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PHPMaster.com:
Building a Domain Model - An Introduction to Persistence Agnosticism
February 27, 2012 @ 12:58:00

On PHPMaster.com there's a recent tutorial introducing the concept of a "domain model" and showing how to create them in PHP (manually, not inside of any ORM or database solution).

First off, creating a rich Domain Model, where multiple domain objects with well-defined constraints and rules interact, can be a daunting task. Second, not only is it necessary to define from top to bottom the model itself, but it's also necessary to implement from scratch or reuse a mapping layer in order to move data back and forward between the persistence layer and the model in question.

They include an example of a set of domain models tat relate to one another - a blog setup with posts, comments and users. They show how to create the AbstractEntity to handle a bit of the magic behind the scenes, an example "Post" and "Comment" models and how they can be put to work creating some posts and appending comments. A little bit of markup is included to output the results.

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