No Validation for Invalid Field API Name

[ethandunzer]

The method getFirstValue retrieves a field value using firstRecord.get(req.fieldApiName). If the provided fieldApiName is invalid (does not exist on the SObject), this will silently return null. There is no validation or error handling for invalid field names, which could lead to confusion or missed errors.

Suggested Fix

• Add validation to check if the field exists on the SObject before attempting to retrieve its value.
• Optionally, return an error message or throw an exception for invalid field names.