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Moises
Helper I
Helper I

[DELEGATION] SHAREPOINT LIST FAIL

Hi All,

 

Before anything, i read, read again and read again this document's:

 

https://powerapps.microsoft.com/en-us/tutorials/delegation-overview/

https://powerapps.microsoft.com/en-us/tutorials/delegation-list/

 

Maybe I haven't interpreted it correctly. But i used this formula in a SharePoint List:

 

Filter(RegistroPagamentos;ALUNO.Value = GALLERY_1.Selected.NOME)

 

 

SharePoint List is a Delegation Datasource;

Filter is a Delegation Function;

This operator = (only string) is a Delegation operator and yet i receive blue-dot suggestion and my application can't list all records (limited in 500 row's)

 

help-me

14 REPLIES 14

Problem becomes that AddColumns is not delegable. Smiley Sad

 

When used with a data source, these functions can't be delegated. Only the first portion of the data source will be retrieved and then the function applied. The result may not represent the complete story. A blue dot will appear at authoring time to remind you of this limitation and to suggest switching to delegable alternatives where possible.
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That's interesting because I just wrote this function and it does not warn about delegation at all.

CountRows(
    ShowColumns(
        Filter(
            AddColumns('Errors', "RowStatusValue", 'Error Row Status'.Value),
            'Original Sales Order Number(s)' = ThisItem.'Original Sales Order Number(s)',
            'Customer Code' = ThisItem.'Customer Code',
            RowStatusValue = "Reviewed"
        ),
        "Original_x0020_Sales_x0020_Order"
    )
)

Are you working with a large list?  I don't believe the delegation warning comes up on it, but if it is a large list, the results will be incorrect.

At least that is what I have experienced with large lists and the AddColumns...just what the docs say.

Our only true solution to large lists is pre-loading them in a collection (this can sometimes be a challenge) and then filtering, and so forth on just that local list.

Makes you really think through the lists you have and how they will grow.  Last thing you want is "it was working before and now it's not" - only to find that the list grew beyond the limits.

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Ugh. I agree that the documentation is pretty clear that the AddColumns is not delegable, but I can confirm that with my list (a few sharepoint items) it does not warn.

 

This makes me really nervous about the platform as a whole.

 

Maybe it's because I'm working with sharepoint as a data source, but I would say that understanding delegation and the work arounds for various scenarios has been the biggest challenge to implementing power apps solutions.

I feel that pain!  We primarily use SP as a data source as well and we constantly have to think that through. 

I wish they could implement a SharePoint View as a data source.  That would at least pre-filter lists based on the View settings.  That would not solve the issue, but it would go a LONG way to helping.

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