Validating the value
The key-value coding protocol defines methods for validating properties by key or key path.The default implementation of these methods in turn rely on you to define methods following naming patterns similar to those used for accessor methods. If you don’t supply a validation method for a property, the default implementation of the protocol assumes validation succeeds for that property, regardless of the value.
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Before we dig into more details, let's talk about how validations fit into the big picture of your application.
Validations are used to ensure that only valid data is saved into your database.
Those of us working in digital enjoy the luxury of being able to quickly adapt to the marketplace and our customers after a product launches – in fact, we often say “the market is the only test” and count on post launch feedback to refine the Minimum Viable Product and continue to build the user experience.
This approach works for digital, but as we see more products where the physical and digital experience are tightly coupled into a single value proposition, a different approach is required.
During an audit at GAF, the UL auditor discovered the company was being inadvertently double-billed for some waste-hauling services.
The mistake was discovered by reconciling waste volumes with billing invoices during the audit.Others have discovered savings by using audit results to demonstrate that the size or number of trash compactors or bailers can be reduced as a result of declining waste volumes.Many companies launch a zero waste or waste minimization effort with great fanfare, but over time management and employee focus shifts to other issues. Data reliability, cost, and time investment will vary from one test to another.What are the risks and benefits of speaking with customers versus making them do something?They are database agnostic, cannot be bypassed by end users, and are convenient to test and maintain.