Rails - Jul 2007 - Strange Migration Behaviour

Hi! I''m getting this strange migration error for this migration:

class CreateCustomers < ActiveRecord::Migration
  def self.up
    Customer.create :name => ''TEST'', :zone_id => 0
  end

  def self.down
    Customer.delete_all
  end
end

Produces:

== CreateCustomers: migrating
================================================--
create({:name=>"TEST", :zone_id=>0})
rake aborted!
undefined method `create'' for
#<ActiveRecord::ConnectionAdapters::MysqlAdapter:0x46c2204>

I "fixed" it by defining the customer model inside the migration. Why
is
happening this? (the same kind of migrations are working for all my
models except "Customer")

class CreateCustomers < ActiveRecord::Migration
  class Customer < ActiveRecord::Base
  end

  def self.up
    Customer.create :name => ''TEST'', :zone_id => 0
  end

  def self.down
    Customer.delete_all
  end
end

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Perhaps a little "obvious", but 
"eval(File.read(''app/models/customer.rb''))" also
works fine.

class CreateCustomers < ActiveRecord::Migration
  # Improvised fix. Why?
  eval(File.read(''app/models/customer.rb''))

  def self.up
    Customer.create :name => ''TEST'', :zone_id => 0
  end

  def self.down
    Customer.delete_all
  end
end

I think thisis related:
http://wiki.rubyonrails.org/rails/pages/TipsAndTricks, Adding Data to 
Migrations

I still don''t know why! :(

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