Can a flow produce an error message like a validation rule?

Question

I am working on a requirement to check the Lead/Contact email address, against the email address on a separate custom object named "Do not call Log'. For example, if the email address of [email protected] exists in the email field, on the "Do not call Log" object a user should not be able to create a new Lead/Contact with that same email address. The user should get an error message stating that 'Email address already exists…" I was thinking of creating a flow to run a loop over the "Do not call log" object to check if that email already exists, however, I can't determine a way to get a message to the user upon trying to save the lead/Contact record.   Does anyone have any suggestions or thoughts? Should this be done via Apex?

Answer 1

You cannot add errors to records with flow. You can use an Apex trigger and the SObject.addError method to add an error message and prevent the DML from occurring.