Re: application helper problema

alberto
2009-02-07T21:37:48Z

On Feb 7, 1:28 pm, Me <chabg...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> OK, so you can only call functions in a controller that are in a
> model?

You can call methods from pretty much anywhere, but that is not the
point. In Rails, you want to follow their MVC pattern to get the most
of the framework.You want to call methods within the scope of where
you are at.

The browser requests go from Dispatcher -> Controller -> View

The purpose of the controller is to get the request, maybe validate
the user, then instantiate an object that will be rendered in the
view. That''s it. Any logic about the specifics of how to instantiate
the object should be handled by the model classes. So in that part,
you are correct when you say "only call functions in a controller that
are in a model". You are making a call to instantiate an object that
will be used in the view.

The model classes usually have  a database back end but it does not
have to be. It is common to have model classes for specialized reports
for example, that have aggregation methods, etc. So you should create
a model class for what you are trying to do, to separate those methods
in their own domain.

Finally, the purpose of the Helper classes is to provide methods for
the View. When you need to format something, etc. you put call methods
in either the controller_helper class or the generic application
helper class.

Hope that helps.


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