topic Re: Arcade expression question in Developers Questions

Arcade expression question

Aнастасия88 — Mon, 08 Nov 2021 04:57:12 GMT

Hello people, I came across an error, "The evaluation of attribute rules is cyclic or exceeds maximum cascading level." during editing a feature with an attribute rule made by arcade expression.

As I am new to Arcade, I referenced a sample expression from github to set up the rules that divides a line into two features. The original code works fine that uses a point feature to divide a line at the intersection with the line feature. But I used a start point of a line feature instead of a point feature for my purpose. After I made the simple change in the code, edit works sometimes but get above error sometime randomly. For example, even if I get the error, if I change a place to draw a line feature, then it works without the error.

I have been searching any clue regarding this error but have not had any luck yet. Any help would be much appreciated. Thanks in advance!

Re: Arcade expression question

JohannesLindner — Mon, 08 Nov 2021 06:10:44 GMT

We'd gladly help you, but we need to see the actual code you used for that. Please post that:

Re: Arcade expression question

JohannesLindner — Tue, 09 Nov 2021 06:28:49 GMT

Problem is probably in line 43:

var intersecting_lines = Intersects(line_fs, start_point);

What this code does (in a very general way) is this:

get the lines that intersect the start point of $feature
request edits to be made on those lines
1. for each of those lines, goto 1

But intersecting the start point of $feature with the lines also finds $feature, so you're editing $feature and request edits to be made to $feature and it just cycles endlessly (or it would, but ArcGIS stops it).

Try adding this after line 43:

var gid = $feature.GlobalID intersecting_lines = Filter(intersecting_lines, "GlobalID <> @gid"))

This will remove $feature from the edited lines.

Re: Arcade expression question

Aнастасия88 — Wed, 10 Nov 2021 21:01:18 GMT

Thanks a lot for your help!

But unfortunately, I still got a same error after I added the given code like below.

var start_point = Geometry($feature).paths[0][0] var intersecting_lines = Intersects(line_fs, start_point); var gid = $feature.GlobalID intersecting_lines = Filter(intersecting_lines, "GlobalID <> @gid")