From: Pat Maddox <pergesu@...>
Date: 2006-05-16T17:27:12+09:00
Subject: Re: Weird class-loading issue (or maybe a problem with define_method?)

On 5/15/06, Austin Ziegler <halostatue@gmail.com> wrote:
> I think you're going to need to be a bit clearer about what you're
> *actually* trying to do, because this sounds like an incredibly bad
> design.
>
> Circular dependencies are bad.

I went through Ch1 of Refactoring, using rspec to write the tests.
After I was done with all the refactorings, I wanted to be able to
specify a price code for each Price class by calling a class method,
rather than defining one.  I've got all the source code at
http://svn.flpr.org/public/refactoringbdd  It's very small, so it
wouldn't take more than a few minutes to look at.

Here's the original code for one class, with extraneous methods ripped out:

class ChildrensPrice < Price
  def get_price_code
    Movie::CHILDRENS
  end
end

Here's what I'd like to do:
class Price
  def self.price(val)
    define_method(:get_price_code) { val }
  end
end

class ChildrensPrice < Price
  price Movie::CHILDRENS
end

As you can see, instead of defining get_price_code, I just call
Class.price and it defines the method for me.

Currently the test suite runs fine.  If you open
specs/customer_spec.rb and delete the require "price" line though, it
gives errors.

Pat