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firektl
Helper III
Helper III

Counter in a ForAll

Hello Community,

 

My question is the following:

 

I have a collection where I keep the attendance of the students.

 

This collection is uploaded to a gallery.

 

For items in the gallery, I create a temporary collection with the attendance of a student.

 

My collection is called colTemporal and it has this data:

 

Attendance | LessonDate

   Present       2 November 2020.
   Absent        6 November 2020.
   Absent        13 November 2020.
   Absent        09 January  2021.

 

I need to evaluate when the attendance is absent as long as it is consecutive, that is, the assists from 

 

6 November 2020

13 November 2020

09 January  2021

 

According to my logic, I only have to go through the collection and for each iteration ask if the assistance is ABSENT, when this condition is met, I need a way to create a counter, if the condition is false, I have to initialize that counter, well the attendance cycle is broken as ABSENT.

 

The problem is that when trying to create a set inside the ForAll it sends an error, it is not allowed.

1 ACCEPTED SOLUTION

Accepted Solutions

@firektl 

Thanks for the explanation. Much clearer.

 

So here is a solution for you set a label in your Gallery and set the Text property to the following:

With({attendance:Filter(collectAttendanceStudent; StudentEmailId=ThisItem.StudentEmailId)},
    Sum(
        ForAll(Sequence(CountRows(attendance)), 
            With({thisRec:Last(FirstN(attendance, Value)).Estatus,
                  preStat:Coalesce(Last(FirstN(attendance, Value-1)).Estatus, "")}, 
                If(thisRec="Absent" && preStat="Absent", 1, 0)
            )
        ), 
        Value
    ) > 0
)

The label will show true if there is any consecutive absent markings and false if not.

i.e.  If a student has ABSENT attendance in classes 1, 2 and 3 - it will show true.

       If ABSENT attendance in classes 1, 4, 6 - it will show false

 

You can use that formula in whatever you need.

 

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View solution in original post

7 REPLIES 7

@firektl 

ForAll is not really a For Loop like you might be thinking.  It is often used that way, but overused for such.

It is intended to iterate through a series of records in a Table and to RETURN a table of records.

 

What you appear to be wanting to do is count the conditions where the Attendance is Absent.

In this case I would lean toward the CountRows for this:

CountRows(yourCollection, Attendance="Absent")

 

If this is not what you are looking for, then clarify please - perhaps share your current formula you are having issues with.

 

I hope this is helpful for you.

_____________________________________________________________________________________
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Hi @RandyHayes 

 

Thank you very much for your answer.

 

I will explain the scenario with an example.

 

A course has 6 classes (6 meetings that I must attend)

 

Class 1 of the course is 10/10/2020

Class 2 of the course is on 10/14/2020

Class 3 of the course is 10/17/2020

Class 4 of the course is on 10/19/2020

Class 5 of the course is 10/21/2020

Class 6 of the course is 10/25/2020

 

If a student has ABSENT attendance in classes 1, 2 and 3 I must count it, but if he has ABSENT attendance in classes 1, 4, 6 I do not count it, since having ABSENT attendance in a CONSECUTIVE way is an indicator that I must evaluate.

 

In my collection I have the attendance list ordered by date, so I try to cycle to ask for attendance.

I hope I have explained myself well.

 

Clear(colTemporal);;
ForAll(
    Filter(collectAttendanceStudent; StudentEmailId = ThisItem.StudentEmailId);
    Collect(
        colTemporal;
        {
            LessonDate: LessonDate;
            Attendance: Attendance;
            Estatus: Estatus
        }
    )
);;

ClearCollect(colTemporal; SortByColumns(colTemporal;"LessonDate"));;

ForAll(
    colTemporal;
    If(ThisRecord.Attendance = "Absent"
    ;
        Notify("Absent") // count++
    ;
        Notify("Present") // count = 0
    )
);;

 

 

@firektl 

Thanks for the explanation. Much clearer.

 

So here is a solution for you set a label in your Gallery and set the Text property to the following:

With({attendance:Filter(collectAttendanceStudent; StudentEmailId=ThisItem.StudentEmailId)},
    Sum(
        ForAll(Sequence(CountRows(attendance)), 
            With({thisRec:Last(FirstN(attendance, Value)).Estatus,
                  preStat:Coalesce(Last(FirstN(attendance, Value-1)).Estatus, "")}, 
                If(thisRec="Absent" && preStat="Absent", 1, 0)
            )
        ), 
        Value
    ) > 0
)

The label will show true if there is any consecutive absent markings and false if not.

i.e.  If a student has ABSENT attendance in classes 1, 2 and 3 - it will show true.

       If ABSENT attendance in classes 1, 4, 6 - it will show false

 

You can use that formula in whatever you need.

 

_____________________________________________________________________________________
Digging it? - Click on the Thumbs Up below. Solved your problem? - Click on Accept as Solution below. Others seeking the same answers will be happy you did.
NOTE: My normal response times will be Mon to Fri from 1 PM to 10 PM UTC (and lots of other times too!)
Check out my PowerApps Videos too! And, follow me on Twitter @RandyHayes

Really want to show your appreciation? Buy Me A Cup Of Coffee!
firektl
Helper III
Helper III

Hi @RandyHayes 

 

 With(  {attendance:Filter(collectAttendanceStudent; StudentEmailId=ThisItem.StudentEmailId)};
    Sum(
        ForAll(  Sequence(  CountRows(attendance)); 

            With(  { thisRec:Last(FirstN(attendance; Value)).Attendance;

                     preStat:Coalesce(Last(FirstN(attendance; Value-1)).Attendance ; "") }; 

                If( thisRec="Absent" && preStat="Absent"; 1; 0)
            )
        ); 
        Value
    ) >= 3
)

 

Make a change for it to work.

Thank you very much, it is possible that you can help me with another problem, I raised it.

 

Really very grateful! You are a sun

 

@firektl 

Sorry I forgot to convert to semicolons for your language.

Glad it worked - pretty simple formula eh?  😁

 

Let me know what other problem you posted and I can take a look.

 

_____________________________________________________________________________________
Digging it? - Click on the Thumbs Up below. Solved your problem? - Click on Accept as Solution below. Others seeking the same answers will be happy you did.
NOTE: My normal response times will be Mon to Fri from 1 PM to 10 PM UTC (and lots of other times too!)
Check out my PowerApps Videos too! And, follow me on Twitter @RandyHayes

Really want to show your appreciation? Buy Me A Cup Of Coffee!
firektl
Helper III
Helper III

@RandyHayes 

 

It's another level, I'm just starting out and I don't know much about the functions and how to combine them. In fact, your solution is not 100% complete, but it helped me a lot.

 

And yes, I am from Venezuela and if you don't understand what I write it is for the translator, sorry for that.

I raised the other problem in the community but there was no solution, I'll leave you the url

 

Gallery with date columns 


Thank you very much, again!

@firektl 

No worries.  Happy to help. 

I have brought your other post up and will review it to see what I can offer.  I'm ending the day here, so it will most likely be sometime over the weekend.

_____________________________________________________________________________________
Digging it? - Click on the Thumbs Up below. Solved your problem? - Click on Accept as Solution below. Others seeking the same answers will be happy you did.
NOTE: My normal response times will be Mon to Fri from 1 PM to 10 PM UTC (and lots of other times too!)
Check out my PowerApps Videos too! And, follow me on Twitter @RandyHayes

Really want to show your appreciation? Buy Me A Cup Of Coffee!

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