topic Re: Pro arcade expression attribute rule in ArcGIS Pro Questions

Pro arcade expression attribute rule

2Quiker — Tue, 25 Feb 2025 17:47:41 GMT

I am trying to create an attribute rule that will allow me to create a point and take the attributes from a polygon and transfer them to the point when the point is created, if it's possible. in the attribute rules i get, Error002717: invalid arcade expression, Arcade error: Unexpected null

My attribute rule

// Read the polygon layer var poly = FeatureSetByName($datastore, "polygons"); // Find intersecting polygon var int = Intersects(poly, $feature); // Check if there is an intersection if (Count(int) > 0) { // Get the first intersecting polygon's ParcelID value var firstPoly = First(int); return firstPoly.ParcelID; } else { // If there's no intersection, retain the existing ParcelID value return firstPoly.ParcelID; }

Re: Pro arcade expression attribute rule

AlfredBaldenweck — Tue, 25 Feb 2025 15:40:20 GMT

Try something like this instead?

var poly = FeatureSetByName($datastore, "pol") for (var py in poly){ if (Intersects(py, $feature)){ return py.GlobalID } }

I don't think you need to specify an Else here.

Re: Pro arcade expression attribute rule

KenBuja — Tue, 25 Feb 2025 16:29:59 GMT

Your else statement runs when there are no intersecting polygons, which is why getting the ParcelID from a null value throws an error. Where is the existing account value coming from?

Re: Pro arcade expression attribute rule

2Quiker — Tue, 25 Feb 2025 19:31:42 GMT

Using what you posted, I didn't get an error. I have both the polygon and point layer added to my map, when start editing and create the point, the point is created but the ParcelID field is not populated in the point layer. The attribute rule is setup with the following settings, immediate calculation, Field - ParcelID, triggers - both insert & Update.

Re: Pro arcade expression attribute rule

2Quiker — Tue, 25 Feb 2025 19:58:22 GMT

account was a typeo, it's should be ParcelID.