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Using CountRows to identify a collection entry and prevent duplicates

 Hello, Super smart people

 

I am struggling with using CountRows()+1 when adding data to a collection. I have the function working correctly in that I can create multiple records in the collection, but if I delete an earlier entry and add a new one, I end up getting a duplicate ID number, (see code below) trying to ensure a unique ReportID value is maintained for each record (regardless of their order of creation). 

Collect(colUnsavedRecords,{ReportID:CountRows(colUnsavedRecords)+1,ReportDate:DatePicker1.SelectedDate,Time:Now()

 Here are the 3 sequential entries: 

countrows1.PNG

And here is after I deleted the second entry and added another new record. 

  countrowsissue.PNG

Haven't had much luck using an If statement, or assigning the ReportID to a variable.. 

 

Any thoughts?

 

Thank you in advance! 

 

LeeB

1 ACCEPTED SOLUTION

Accepted Solutions

Hi @LeeB_CDN ,

 

{ReportID: varReportID+1}.. you don't need anything else

View solution in original post

26 REPLIES 26
PTBBSolutions
Solution Supplier
Solution Supplier

@LeeB_CDN 

 

When you remove a record from the collection, the countrows of the collection = 2. 2+1 = 3 - it does exactly what you are telling it to do. I would suggest to create a variable counter e.g. Set(Var_Number,0) on app start for example and instead of using countrows +1, use Var_Number+1.

 

Let me know if you need more detailed explanation.


If this solved you problem, please accept it as a solution.

Yes, that makes total sense... The issue I foresee with using a global variable for this, is the potential for a duplicate record if the app is closed and restarts, whereby Var_Number, will be zero again and just start adding duplicate records? 

I'm saying this because I am storing collections into a local file to be recalled at a later date and completed... With the potential for the app to be closed and reopened. 

PTBBSolutions
Solution Supplier
Solution Supplier

OK then, on app start create a variable based on the max ID currently available (I am not sure how you understand if a session has ended in a happy path or it encountered an issue). After that apply the same logic => Variable + 1

This is intriguing! Tell me more... Do you have a syntax example to illustrate? There would never be more than say 25 "incomplete" records in the local device at any time... so 25 cold be the max ID.

PTBBSolutions
Solution Supplier
Solution Supplier

Where do you store your collection results for the moment? Meaning, if the app restarts (or something like that), where is the collection results stored?

SaveData(colUnsavedRecords,"localUnsavedRecords");
PTBBSolutions
Solution Supplier
Solution Supplier

Set(Var_Number,Max(LoadData(colUnsavedRecords,"localUnsavedRecords")).ID) - this way you will retrieve the max ID from your already stored collection and continue from there.

That is genius PTTBSolutions! I am going to implement and test right now... 

PTBBSolutions
Solution Supplier
Solution Supplier

@LeeB_CDN 

 

Please accept it as a solution if it works for you 🙂

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