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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
RandyHayes
Super User
Super User

@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
RandyHayes
Super User
Super User

@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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NOTE: My normal response times will be Mon to Fri from 1 PM to 10 PM UTC (and lots of other times too!)
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Really want to show your appreciation? Buy Me A Cup Of Coffee!

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
    )
);;

 

 

RandyHayes
Super User
Super User

@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

 

RandyHayes
Super User
Super User

@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!

RandyHayes
Super User
Super User

@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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