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Referencing Creating Attribute Rules using ArcPy in ArcGIS Pro

Now I am trying to build an expression. First it does not give me the option to choose the type of syntax in the expression builder GUI. (ie. Arcade, Python or SQL)

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Secondly I used this script 

var FID = $tSignalPoles.FID;
if(FID == 0001)
  return "SP-" + NextSequenceValue("tSignalPoles")

But it cannot find feature that I am calling out in the line 1 variable even though that is the correct source name in the database.

enter image description here

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2 Answers 2

Reset to default
1 
var FID = $tSignalPoles.FID;
if(FID == 0001)
  return "SP-" + NextSequenceValue("tSignalPoles")

$tSingalPoles.FID; should be changed to $feature.FID;

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1
  • The expression is valid, but when I go to create new features, a new FID is not created, the field value remains nulls.
    – cheff_
    Jan 30, 2020 at 13:11
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if(isempty($feature.FID)) //If the field is empty or has the default value
return concatenate("SP-" + nextsequencevalue("Traffic_SignalPole_ID")); //calculate a 
new id
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