Dump the data of ActiveRecord::Base based models to .yml files in the Rails db directory.

dump_models_to_files.rb

require 'active_record'

# 
# When run from the root directory of a Rails project, this code will dump the data
# of all models inheriting from ActiveRecord. The data is dumped to .yml files in the
# db directory of the Rails app.
# 
# This code is not very fast, as it starts up Rake for each model. It could use improvement.
# 
# ------ Dependency on ar_fixtures -------
# 
# This code assumes the Rails app has ar_fixtures ( https://github.com/topfunky/ar_fixtures ) 
# installed as a plugin. 
# 
# ar_fixtures is not actively maintained and is not Rails 3.x. However, making it Rails 3.x is quite painless.
# Simply replace 'RAILS_ROOT' with '::Rails.root.to_s' throughout all of the plugin files 
# and it then works as expected.
# 
# 
# Usage:  '$ ruby dump_models_to_files.rb'
# 
# 

Dir.foreach("./app/models/") do |f|
  if f.end_with?(".rb")

    full_name = "./app/models/#{f}"
    require(full_name)
    class_name = f.sub(/.rb/,"").camelcase
    klass = Module.const_get(class_name) 

    if klass.superclass == ActiveRecord::Base
      cmd = "rake db:data:dump MODEL=#{class_name}"
      x = system(cmd)
    end
   end
end