Arcade and attribut rules

leonoestergaard — Wed, 25 Mar 2020 13:08:33 GMT

Hi Im trying to create my first attribut rule. Im using ArcGis Pro 2.5

When validating the following code

var area= FeatureSetByName($datastore,"TestArea")
var fs = Contains(area,$feature)
var res = First(fs)

It fails with this message

Invalid expression
Error on line 3.
General evaluation error

If i Change First to Count, i do not get a validation error. Why can i not use first?

Re: Arcade and attribut rules

JoeBorgione — Wed, 25 Mar 2020 13:25:58 GMT

I too have just entered into the Arcade/Attribute rules arena, and claim no expertise at all, but in Chasing my tail with Arcade/Attribute Rules Jake Skinner‌ provides a solution for me. I just wonder of the 'optional' arguments to the function aren't so optional. Data Functions | ArcGIS for Developers