PHP Objects, Patterns, and Practice, Third Edition

CHAPTER 13 ■ DATABASE PATTERNS

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methods here, or you could build an observer relationship between the ObjectWatcher and your

createObject() methods. I’ll leave the details up to you. Just remember, it’s up to you to prevent clones

of your domain objects running amok in your system!

Consequences

The Domain Object Factory decouples database row data from object field data. You can perform any

number of adjustments within the createObject() method. This process is transparent to the client,

whose responsibility it is to provide the raw data.

By snapping this functionality away from the Mapper class, it becomes available to other

components. Here’s an altered Collection implementation, for example:

namespace woo\mapper;

// ...

abstract class ...