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johnjohn123
Kudo Kingpin
Kudo Kingpin

Loop thorugh a collection and issue seperate Lookup() instead of using one Filter() and get delegation warning

I have 2 SharePoint lists:-

 

1) Task list .. with these fields:-

- ID

- Title

2) PeopleWork list.. with these fields:-

- ID

- TaskID .. this should store the Task ID from the Task list in numeric format

- Single selection people/group field named People

 

 

So now i tried to create a demo gallery which should only show the Tasks where the user is assigned to. so on the Screen OnVisible i build this collection to get the PeopleWork items which have the login user email:-

 

ClearCollect(relatedtasks,Filter(PeopleWork,People.Email=User().Email))

 

 

then on the Items property of the gallery i define this formula:-

johnjohn123_0-1650300820248.png

 

 

but i also got a delegation warning..is there a way to fix this? Can i instead of using Filter on the Tasks items using this formula:-

 

 

Filter(task,ID in relatedtasks.TaskID)

 

 

which will retrieve the related Tasks items in one call, to Loop through the relatedtasks collection and for each TaskID issue a separate Lookup() to get the related Task ? and then build a collection of all the Tasks which have their Ids inside the relatedtaks.TaskID collection? so i can get all the related Tasks item without getting an delegation warning?

 

Thanks

 

10 REPLIES 10
johnjohn123
Kudo Kingpin
Kudo Kingpin

Hi All,

 

Any help of this please?

BCBuizer
Multi Super User
Multi Super User

Hi @johnjohn123 ,

 

Wouldn't it be easier to get rid of the TaskID in the 'PeopleWork list' and add an 'Assignee' column to the 'Task list'? Assuming there's 1:N relationship, it makes more sense to me to approach this from the 1 end, rather than the N end.

 

Your filter then will look something like this:

Filter(
   task,
   ID = LookUp(PeopleWork, People.Email = User().Email).ID)
)

 

 



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johnjohn123
Kudo Kingpin
Kudo Kingpin

@BCBuizer Thanks for your reply. but not sure i got your point ... the Task can have multiple Assignee and i do not want to use People/Group SharePoint column which allow multiple selection, that why i set a separate list named PeopleWork... so are you able to advice accordingly ?

BCBuizer
Multi Super User
Multi Super User

Hi @johnjohn123 ,

 

The thing is that there's no 100% workaround for the 'in' operator. In case of an N:N relationship, the only thing to do to avoid issues is to pre-filter your data with a delegable operator to get the number of items below the delegation limit.

 

https://powerusers.microsoft.com/t5/Building-Power-Apps/delegable-alternative-for-IN-operator/td-p/6...

 

Your suggestion to loop through all tasks might work, but will take a lot of resources and hence will severely impact the response time of your app.

 

 



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johnjohn123
Kudo Kingpin
Kudo Kingpin

@BCBuizer unfortunately in my case i can not achieve this  :-

 

the only thing to do to avoid issues is to pre-filter your data with a delegable operator to get the number of items below the delegation limit.

 

now last thing i will care about is performance .... at the end i want the power app to work.. so can you post some code on how i can loop through the relatedtasks collection and for each TaskID issue a separate Lookup() to get the related Task ? at the end each user might have only 1-4 tasks,,, so it will not be a big performance issue.

Thanks

BCBuizer
Multi Super User
Multi Super User

Hi @johnjohn123 ,

 

I think the code you're looking for should look something like this. It will generate a collection colUserTask:

 

Clear(colUserTasks);
ForAll(
   task,
   If(
      !IsEmpty(
         LookUp(
            relatedtasks,
            TaskID = ThisRecord.ID
         )
      ),
      Collect(
         colUserTasks,
         ThisRecord
      )
   )
)

 

 

This code needs to be triggered somehow, so you can set it in the App.Onstart or Screen.Onvisible properties. The Items property of your gallery can reference the collection directly.



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johnjohn123
Kudo Kingpin
Kudo Kingpin

@BCBuizer  you latest formula worked well for me, and i did not get any delegation warning.. so am i fine? or there are issues with this approach i am unaware of? Thanks

 

but i think the formula should be as follow , to loop through the collection not the actual list:-

 

 

ClearCollect(relatedtasks,Filter(PeopleWork,People.Email=User().Email));

Clear(colUserTasks);
ForAll(
   relatedtasks,
   If(
      !IsEmpty(
         LookUp(
            task,
            ID = TaskID
         )
      ),
      Collect(
         colUserTasks,
         LookUp(
            task,
            ID = TaskID
         )
      )
   )
)

 

 

Hi @johnjohn123 ,

 

This way around is indeed easier, and the code can even be further simplified since you won't have any records in the relatedtasks collection that don't have a TaskID:

 

ClearCollect(relatedtasks,Filter(PeopleWork,People.Email=User().Email));

Clear(colUserTasks);

ForAll(relatedtasks,Collect(colUserTasks,LookUp(tasks,ID = ThisRecord.TaskID)))

 

 

From a delegation perspective this all works fine, but as the data sources grows, so will the loading times, not to mention the work you'll have to put into keeping your collection and data source synchronised.



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johnjohn123
Kudo Kingpin
Kudo Kingpin

@BCBuizer the issue with this approach and also your previous formula also (which i realized today) , is that when i write this :-

 

ClearCollect(relatedtasks,Filter(PeopleWork,People.Email=User().Email));

i will get many duplicate TaskIds inside the relatedtasks collection.. so this will cause unnecessary calls inside the :-

 

ForAll(relatedtasks,Collect(colUserTasks,LookUp(tasks,ID = ThisRecord.TaskID)))

 

also , this formula:-

ClearCollect(relatedtasks,Filter(PeopleWork,People.Email=User().Email));

will not work, as the user might have more than 2,000 relatedtasks items, they can be in 100-150 tasks.. and seems inside power apps we can not get unique TaskIDs from the source... so not sure what can be done to fix this scenario?

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