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Rob Allen:
Objects in the model layer
March 22, 2013 @ 10:45:54

In this latest post to his site Rob Allen talks some about application structure and the different kinds of objects he uses in his applications.

I currently use a very simple set of core objects within my model layer: entities, mappers and service objects. [...] I dislike the phrase "service object" as the word "service" means so many things to so many people. I haven't heard a better phrase yet that everyone understands though.

He defines each of the types of objects to help make the separation clearer. Here they are in brief:

  • Entities are objects that represent something in my business logic.
  • Mappers know how to save and load an entity from the data store.
  • Service objects provide the API that the rest of the application uses.

Some of the comments on the post relate his choices to use in Zend Framework v2-based applications, noting that there are some base components you can extend to create these kinds of objects.

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