Ruby script to generate generator commands from existing models

generators_from_models.rb

# RUN THIS FROM WITHIN THE RAILS CONSOLE OF THE APP
# WITH THE MODELS YOU'RE USING AS A TEMPLATE

RAILS_COMMAND = "rails g resource"
RAILS_COMMAND_OPTIONS = "--skip-migration"
FILE_NAME = "resource_generation.rb"

# First, ensure we've loaded all of the model classes
Dir.glob("#{Rails.root}/app/models/*.rb").sort.each { |file| require_dependency file }

models = []
commands_to_run = []

Module.constants.select do |constant_name|
  constant = eval constant_name.to_s
  if not constant.nil? and constant.is_a? Class and constant.superclass == ActiveRecord::Base
    models << constant_name.to_s
  end
end

models.each do |model|
  attributes_string = (eval model).columns_hash.map {|h| "#{h[0]}:#{h[1].type}" }.join(" ")
  command_string = "system('#{RAILS_COMMAND} #{model} #{attributes_string} #{RAILS_COMMAND_OPTIONS}')"
  commands_to_run << command_string
end

File.open(FILE_NAME, 'w') do |file|
  file.puts "#!/usr/bin/env ruby"
  commands_to_run.each do |command_to_run|
    file.puts command_to_run
  end
  file.chmod(0755)
end

Then simply move the command to your new Rails app and run

./resource_generation.rb