Rails - May 2007 - Using ActiveResource to copy models with the same class?

I''d like to be able to copy model objects from one site instance of 
my rails application to another and I''m wondering if I can use or 
adapt ActiveRecord for this purpose.

The problem I have at the start is that the models have the same 
classname on both sites.

So while this works great in script/console running on railsapp1.domain.com:

   class Activity < ActiveResource::Base
     self.site = "http://railsapp2.domain.com"
   end

   activities = Activity.find(:all)

It''s not clear how I now get access to the local ActiveRecord class 
called Activity on the running rails instance railsapp1.domain.com.

Has anybody tried doing this?

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>I''d like to be able to copy model objects from one site instance of
>my rails application to another and I''m wondering if I can use or
>adapt ActiveRecord for this purpose.
I figured it out and I thought other people might like to know.

I''m using edge rails (rev 6786) checked out with Piston.

The following was all done in script/console.

First I put my ActiveResource classes in a Module so there wouldn''t be
any name space clash with the identically named existing local ActiveRecord
classes:

  module Remote
    class RemoteDiy < ActiveResource::Base
      self.site = "http://railsapp2.domain.com/"
    end
    class Level < RemoteDiy; end
    class Subject < RemoteDiy; end
    class Unit < RemoteDiy; end
  end

Then I just got the complete collections of levels, subjects, and units using a
syntax identical to ActiveRecord:

  levels = Remote::Level.find(:all); puts "copied: #{levels.length}"
  subjects = Remote::Subject.find(:all); puts "copied:
#{subjects.length}"
  units = Remote::Unit.find(:all); puts "copied: #{units.length}"

Finally I created local ActiveRecord objects with attributes of each remote
object.

  levels.each { |l| Level.create(l.attributes) unless
Level.find_by_name(l.attributes[''name'']) }; nil
  subjects.each { |s| Subject.create(s.attributes) unless
Subject.find_by_name(s.attributes[''name'']) }; nil
  units.each { |u| Unit.create(u.attributes) unless
Unit.find_by_name(u.attributes[''name'']) }; nil

Done! I like it!

I did this because I wanted to synch my development environment with copies of
data from the production application.

Now I need to learn more about how to use ActiveResource to create associations
and their attributes. Any pointers to working code would be greatly appreciated.
--
- Stephen Bannasch
  Concord Consortium, http://www.concord.org

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