From: Trans <transfire@...>
Date: 2007-07-27T04:18:44+09:00
Subject: Re: Modeling -- how to support multiple views of same components?



On Jul 26, 10:55 am, Robert Klemme <shortcut...@googlemail.com> wrote:

> Can you disclose more detail?

Sure. It's for configuration information. On the one hand, I want to
be able to read package settings from a file that is strictly
dedicated to packaging. So, for instance my project might have
a .package file that has basically:

  project: foo
  version: 1.1
  dependencies: [ facets ]
  formats: [zip, tgz, gem]

However, I also want to support an uber-project configuration file,
that would look like:

  project: foo
  version: 1.1
  package:
    dependencies: [ facets ]
    formats: [zip, tgz, gem]

So I have two slightly different formats that I want to support with
strict classes. Eg. in the first case:

  pkg = Package.load(file)
  pkg.project #=> 'foo'
  pkg.formats #=> ['zip','tgz','gem']

and in the other:

  pkg = Project.load(file)
  pkg.project #=> 'foo'
  pkg.package.formats #=> ['zip','tgz','gem']

So, the same info, but organized in the two different manners, as I
described in the original post.

Note, by "strict class" I mean I'm not just keying off a YAML-loaded
hash. I need a class b/c various attributes have default values,
validation and formating applied, plus supporting methods.

T.