This sort of functionality comes with Rails Engines. Check it out,
it's pretty similar.
-jeff
On 4/3/06, Pete Yandell <[EMAIL PROTECTED]> wrote:
> A lot of the built-in Rails classes have configuration options that
> can be set in environment.rb, but there doesn't seem to be any
> standard way of doing the same thing for your own classes. The
> following are my initial thoughts on solving this, some simple code,
> and a few related questions.
>
> Let's say I have a model called MyModel. In MyModel, I'd like to be
> able to do something like this:
>
> class MyModel
> include Configurable
>
> config_attr :example_attribute, "Here's a default value"
>
> def my_method
> p config.example_attribute
> end
> end
>
> Then, in environment.rb:
>
> MyModel.configure do
> self.example_attribute = "Here's the configured value"
> end
>
> There's code at the end of the e-mail to implement a simple version
> of this.
>
>
> The questions:
>
> 1) How do I work around reloadable classes?
>
> The old Rails approach to adding configuration was:
>
> class MyModel
> @@example_attribute = "Here's a default value"
> cattr_accessor :example_attribute
> end
>
> and in environment.rb:
>
> MyModel.example_attribute = "Here's the configured value"
>
> This dies for model classes because MyModel is trashed and reloaded
> on each request, overwriting the value set in environment.rb with the
> default one after the first request. My code below suffers from the
> same problem.
>
> Anyone got any ideas on neat ways to work around this? I can think of
> a couple of approaches, but they're all really ugly.
>
>
> 2) Would something along these lines be a possibility for inclusion
> in a future version of Rails? I know it's far from being rocket
> science, but with the proliferation of plugins, engines, etc. it
> would be nice to have a standard way that this is done, if only so
> that you know where to look for configuration when using third-party
> code.
>
>
> 3) What do people think of the API approach I've suggested? I'm
> trying to make it as simple as possible, not force you to manually
> define a separate class or module just to hold configuration, but
> still do strict config checking in environment.rb.
>
>
> Cheers,
>
> Pete Yandell
>
>
> module Configurable
> def self.included(base)
> base.class_eval do
> @@config = Class.new unless defined?(@@config)
> cattr_reader :config
> end
>
> base.extend(ClassMethods)
> end
>
> module ClassMethods
> def config_attr(name, value)
> config.cattr_accessor name
> config.send("#{name.to_s}=".to_sym, value)
> end
>
> def configure(&block)
> block.bind(config).call
> end
> end
> end
>
> _______________________________________________
> Rails-core mailing list
> Rails-core@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails-core
>
--
Jeff Lindsay
http://blogrium.com/
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