topic Re: Constraint rule field length in Attribute Rules Questions

Constraint rule field length

V1212 — Thu, 26 May 2022 16:27:28 GMT

Hi, I created a constraint that checks if an editor has entered a valid number into a field (length of 12).

var length = Count(Text($feature.name_id));

if ((($feature.name_id!=$originalfeature.name_id) && (length!=12))

{return false}

else

{return true}

I want to modify this rule so that an editor can remove an incorrect 12 char text from the field without the rule getting triggered. I've tried different variations of this expression but it doesn't work as intended. I get an error message when I try to blank the field.

var length = Count(Text($feature.name_id));

if (($feature.name_id!=$originalfeature.name_id) && ((length!=12) || IsEmpty(length)))

{return false}

else

{return true}

Thanks in advance!

Re: Constraint rule field length

JohannesLindner — Mon, 30 May 2022 05:50:38 GMT

It's probably because you're checking length for null, not name_id.

As a side note: just use multiple if statements. Your statement is hard to read and understand because of all the parantheses in there, and the $feature stuff doesn't help...

var name_id = $feature.name_id var o_name_id = $originalfeature.name_id if(name_id == o_name_id) { // you're not changing it return true } if(IsEmpty(name_id)) { // it's blank return true } var len = Count(Text(name_id)) return len == 12

Re: Constraint rule field length

V1212 — Mon, 30 May 2022 12:57:46 GMT

Thanks for the help and your tip!