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arpost
Advocate V
Advocate V

HELP! Anyone know how to filter a collection but also show the first record value that matches a filter?

Greetings, all! Really hope someone can help with this as I've been going round in circles.

 

I need to create a collection that filters a collection to show specific records but also shows the longest text value for items with the same ID in the original collection. It's probably easier with an example.

 

Here's the collection I'm starting with named Data:

ItemflagFieldPositionLength
Category118
ABC013
DEF Corporation0115
Subcategory1211
HI022

 

Here's the new collection I want to create called TableFields:

FieldPositionMaxLengthText
Category1DEF Corporation
Subcategory2Subcategory

 

I currently get close to this by doing the following:

 

  ClearCollect(
            TableHeaders,
                Filter(
                    Data,
                    flagField = 1
));

 

 I thought I could get the record with the greatest length this way but without success:

 

  ClearCollect(
            TableFields,
                AddColumns(Filter(
                    Data,
                    flagField= 1
                ),"MaxLengthRecord",FirstN(Sort(Filter(Data, flagField>0 && Position=Position),"Length",Descending),1)
            ));

 

 Anyone have any ideas?

7 REPLIES 7
AJ_Z
Super User
Super User

put this in a button and add a gallery with the datasource TableFields.
:

Clear(TableFields);ClearCollect(TableHeaders,Filter(
AddColumns(Data,"MaxLengthText",""),
flagField = 1
)); ForAll(TableHeaders As TfTest, Collect(TableFields,{MaxLengthText:First(Sort(Filter(Data,Position = TfTest.Position),Length,Descending)).Item,Field:TfTest.Item,Position:TfTest.Position}))

 



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AJ_Z
Super User
Super User

Let me know what happens when you do that

 



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AJ_Z
Super User
Super User

I was able to mimic your case and create a solution this way

AJ_Z_0-1639505789412.png

 



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@arpost 

Using your provided data, the following formula in a Gallery Items property would give you what you want:

ForAll(
    GroupBy(Data, "Position", "_data") As _items,
    {Field: First(_items._data).Item,
     Postion: _items.Position,
     MaxLengthText: LookUp(_items._data, Length= Max(_items._data, Length), Item)
    }
)

If there is a specific reason you need an in-memory database Collection, then your formula would be:

ClearCollect(TableFields,
  ForAll(
    GroupBy(Data, "Position", "_data") As _items,
    {Field: First(_items._data).Item,
     Postion: _items.Position,
     MaxLengthText: LookUp(_items._data, Length= Max(_items._data, Length), Item)
    }
  )
)

 

Keep in mind that ForAll is NOT a ForLoop development function, it is a function that returns a Table of records based on your parameters.  The above provides the three columns you specified in the data sample.

 

I hope this is helpful for you.

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Thanks for the replies, @AJ_Z and @RandyHayes. I'm thinking I'll still need to capture this in a collection as I need to reference the collected data in other ways in my app. @RandyHayes, I'll give the second technique you shared a try when I have a chance.

More than happy to help did my solution help?



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@arpost 

If you are using the formula to populate a Gallery...then you already have all the values for anywhere in your app.  You can reference the Gallery.AllItems property from wherever you want and it will have the work already done for you.

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