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Arcade - generating unique IDs for new and existing polygons

lmott

I need help with creating a system for generating unique IDs for a layer. Most of the features already have unique IDs in a large numeric range, and all of them begin with the letter "P" (e.g., P10057). This setup was done prior to me. I need to keep it the same as the layer is tied to a related table(s) with that ID.

What I'm looking for is a solution that will automatically generate a unique ID for each new feature created, ensuring that the ID is not already in use. Additionally, I have about 12 existing polygons that were created without IDs, and I need help assigning unique IDs to those as well.

Any help is appreciated, thanks!

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lmott

Yes, arcade.

RPGIS

Hi @Laura

You simply added the feature value. Delete '$feature.' and it should work.

I also forgot to include this in the script.

    id = Number( Left( id , Count( id ) - 1 ) )

Did you select arcade as the calculation method?

lmott

Am I not filling something in here?

RPGIS

Hi @Laura

So the only way to do this, because you are using alpha numeric values instead of numerical values, is you would need to loop through the entire feature set, removing the p from each value to get the number, and then populate a list of numbers and only returning the maximum number. From there you would simply add 1 to the max and return that number as the new id.

var fs = $featureset

var Numbers = []
for( var row in fs ){
    var id = row['<insert id field name>']
    id = Left( id , Count( id ) - 1 )
    Push( Numbers , id )
    }
var N = Max( Numbers ) + 1
return 'P'+Text( N )

It is typically recommended to use numerical values for ids unless there isn't another option or because it is used because of some other application/dataset.

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