as will work. You can even hide the timer control.

   - I need to use this method. Personally i don't like this method.

 

Thank for your best suggestion. I'll request to add Iteration to MS PowersApp Team.

I need to try 1st method.

 

Regards,

Yukon

hpkeong
Community Champion
Community Champion

Hi

 

Just saw your thread.

I have shared Autosaving method using iteration.

Just sharing in case you need it.

 

 Capture.PNG

 

hpkeong

Hi,

 

        Thanks for sharing. If i have any issue, i'll let you know again.

 

Regards,

 

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