Question

It’s confusing to categorize something into a model, and others into services. Is their any good thumb rule, help of which i may distinguish between a service and a model. I tried to look into various mvc docs, but almost all of them talk about model-view-and controller. Nothing about services.

Thanks

Answer 1

I would advise you to take a look at Robotlegs.

It is an ActionScript MVC(S) framework that promotes looser coupling between components, and has hooks to handle models and services accordingly.
Rules of thumb to distinguish whether to use a Service or a Model are described thoroughly in the documentation.

In short, a Service would be used to connect your application to the outside world, thus bringing external state into your application.
Whereas a Model would be used to store internal application state.

Robotlegs also features a handy IOC container.

You will be able to either implement your application with this framework or you could get a lot of ideas from looking at the framework code.

Check these out:
http://www.robotlegs.org/
http://www.robotlegs.org/diagram/