Formula properties

A formula property computes its value instead of storing a manually edited result. Use formulas for repeatable derivations such as totals, labels, or date calculations that should update with their inputs.

Add a formula

1. Open Object type settings → Properties.
2. Add or open the output property.
3. Configure its formula expression using properties available in the Type’s effective schema.
4. Test the result on representative Objects, including empty and unexpected input values.

Formula properties are read-only on Object pages. The stored value for that property is ignored while a formula is configured.

Design formulas safely

• Use stable property names and review aliases after schema renames.
• Keep calculations small and deterministic.
• Decide how missing values should behave before relying on the result in a query.
• Match the output property’s value type to the expression’s result.

Formulas are evaluated by Lar’s purpose-built expression parser; they are not JavaScript and cannot execute arbitrary code.

Formula property versus workflow transform

A formula property is always derived when an Object is read. A workflow formula action computes a value during one automation run and can pass that output to later workflow nodes. Use the property when the value belongs permanently in the schema; use a workflow transform for run-specific data flow.

Next: Aliases.