Validate at the Boundary You Control

Thu, 01 Mar 2018 00:00:00 +0000

A booking request contains a recipient email and a phone number made entirely of spaces.

For one delivery service, email is enough. For the same service with a particular handoff option, a phone number is mandatory. For another service, phone is always mandatory.

So is the phone optional? That question is already too vague. There is no honest global rule such as “phone is nullable” or “phone is required.” The answer depends on the operation the request asks the system to perform.

Boundaries on Brian Faust

Validate at the Boundary You Control