Switching between ActiveRecord and DataMapper - the gory details (https://github.com/datamapper/datamapper.github.com.git)

dm_repository_setup.md

DM's Integrity Map causes issues when setting up tables in legacy repositories. The rails console can access the models, but the controller cannot. The (temporary?) solution is to add the following lines to the models. http://groups.google.com/group/datamapper/browse_thread/thread/16dc095f33097050#

def self.default_repository_name
  :your_repository
end
def self.repository(name = nil, &block) 
  super(:your_repository, &block) 
end

In order to avoid migration in a legacy database (repository :legacy):

# ./spec/spec_helper.rb
config.before(:suite) do
  DataMapper::Model.descendants.entries.each do |model|
    model.auto_migrate!(:default) unless model.default_repository_name == :legacy
  end
end

# call the bellow rake task to upgrade the table that are not in the :legacy repository
# ./lib/tasks/limited_auto_upgrade.rake

task :environment do
  require File.expand_path('../../config/boot', File.dirname(__FILE__))
end

desc "Perform auto_upgrade on the default repository only"
task :limited_auto_upgrade => :environment do
  DataMapper::Model.descendants.entries.reject { |m| m.default_repository_name == :excluded_repository }.each do |model|
    puts "Upgrading #{model.name}"
    model.auto_migrate!(:default)
  end
end

using_ar.markdown

The first comment in the blocks shows the file. The subsequent comments in the same block mean that the line needs to be commented out in the file.

# app/config/application.rb
require "active_record/railtie"
# require "dm-rails/railtie"

# spec/spec_helper.rb
config.fixture_path = "#{::Rails.root}/spec/fixtures"
config.use_transactional_fixtures = true

# config/environments/development.rb
config.action_mailer.raise_delivery_errors = false

# config/environments/production.rb
config.action_mailer.raise_delivery_errors = false

# config/environments/test.rb
config.action_mailer.delivery_method = :test

# controllers/application_controller.rb
# require 'dm-rails/middleware/identity_map'
class ApplicationController < ActionController::Base
  protect_from_forgery
  # use Rails::DataMapper::Middleware::IdentityMap
end

using_dm.markdown

The first comment in the blocks shows the file. The subsequent comments in the same block mean that the line needs to be commented out in the file.

# app/config/application.rb
# require "active_record/railtie"
require "dm-rails/railtie"

# spec/spec_helper.rb
# config.fixture_path = "#{::Rails.root}/spec/fixtures"
# config.use_transactional_fixtures = true

# config/environments/development.rb
# config.action_mailer.raise_delivery_errors = false

# config/environments/production.rb
# config.action_mailer.raise_delivery_errors = false

# config/environment/test.rb
# config.action_mailer.delivery_method = :test

# controllers/application_controller.rb
require 'dm-rails/middleware/identity_map'
class ApplicationController < ActionController::Base
  protect_from_forgery
  use Rails::DataMapper::Middleware::IdentityMap
end