Attribute Rule Calculation

Since version: 1.5

With the Attribute Rule Calculation profile, expressions can be written to update field values based on expression logic. This profile is used for calculation attribute rules tools in ArcGIS Pro. When the attribute rule is evaluated for a dataset, the return value for the expression is cast to the field type of the output value. It is best practice to handle casting within the script for full control of casting behavior to Number, Date, or Text return types.

Context

The following products implement this profile:

Spatial reference

The spatial reference of the expression's data source¹ determines the execution context's spatial reference.

Time zone

The time zone of the expression's data source¹ determines the execution context's default time zone.

Profile variables

Variable Name	Type	Description	Since version
$datastore	FeatureSetCollection	A collection of layers in the same feature service or database as the `$feature` executing the script.	1.5
$editcontext.editType	Text	Indicates whether the edit event is `INSERT`, `UPDATE`, `DELETE`, or `NA` (not applicable).	1.10
$feature	Feature	The feature being calculated.	1.5
$originalFeature	Feature	The previous state of the feature being calculated.	1.9
$featureSet	FeatureSet	A collection of features in the same table as the `$feature` evaluating the expression.	1.13

Function bundles

Core | Geometry | Data Access | Database

Return types

For a list of valid dictionary keywords, click here.

Example

The following expression demonstrates how to generate a unique id for each feature, if not already set.

Use dark colors for code blocksCopy
//Define the leading text, the trailing text and the delimiter for the ID
prefix = "ABC"
join_char = "-"
suffix = "XYZ"

//Ensure the ID is not already set, if it is, return the original id
if (IsEmpty($feature.assetid)) {
   // If you do not want to use a prefix, or suffix, remove it from the list
   return Concatenate([prefix, NextSequenceValue("GDB_SEQUENCE_NAME"), suffix], join_char)
}
else {
   return $feature.assetid
}

Data source can be a file geodatabase, mobile geodatabase, or mobile service.